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Old 05-16-2009, 10:06 PM
Custom10's Avatar
my KARMA ran over my DOGMA
 

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HEI Spring Selection

Has anyone ever ran two different spring types in an HEI? I installed the moroso weight kit in mine. I was able to get the curve the way I wanted it with the lightest springs. However it seems as though the timing is not consistent now at idle. With the timing light you can watch it fluctuate a couple of deg after I rev the motor a bit and then let it settle back down to idle. Some times its sits at 12 were I want it other times its 14 or 15 deg BTDC. I switched back to the stock springs which are much heavier. The timing is bang on every time now at 12 deg. at idle after a little shot of gas. Someone told me to try using one light and one medium spring cause the mech advance is what is changing the timing because the light springs can't bring the mechanism back to home base, make sense?

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Old 05-16-2009, 10:28 PM
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Yep, you are correct, have seen this many times before, two different springs is the cure like you are thinking.
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Old 05-16-2009, 10:35 PM
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One light, and one medium spring combo... would most likely take care of your problem.
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Old 05-16-2009, 10:39 PM
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my KARMA ran over my DOGMA
 

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OK thanks. Just was not usre if this would some how cause some type of imbalance within the mechanism. I will try out some combinations of different springs hopefuly I can get it right, Cheers
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