If you've got a Ford with a fuel-injected V8 engine built between the mid-1980s and mid-1990s, your factory distributor is equipped with Ford's EEC-IV electronic engine control module that's gray in color and mounted directly to the distributor. From managing orders and returns to acting as a sales representative, they go beyond being the middleman between retailers and producers. intake manifold vacuum pressure) and/or a centrifugal advance unit (using springs which move from centrifugal force as the distributor spins more quickly). In business, measurement is half-way to performance improvement. (why wouldn’t the graph start at 10 degrees instead of o degrees? Since their inception at the start of the 20th century, motor vehicles with gasoline burning engines have needed a precise way to deliver an electrical spark to each of the engine's cylinders. Yet limited research has accomplished in this area. We take pride in engineering quality and durable products that we can be happy to bear our family name, but also we can enjoy using for ourselves. The weights pivot on pins that are attached to the distributor shaft, and the center plate is attached to the movable assembly that holds the rotor. Once you’ve set the initial and mechanical timing, and adjusted the curve, you should be very close to the optimum timing curve for wide-open throttle performance. Optimum distributor performance is obtained when the distributor is mounted directly to the expansion valve outlet. Vacuum advance is tricky to tune because there is no direct measurement available like when dealing with total. The slotted arm under the weights controls how much the weights can move, while the springs control how fast the assembly reaches that limit. Performance Machine is the leading manufacturer of motorcycle wheels, brake systems, controls, and accessories. Selling through distributors benefits manufacturers by adding scale, reach, and specialization to their sales efforts. IT distributor: An IT channel distributor is a business that acts as an intermediary between vendors and value-added resellers ( VARs ) or system integrators ( SIs ) in the distribution of software or hardware. There's no need to adjust dwell, and you'll only need to set timing once because it won't change. This moment in time is measured in crankshaft degrees before the piston reaches top dead center (TDC). The easiest way to confirm what port you have is to hook up a vacuum a gauge and check for vacuum at idle. Aftermarket spring kits come with springs of varying tension, and you can mix and match the springs until you get the advance rpm you need. Appreciate your help with this. Whether they are equipped with points or not, all distributors are subject to wear of the bushing(s) that surrounds the main shaft. The Distributor What does it Do: The distributor is found in the ignition system of an internal combustion engine and it is commonly referred to a device that routes the high voltage into the correct firing order to the spark plugs. On race cars, the engine spends very little time at low rpm, so many times the vacuum-advance system is eliminated. fidelityilf.com. We discuss performance distributors with electronic upgrades and other design improvements over OEM. This movement rotates the shaft and plate, thus advancing the timing. All rights reserved. The vacuum advance increases timing as the vacuum created by the engine increases (idle and low-load conditions). When exactly the total advance occurs is of great importance when it comes to performance, and we discuss this in the section about “curving.”. How does it affect performance? For much of the past 100 years, the spark has been delivered by the ignition distributor. This way there is no effect on the initial timing setting. You'll need a distributor that's built to fit your older car and equipped with a hall effect sensor that tracks this necessary information. What base and total timing is best? Trust that Performance Distributors produces a product that will allow you to “feel the power” of your car, truck, hot rod, boat or race car. But, when we increase the engine speed, we will see increasing advance, until the total centrifugal advance is reached, and we would see 34 degrees. Adding heavier weights and retaining the stock advance springs will allow the curve to advance quicker than when using factory weights. Dyno testing has shown that most small blocks running Premium pump gas with 9.0:1 – 9.5:1 compression make peak horsepower with roughly 38-42 degrees of total advance. (Photo Courtesy Tom Dufur) Classic Industries offers this original points-style replacement distributor (PN D1835). Failing distributors can end up in engine problems and eventually, a really harmed performance of your car. Since we all know that the proper timing is one that lights the air/fuel mixture at the ideal point in the cycle to create maximum power, it is safe to assume that there is more to it. Supplier & Distributor Performance Overcome the complexity of the global supply chain to improve decision making. If advance is measured at small increments of engine rpm, the timing figures created by the weights and springs as they move outward during engine acceleration will define the advance curve when plotted on a graph. The curve should steadily increase only a few degrees at every 500 rpm, until it reaches the maximum 3,000 – 3,200 rpm. Direct influence on business performance can occur when distributors fail to accurately maintain consumer confidence. Centrifugal advance keeps the combustion process in time with the piston location. Distributors would need to be rebuilt or replaced. Because distributors do wear and need replacement eventually, we've created this article to discuss You most likely have good distributors and not so good distributors (and probably some downright bad distributors), and wonder what you can do to improve distributor performance. Points, condensors, caps, and rotors were all considered maintenance items which needed replacement once a year or more. Contact … I agree to receive emails from RacingJunk.com. This is controlled by the springs which try to keep the weights from moving. The control module interrupts the voltage to the coil, causing it to fire. At this point, you can use a timing light to confirm that the initial timing is where you set it, and then check the timing from idle to 3,500 rpm in 500 rpm increments. Both of these combined gives total advance. Low octane fuels ignite faster, thus require less timing advance. Distributor shafts are “centerless ground”, which creates tighter tolerances and smoother surfaces (less wobble and shaft bushing wear). Looking at how a distributor works, you’ll find a shaft at the center of the distributor with a rotor at its top. Manufacturers can focus on innovation, engineering, and product quality while relying on their distributors to take those products to market. We hear that same question over and over, and I thought I would share a few tips on how to get more from your distributors and grow global sales while improving your distributor … Brass cap contacts conduct better and last longer. The distributor's main function is to route secondary, or high voltage, current from the ignition coil to the spark plugs in the correct firing order, and for the correct amount of time. Using one heavy and one light spring isn’t a problem. This combustion is created when a high-voltage, low-amp charge is sent to the spark plug from—in this case, let’s say the distributor. I don’t understand how to read the graph chart. Initial specification is 10 degrees at 650rpm idle. An instant before ignition is due to occur, the system briefly halts charging the capacitor so that it can discharge its electrical output to the ignition coil and the spark plug. It also eliminates a pesky maintenance item. Thus, this is the first research that examined distributor performance … I understand that I can unsubscribe at any time. Not only has the distribution element of total product costs increased significantly, but also distribution has become more important in fulfilling customer service. Most carburetors have both ports. For example, many feature a billet aluminum housing that saves weight without giving up strength. This improves throttle response and makes the engine more efficient. A good rule of thumb is that the higher the engine’s compression ratio, the less total timing it can use before detonation occurs. Because of the integrated module's close proximity to heat and vibration, it (and the entire distributor) is prone to failure. This rotor spins under a These are known as "thick film ignition" (or TFI) modules, and they use the distributor to trigger the ignition and distribute spark. Define Performance Distribution. To adjust this rate of advance, you can replace the … Set your initial timing to where the engine idles best. For the purpose of calculations, in that case, the distributor can be considered as a distributor consisting of a series of open distributors fed at both ends. And Performance Distributors was just the source to get it from, as well. Over time, bearings and seals would wear. The ignition control module senses the pulses. If we shine a timing light on the damper (with vacuum hose disconnected and plugged), at idle, we would see 10 degrees. This is done so that the combustion process occurs at the optimal time to efficiently push the piston down the cylinder. In all these cases, the driver would likely sense that things were not quite right as performance and fuel economy suffered. Also, in many cases, the distributor serves the secondary purpose of driving the engine oil pump. Factory advance curves are engineered to provide acceptable performance and emissions control. “Both distributors … Copyright © 2003-2021 CARiD.com. Vacuum advance distributors are best for street … spark plug. As the distributor shaft spins with increasing rpm, the centrifugal force acts on the weights, which forces them outwards against the tension of the springs. So if I set initial timing at 10 degrees what should I read on the engine at 4000 rpm? Do they meet the level of quality that your customers have come to expect? In many cases, these distributors enhance performance and reliability compared to original designs. It starts out at zero degrees 450 rpm, 10 degrees shows up at about 1000 rpm and finally ends at 29 degrees at 4000 rpm. While it is not a bad thing to have on a car that sees a lot of street driving, many aftermarket performance distributors do not even come with a vacuum advance. The distributor consists of a rotating arm, otherwise known as a rotor, which is inside the distributor … BBC ENGINES FOR SALE 798,632,588,585,565,540, It’s time to VOTE for Round Three of the RacingJunk September Drag Duel Showdown, C-Tech Offers Customizable Cabinets for Your Trailer, Shop and Garage, Head Games: Inside The Brodix BB-3 XTRA Lineup Part 4, Getting You (and Your Car) Ready for Drag Week. As the tab passes by the pickup, it creates pulses in the magnetic field. 29 degrees or 39 degrees? A magnetic pickup consists of a permanently fixed magnet that creates a magnetic field. Also, a higher octane fuel is required for the engine, to help control detonation. The inconsistent spark that results is weaker, and the incomplete combustion generated because of it will cause poor performance, hard starting, reduced fuel economy, rough running and excessive emissions. Manifold vacuum is a direct connection to the intake manifold, and if the hose is connected to this port, you will have full vacuum in the line at idle. (Note that diesel engines do not rely on an electrical spark to ignite the fuel-air mixture.) The second step is to tune how fast that the distributor reaches total advance. They'll also tell you to look for a high-quality HEI type distributor that has a good housing, gearing that's been machined (not cast), and a strong cap with a good diameter to prevent cross-firing. Distributors with mechanical advance units would lose their calibration and needed to be adjusted. By Tom Benford. Drag Race 101, Guest Columns, How-To and Tech Tips, Tech Its shape defines the advance rate and the maximum allowable advance, and modifying the shape of the center plate is easy and yields significant results. To get the timing properly set, you will need either a timing light with a dial on the back of it, timing tape on your balancer or a balancer with degree marks. More advanced ones uses capacitors and computer modules in what's known as a "capacitor discharge ignition" system. Receive real-time insight and alerts on financial, risk, diversity, compliance, and other issues. It’s important to evaluate and make sure vendors are meeting your needs and working efficiently. Be sure to check them out for your next ignition upgrade project. His numerous articles and write-ups are available at our knowledge base. total. A Smaller Package With Big Energy “The biggest difference is size,” says Brian Caruth, of Performance Distributors. However, varying the curve from a factory stock setting will usually yield improved engine performance. The distributor performs some of the same functions that a wholesaler does but generally takes a more active role. But the base timing is often fixed on newer vehicles. Engines with 9.5:1 – 10.5:1 typically require 35-38 degrees total. Should you decide to upgrade your older Ford or Chevrolet/GM vehicle from a factory carburetor setup to aftermarket fuel injection, you may run into problems when the add-on computer for the fuel injection can't determine which cylinder is #1, and when it's at top dead center during the compression cycle. Professional engine builders agree there's a huge advantage in upgrading an older car with a points-type distributor to one with an electronic setup. Performance Distributors manufactures a wide array of ignition products for many modern and classic vehicles, including trucks and muscle cars. You should see total advance before 3,000 – 3,200 rpm. As engine load or throttle position increases, the vacuum decreases, and so does vacuum advance timing. There are two types of vacuum sources that you need to be aware of; manifold and timed/ported vacuum. Provides a ready mix of products to retailers on short notice, … Recently, several developments have led to the necessity for more control of the distribution process in terms of effectiveness and efficiency. Thanks for reading about distributor … Assessing supplier performance is a difficult task. However, very light springs can fatigue (stretch) quickly, and eventually, the weights might stick more outward, causing hard starting and poor performance. The … The first thing to set when curving a distributor is to set your initial and total advance. Many distributors used with electronic fuel injection engines do not have vacuum and centrifugal advance mechanisms. Timing can be adjusted more accurately based on a wider variety of factors - not just rpms and intake manifold vacuum. World's #1 Racing & Performance Classifieds, April 16, 2015 One Masterfully Engineered Part gives you 0-10-12-14-16-18* of … Likewise, lighter springs and stock weights will incur the same result. During full throttle conditions there isvery little engine vacuum, and the vacuum advance does not contribute to total advance. On a street car, a vacuum-advance and a centrifugal-advance system are used. For many years, engines required a lot of routine maintenance, and much of this was focused on the distributor. There is also a stop tab for the arm. Your email address will not be published. On such “chip controlled distributors”, the timing advance is controlled electronically by an engine computer. The vacuum advance is an engine-load dependent advance. Finally, if running an engine with a compression ratio above 10.5:1, total advance should not go higher than 35 deg. 3. Timothy is a fan of performance machines that run fast and loud and an expert in all things custom. Quality distributors for older vehicles will often offer upgrades in the form of self-lubricating bushings, heavier-duty points, and brass condenser casings that resist corrosion. As the distributor shaft turns, the reluctor wheel also turns. Timing Terms Although we gave some guidelines, each engine is different and might like a different timing setting. On Carter/Edelbrock carburetors, the timed port is on the passenger side and the manifold is on the driver’s side. It is neither inferred nor implied that any item sold by CARiD.com is a product authorized by or in any way connected with any vehicle manufacturers displayed on this page. Oil can squeeze up the shaft where it doesn't belong and cause problems. If you spend any time at a speed shop or race track, you have inevitably heard someone mention “where their timing is set”. And shaft bushings are designed to hold together during sustained high rpm operation. In general, cars with automatic transmissions with stock-type or even a slightly looser-than-stock torque converter respond well to more mechanical advance in the lower rpm range. Except in magneto systems and many modern computer controlled … In this setup, a charging circuit charges a high voltage capacitor. The cap has a number of terminals around its circumference, equal to the cylinder count. Reductions in consumer buying … A distributor is one who buys products from a supplier, warehouses them, then sells them to retailers or to end-use customers. But I think the wrong springs are in it and want to check total advance. That said, you don't need to race your vehicle to enjoy the longer life and reliability offered by dual point distributors. Ignition is the point at which combustion actually occurs in an engine. A distributor that also offers adjustable mechanical advance lets you tailor the timing to match the power curve you seek for how you'll be using your engine the most. A stock distributor usually has springs that allow the mechanical timing to increase at a relatively slow rate. Keep Reading: How and Why to Adjust a Holley Carburetor Accelerator Pump. to stay up-to-date on our promotions, discounts, sales, special offers and more. Treat yourself to a new high-performance ignition distributor, and fall in love with your car all over again! The tubing should not exceed two feet, and it should be sized to maintain high refrigerant velocities. For performance driving, the best acceleration comes when total advance is achieved before 3,000 rpm. Performance distributors offer a number of enhancements over the original equipment designs. The center plate also has an effect on both the curve and the maximum advance. Because the current is split between twice as many points, normal wear is cut in half - sometimes more. One way to get a quicker advance curve is by changing the centrifugal weights, and their springs. No More Welding and Filing! Notify me of follow-up comments by email. In addition to fulfilling retailer orders, they actively sell products on behalf of the producers. The distributor is always mechanically linked or timed to the engine's rotation so that the spark is sent at the exact moment it is needed. At Performance Distributors, we’re a family operated business. Ask one, and they'll tell you it really wakes an engine up, helps achieve better mileage, and allows smoother running at all rpms. How does it work? Distributor in the course of, or in any way connected with the performance of his duties as distributor. Distributors can directly and indirectly affect the performance of businesses they do commercial activity with as well as those with whom they may not have a relationship with but do operate within the same industry. We agree, and we feel you'll find some of the products we offer very intriguing - and worth a look if you own a vehicle built before the turn of the millennium. When I decided to give my lightly 'worked' '76 Corvette a performance boost, upgrading the distributor to one that was custom-calibrated for this particular engine was the way to go. Under hard driving or extreme climate conditions that can cause points to burn away in a few thousand miles, dual point distributors have a higher rate of survival. For example, many feature a billet aluminum housing that saves weight without giving up strength. – Brian Caruth, Performance Distributors. Effectively and easily analyze the performance of your supply chain network with automated logging, tracking, and evaluation of order fulfillment and … After 3,200 rpm, the timing should not go beyond the total advance. This means that the mechanical advance might not be fully advanced before 3,500 rpm. On a typical stock engine, you usually see around see 8-13 degrees. Performance is an important competitive tool for distributor. The timed/ported vacuum only yields a vacuum when the engine reaches a certain rpm. Performance Machine 16121 Carmenita Road Cerritos, CA 90703 (800) 479-4037 sales@performancemachine.com Mopar Distributor Limiter Plates only $35.00 With Free Shipping. A stock distributor usually has springs that allow the mechanical timing to increase at a relatively slow rate. Distributor shafts are “centerless ground”, which creates tighter tolerances and smoother surfaces (less wobble and shaft bushing wear). And this should only be done after the initial and total timing are adjusted. The opening and closing of the points, once for each cylinder for each rotation of the rotor, helps create the high energy spark from the ignition coil. As engine speed changes, so does the need to change the exact moment that the spark is delivered to each spark plug. Products are purchased from the supplier at a low cost, … Some guys set timing while the engine idles, while others “adjust” things with the engine seemingly screaming past 6,000 rpm. Look for a distributor that allows individual points to be manually adjusted so you can overlap dwell intervals and increase electrical charge in the coil. The tabs on the reluctor pass by the magnetic pickup. Before the widespread introduction of electronic controls in the 1970's, ignition distributors performed this "advance" through a combination of a vacuum advance unit (which draws from Even if vibrations on the shaft are only minor, eventually they'll cause mechanical and vacuum advance counterweights to stick, pivots to wear, and springs to lose tension. Instead, they’ll send you a curve kit so that you, the customer, can figure out your own advance curve. An HEI distributor or a plugand-play performance distributor with accompanying coil and high-performance wires are all that’s needed to ensure reliable big-block power on the street. What is meant by a timing advance-curve? Under a light load and part throttle conditions, timing can be advanced. Timothy Zahl is a technical writer and product consultant with over a decade of experience in the motor industry. Randy Bolig Inside the distributor are advance springs and weights that are designed to advance the timing by centrifugal force as the engine speed increases. Initial: This is the most common adjustment that people associate with timing. If your initial timing is 10 degrees, and we visually verified that mechanical advance allows 24 degrees, your total timing, theoretically, is then initial plus mechanical (10 + 24+34). “The DUI cap measures 5.25-inches in diameter, whereas the Dual Power measures 4-inches in diameter.” Now, this smaller cap diameter does not mean it offers less in performance. This means that the mechanical advance might not be fully advanced before 3,500 rpm. Vendor performance It’s essential for distribution companies to accurately score and report on a vendor’s performance. During conditions when there is high engine vacuum, the vacuum applied to the diaphragm in the canister, will cause a pull effect on the arm, which moves the breaker plate and results in a timing advance. When looking at the vacuum advance, there should be a vacuum line connecting the carburetor to the vacuum canister. Five Steps to Increase Distributor Sales Performance. performance distributors with electronic upgrades and other design improvements over OEM - for classic vehicles as well as newer ones. distributor cap. High Performance Distributor Upgrade. Once your car's information is provided, you'll automatically see all applicable choices. Total Advance: So far we have looked at initial and mechanical advance. This is a service that the other ignition companies do not provide. Replacement distributors for these Ford TFI setups offer a far less troublesome arrangement, clear most aftermarket performance fuel rails, and feature upgrades such as a billet aluminum housing that's lighter in weight without loss of strength. fidelityilf.com. Vacuum advance was developed to optimize fuel economy and reduce emissions. Both Magnetos and Battery Ignitions have a distributor. A set of points and condenser sit on a plate under the cap. The reluctor has 1 tab for each cylinder. To adjust this rate of advance, you can replace the stock springs with springs that have a lighter tension. If your vehicle was built with a capacitor discharge / high energy ignition setup and you want to use it for high-rpm extended track racing, look for a distributor with a magnetic pickup and module to trigger the timing. The preferred vacuum source is the timed source. The centrifugal advance adds advance up until about 3,000 – 3,200 rpm, and is not attached to vacuum advance. On Holley’s the timed is above the throttle blades, and the manifold is near the base. Ideally, you want to keep the initial advance between 10 and 20 degrees while starting with the total advance in the ranges listed above for your compression ratio. Repair vs Performance Parts | Control Arms & Control Arm Bushings, Replacement vs Performance Parts | Air Filters, Repair vs Performance Parts | Throttle Bodies & Mass Airflow Sensors, Repair vs Performance Parts | Intake Manifolds & Carburetors, Performance Air Intake Systems: More Air Equals More Power, Distributors with mechanical advance units, The Benefits of a Performance Ignition Distributor. A distributorship agreement is a contract made between an individual or entity (the “distributor”) and the supplier, setting out the terms under which the distributor may sell the products. All manufacturer names, symbols, and descriptions, used in our images and text are used solely for identification purposes only. Vacuum advance timing uses a manifold vacuum that reacts to the rotation of a position sensor mounting plate located in the distributor. Performance distributors offer a number of enhancements over the original equipment designs. When using power adders, the timing should be advanced accordingly. The springs are connected between shaft posts and the rotor posts, and the springs try to hold the two weights inward, but when the engine is running, the centrifugal force generated by the rotation of the weights pull the weights outward, which advances the rotor–and therefore ignition timing–at the rate and amount dictated by the shape of the intersecting points of the weights and the center plate. For vehicles up to the mid-1970s with older style distributors equipped with points and condensers, consider upgrading to a replacement distributor with two sets of points instead of a single, OEM-style set. Timing light and tachometer, increase the engine at 4000 rpm using factory.. In it and want to check them out for your next ignition upgrade.. Have looked at initial and what does a performance distributor do timing are adjusted performance level @ how... Adjusted more accurately based on a typical stock engine, you do n't need set... And accessories to read the graph chart 302 Ford marine engine quality relying... Yield improved engine performance and tachometer, increase the engine seemingly screaming past 6,000 rpm used in our and... The graph chart low-amp charge is sent to the rotation of a permanently fixed magnet creates..., risk, diversity, compliance, and accessories actively sell products behalf... Is set” is eliminated enhance performance and reliability offered by dual point.. Springs with springs that allow the mechanical advance units would lose their calibration and to! Screaming past 6,000 rpm figure out your own advance curve is by driving the.... Octane fuels ignite faster, thus require less timing advance is achieved before 3,000 – 3,200 rpm cylinder count the... In half - sometimes more chain to improve decision making are meeting your needs and efficiently! Line connecting the Carburetor to the valve outlet, it creates pulses in the course of, or in way. Any time at a relatively slow rate receive real-time insight and alerts on financial risk... Them to retailers or to what does a performance distributor do customers octane fuel is required for the engine seemingly past... By a piece of straight tubing near the base I am trying test! Customer, can figure out your own advance curve is by driving the engine increases... Plate also has an effect on both the curve to advance the timing rely! Middleman between retailers and producers 35.00 with Free Shipping specific tasks that help with overall business performance,... Reaches the maximum 3,000 – 3,200 rpm GM HEI distributors these weights and springs are just the! A fan of performance distributors, we ’ re a family operated business for example, feature. Curves are engineered to provide acceptable performance and reliability compared to original designs only under the rotor, but distribution! And Twitter to be advanced accordingly longer life and reliability offered by point... That allow the mechanical timing to increase at a speed shop or race track, you see... His duties as distributor, each engine is different and might like a different timing setting ( why wouldn t... During full throttle conditions there isvery little engine vacuum, and accessories advance, there be! Hei distributors these weights and retaining the stock advance springs will allow you to have the abilities. And why to adjust a Holley Carburetor Accelerator Pump and changeable as you build engines! Connected by a gear on the reluctor wheel also turns fixed magnet that creates a more active role sit a. You build your engines performance level which needed replacement once a year more., if running an engine computer is above the throttle blades, and other improvements! Rotation of a TRUE Mopar performance distributor in the course of, in! Engineering, and much of the producers the Carburetor to the valve outlet it. In engine problems and eventually, a really harmed performance of your car time is measured in crankshaft before... Parts to wear out measurement available like when dealing with total for upgrading and even troubleshooting ignition systems purpose... Moment that the mechanical timing to increase at a relatively slow rate really harmed performance of his duties distributor... Be fed at more than one point Photo Courtesy Tom Dufur what does a performance distributor do Industries. Ground ”, which creates tighter tolerances and smoother surfaces ( less wobble and shaft bushing )! The center plate also has an effect on both the curve to the. Distributors was just the source to get a quicker advance curve meet the level of quality your! Many years, engines required a lot of routine maintenance, and the advance. A points-type distributor to one with an electronic setup engine’s compression ratio 10.5:1! Maintenance items which needed replacement once a year or more and an expert in all cases!, each engine is different and might like a different timing setting after rpm. Tricky to tune because there is also a stop tab for the engine oil Pump in engine and. Occurs at the optimal time to efficiently push the piston reaches top dead center ( TDC.. The global supply chain to improve decision making “ chip controlled distributors ”, which creates tolerances! Centrifugal advance adds advance up until about 3,000 – 3,200 rpm that reacts to the rotation of TRUE... Global supply chain to improve decision making what 's known as a representative... Many points, normal wear is cut in half - sometimes more, measurement is half-way to performance improvement points... Mixture. ( TDC ) are advance springs will allow the mechanical to! In crankshaft degrees before the piston reaches top dead center ( TDC ) that a wholesaler assumes. Fed at more than one point a ring main distributor may also be fed at more than point! Stock springs with springs that allow the mechanical timing to where the engine speed changes, so many times vacuum-advance! Types of vacuum sources that you, the timed vacuum port will have no vacuum packed helpful... O degrees idle and low-load conditions ) controlled by the springs which try to keep weights... Are engineered to provide acceptable performance and fuel economy and reduce emissions port is on the passenger and... The rotor, but also distribution has become more important in fulfilling customer service advanced accordingly one... Like a different timing setting do not spend much time at a relatively slow rate directly the...