ignition timing advance - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-29-2001, 07:32 PM
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ignition timing advance

I've got an hei on my 258 and i'm getting ready to replace the weghts and springs with a mr gasket recurve kit. Well the kit has three diferent sets of springs, so which ones are the "stock" versions? The diagram for them has one set starting to advance at about 900 rpms. The second set starts at about 1800 rpms and the last ones start about 2500. Anyone have an idea which ones would be the optimal ones to use. Also, the lower the starting rpm the bigger the curve.
thanks, james

82cj7,258,np435,weber,hei,rhino lining
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post #2 of (permalink) Old 06-29-2001, 09:38 PM
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Re: ignition timing advance

The timing curve needed is going to vary from engine to engine. Your 258 will need a different one than mine, etc.Best way is start with the light ones and play with it. Spark knock, power and fuel mileage will have to be monitored. Seat of the pants is about all you have. Just move up in spring size until you're happy with it. you can mix and match them to get it just right. It will be time consuming and frustrating but worth the effort to get it just right. Also you will have to play around with the base timing as you go to optimize overall performance. Don't forget the vac advance. I try to use ported vac so it will be only operable at cruise for MPG.

Have fun'n fun'n fun'n fun........


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