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Originally Posted by turtle
986jim
His head gasket prolly didn't blow. My guess is valves...
Keepup did you lengthen the valve overlap at all? If not you would have peak compression WAY higher in the chamber than your set boost was supposed to provide.
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More overlap would reduce pressure in the combustion chamber as boost would be blown out the intake or exhaust valves depending on how you overlap the engine and where your dwell time is.
If you put a larger performance cam on a stock engine and you do a compression test before and after you will notice a drop in compression because of the larger overlap. On a VQ35 we tested from 230psi or so in each cyl to about 195-205 give or take with a set of larger cams.
The only way it's gonna pop is really bad tuning Ie NO fuel added for the charger with 6 psi of boost. Honestly thats childs play. I run 30psi on 117octane gas on my talon and lay over 500whp. I tune it on the fly at the track with a laptop and wideband now... I'm no professional tuner either (well I don't pay myself if thats what you wanna call it) and this is on a 4 cyl making 125whp per cylinder so tuning is fairly critical and it doesn't pop a HG ever.
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