Quote:
Originally Posted by BruceWilkie
IMO 11:1 with iron heads is pushin things if you get beyond mild amounts of boost... Watch your charge temps(intake manifold) and use water injection... Usually 50/50 water meth... but I'd be inclined to run a greater percentage of water as even methanol can be induced to detonate if the combination of charge temp and compression temp gets too high. Intercooling should also be a consideration if you start going beyond mild amounts of boost. Especially at that compression.
I plan on runnin iron D-Ports myself... 8-8.5:1 if gas and @ 9.5-9.75:1 if E85 and turn up the boost. I have too much experience pushing combustion control to its limit... I can be conservative and still make more power than I can use.
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I know you get a better clamping force with the iron heads, but these aluminum heads are what I have to work with for now. I am hoping with the mild boost everything will be ok. I will have an air to air intercooler, but may look into air to water intercooler as well.
I need to do more research to see what kind of power to expect.