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Originally Posted by NoDOHC
I have also been experiencing pre-ignition at very low advance numbers (32-34 degrees) this only occurs after prolonged hard acceleration up a steep hill. I am running 9.2:1 polished S4 NA Rotors. I ran 38 degrees just fine with non-polished 9.4:1 S4 NA rotors with the stock ignition system.
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Is there a typo in there somewhere?
I assume TOTAL advance under WOT = "0" vacuum?
If so, 30+ degrees if advance is a LOT of ignition advance.
Are you running some kinda exotic fuel?
The engine doesn't typically make that much more power with that kinda ignition advance, but it does make the EGT hot!
Speaking of which...
Do you know EGT's?
Quote:
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Has any one tried running a BRK9EQ from the trailing position in the leading position for a high-powered NA application?
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I assume this is a typo - BUR9EQ?
I don't see why you can't try it...
As of this point, this is your cheapest option versus 10.5, 11, 13 heat range plugs...
-Ted