![]() ![]() For that reason, it is best paired with another form of ignition advance: you guessed it, the vacuum canister. Also, adjust the rpm on the spark plug on the heat with a screwdriver up to about 700 by turning it counterclockwise. Then, adjust the rpm by opening the carburetor out or close it to get about 21 and ½ inches on the vacuum. It cannot take into account engine load, fuel mixture or any of the many other variables that dictate ideal ignition timing. Adjust the carburetor to get the best vacuum possible. MSD offers an accurate timing light that is designed to work with high powered, multi-spark ignitions and magnetos. Mechanical advance relies on one input, and one input alone: RPM. Best Overall INNOVA Pro-Timing Light with Tool Case Check Latest Price Summary This professional, multi-function light has a slim, rotating barrel for easy access and better aim and a handle. We make mechanical advance sound pretty great- and in theory, it is - but there is a major problem with it as the only source of ignition timing compensation. Innova is a manufacturer producing specialized tools and equipment for automotive enthusiasts and professional mechanics. Using a timing light the timing should remain at the same point at idle and advance with more RPMs. Reconnect The vacuum line between the carb and the distributor advance. Set your initial timing at idle to 12-degrees at idle. It can be adjusted by changing the stiffness of the springs on the distributor's weights, and the amount of mechanical advance can be increased or decreased based on stop-bushings in the mechanism. Disconnect the engines vacuum advance at the carb and put a plug on the port then start the engine. This mechanical (also known as a centrifugal) advance is an extremely reliable and simplistic approach to controlling engine timing at given engine speeds. As the distributor spins faster and faster with engine RPM, centrifugal forces fling out weights inside the distributor housing, moving a cam mechanism and advancing the timing. For this reason, a mechanical advance is built into most distributors. That set up isn't possible with a conventional single setting gun.As an engine revs up, we need to allow even more of a head start for the spark plug in order for complete combustion to occur. ![]() That car still has a vacuum advance (retard disconnected and plugged), so it should do well at that setting. It was 5 degrees BTDC, which is quite decent considering the distributor hasn't been modified for limiting advance. In fact, on the rebuilt CIH engine I helped do the cam break in yesterday, I set the distributor to 36 degrees BTDC at 3500 rpm FIRST, then checked the base timing at an idle after the cam break in was complete. The "light" can be turned off to use just the tach, eliminating the pesky flashing when not needed. Easy to adjust, and the tach is very useful in setting max advance timing. The first gun is fine for simple stock engines, to confirm and set base timing, and to ensure that maximum advance isn't excessive. That works VERY well, and was crucial in setting advance limits on the modified distributors I have built. It has a digital advance reading, and a digital tachometer. Includes a split-screen digital LCD readout displays with tachometer and advance functions showing simultaneously. ![]() It works reasonable well, although I have since determined that the dial indicator is only accurate to a couple of degrees, so less than perfect. The Innova 3568 top-of-the line timing light is ideal for the selective do-it-yourselfer. ![]() One is a dial-type from Princess Auto (no brand on the gun). I have two advance-adjustable timing light guns. ![]()
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