Quote:
Originally Posted by 911 Rod
What is considered too much of a compression ratio to Turbo?
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Depends on how much boost you want to run, the ignition system (single or twin plug), and the cam profile to a degree as well. Over on the 930 forum, I think 8:1 or 8.5:1 is on the high end of the range for built air-cooled turbo engines. These cars typically run 12-15psi of boost.
Edit: if you're talking about turbo-charging an NA 911, I think the route is a low pressure turbo set up, 5-7psi.