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Originally Posted by QWKSNKE
All it takes is oil fumes in the cylinderto cause detonation. Oil fumes from even a PCV return setup will lower your octane rating significantly.
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Yeah, I agree. As I was saying...pump gas begins to have it's limits, but when you introduce oil into the mix...then it really begins to become a major factor.
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Brad, do you have any idea where your WOT timing was set to? Based off your 9psi #'s I am assuming you guys had very little timing in it. How did your a/f look before the head gasket blew?
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Lee, I really couldn't tell you what the WOT timing was at...but it was pretty conservative. Especially on the break-in tune. The reason I don't know is...Blake was doing the tuning on the SDS and I really just put it in his hands.
The air/fuel was more than fine....as a matter of fact, at the top of the rpm range, it had actually started dropping off the graph because of being so rich. And Blake was trying to atleast get it back on the graph when the gasket blew.