Thread: BB 454 Gen IV (Mark IV) - Pertronix distributor

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Originally Posted by 34_40

Welcome Aboard CHR... (pun intended!) Nice to see you here.
The default (Silver) spring will work fine. As a base setting. If the fuel available to you can support more timing, step up to the next spring.

Originally Posted by garzeln

Thanks for the answer 34_40
do you have opinion on the limiter ? 12°, 16° or 20° ?

Originally Posted by 34_40

I'm being cautious... I'd say start small. Again, I don't know the fuel that is available.. Then work up and play it safe.

No disagreement with Mike's (34_40) approach. It seems to me that if you have your base timing set at 12°, which I believe would be reasonable, then with your 12° limiter your total timing will only be 24°; with the 16° limiter it will be 28° all in; and with the 20° limiter it will be 32° all in which is still a pretty conservative total timing for those engines. Like Mike says, depending on your local fuel quality starting low is safe, but I would expect that you'll end up with the 20° limiter once you have the engines all dialed in. I believe that's the same thing Mike's saying, too.