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I am curious what compression ratios people are getting away with in 'L-6' engines w/o destroying parts. I am on my last chore engine build before starting my 3.1L project. I am ready to choose pistons and head.

Some new vehicles and motorcycles are getting away with impressive compression ratios but these have more modern (high turbulence) combustion chambers and in the case of the cars electronic ignition control with nock sensors so I don't think these are valid indicators of what is possible with in an L series engine.

I have E31, N47 and P79 heads but may look at purhasing a P90. Don't want to spend $ to get big valves in E31, don't like liners in P79 & don't have an opinion on N47.

CR from 9 to one all the way up to 12 to one are avail. w/ 1mm or 2mm head gaskets, flat or dished pistons and various cumbustion chamber volumes...........

Thanks for the input.

Tomh
 
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