I'm far from an expert. I just have enough experience to be dangerous! On our race car (see avatar) the timing is locked at 36 degrees- 36 degrees at idle, 36 degrees at redline and everywhere in between. A decent drag racer or road racer will humble me with their knowledge of advance curves.johnny79 said:Billyjack, since you are an expert let me ask you this
Actually, you want to do the opposite. Since a curve kit and more initial advance will yield greater total advance, you want to reduce the amount of vacuum advance. The vac advance is only a factor at high vac conditions- i.e. small throttle openings. Reducing the amount of vac advance helps avoid pinging at light throttle. When you're on the throttle heavy, it's all in the initial advance and the curve. There's little engine vacuum at hard throttle, so the vacuum advance unit is idle.johnny79 said:I just got an adjustable vacuum advance. Goes from quick, super quick to ultra-quick. I haven't installed it and have already bumped up my timing a little and noticed a big difference. Why would I want more vac advance?? Isn't that for when you aren't throttling?
The springs only control the rate of climb in advance with respect to rpm. On a properly set up distributor, all the advance is in by 3000 rpm or so. Nothing more happens after that.johnny79 said:I assume the heavier springs are to retard at higher RPMS?
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