![]() ![]() As most of you know, 180 and 215 pumps are more desirable because of the cam they have. Lately, I have been soaking in information on P7100 tech and thought I would run this by you guys who may know more about P7100s than I do. Find your desired setting, then screw the bolt back down. View Full Version : P7100 Timing Advance vs RPM curve. Then just turn the distributor either clockwise or counterclockwise to change the timing while looking at the notches w/ the light to see what the changes are doing. The timing light will only light up when the spark plug fires, and it's so quick that it will show you exactly where on those indicators that the spark plug is firing. ![]() ![]() They are not labeled, but the center notch is correct value. In the crankshaft pulley itself are five notches indicating from left to right 0 - 5 - 10 - 15 - 20. After having performed the procedure above (letting the engine warm up, revving it and such), you first shine your timing light down at the arrow that points to the crankshaft pulley. You just undo the bolt near the distributor cap. It fixed the problem as there is no more pinging. I was hearing this at times, so I changed the timing to 9 degrees BTDC which is within the factory spec of 10 BTDC +/- 2 degees. How To Hook Up And Use A Timing Light Using a timing light is fairly easy. Adjustments can then be made to timing by rotating the distributor to optimize the timing advance. You can hear the spark knock as a harsh "rattling sound" under heavy throttle, usually at lower RPMs. This provides the engine timing in degrees for the engine at the RPMs the timing light is used. Very bad things can happen, like holes in pistons. What happens is the spark plug ignites the fuel/air mixture while the piston is still traveling upwards. Now that I'm back to sea level and after having done the knock sensor bypass, it's imperative to have correct timing because the engine has no way of detecting spark knock, which occurs when the timing is too far advanced. The advanced timing can help maximize fuel economy, increase power, and ensure fuel is ignited most efficiently. Click to expand.I changed the factory timing from the normal -10 BTDC to -13.5 BTDC originally while living in Colorado, as the thinner air at higher elevation permits a bit more advancement on the timing. ![]()
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