John T said: (quoted from post at 12:54:01 01/09/10) .....................buddies who always timed their cars or trucks too darn fast that they got a noticeable pre ignition spark knock when they floored it or were going up hills............................... were the same guys that when they started their cars you heard those bumping the starter and grunting sounds, again because TOO DERN FAST.
Actually neither one of these indicators is a true test of timing that's "too fast" It can simply mean that because of typical "hot rodding" ---in which changes in induction, exhaust, and especially camshafts and cam timing, have "re-engineered" the engine!!!----and now that "he" has done that, the timing CURVE is all screwed up. The curve can be to short, too long, too slow, too fast, and initial timing can be in the wrong place
There have been SEVERAL friends of mine who, when "flooring" the loud pedal at MEDIUM speed got lots of knock because the advance was "too much" AT THAT MEDIUM RPM yet tests by timing ONLY at high RPM total advance showed the engine WAS making optimum top end power
The point? You can't make blanket statements, especially if the engine has been modified.
Let's not forget, either, the simple things like worn bushings CAN CHANGE THE ADVANCE CURVE because as the shaft moves in the bushing slop it CHANGES THE POINTS GAP and that changes the timing!!!
Worn pivots, springs, etc in these the mechanical advance of these old girls can render conclusions completely erroneous
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