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RClewett RClewett is offline
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Join Date: Apr 2010
Location: California
Posts: 15
Pardon me. You are correct. I was looking at the torque line not boost. So the boost is good.

I find most dual plug engines on 91 pump gas to need about 22 degrees at 1 bar boost. Sometimes a little more and have seen less. Start with conservative advance. If you put in too much timing the engine develop more heat than power.

When you change the timing from 16 degrees to 22 degrees the power will come up and the engine should lean out as you will have a more complete burn. What I'm saying is monitor your mixtures after changing the timing. It will likely need more fuel.

The increased CR to 8:1 will have a little influence timing. The biggest influence on timing has to do with chamber design, crush area on the piston, exhaust system and fuel. Using premium pump gas, not so much fuel.

Old 04-25-2010, 05:05 PM
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