Quote:
Originally Posted by some_other_dave
Blanket statements like that are quite dangerous. I would not be surprised if we see an engine in the near future that can run 13:1 on 87 octane gasoline. The advances in engine design and (especially!) engine management are helping automakers run higher compression with the same fuel. The aforementioned 14:1 gasoline car will probably only need 91 octane, so it is likely that a 13:1 using the same technology would only require 87.
-soD
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My F4i motorcycle has a 12:1 CR and the recommended fuel is 87 octane. I can work that machine at 14,000 rpm all day long with no problems or performance hits. Then again, the motor is only 600cc.