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Re: E85 has much higher octane numbers
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Posted by JimBlake [Email] (#141) [Profile/Gallery] (more from JimBlake) on Mon, 14 Sep 2009 14:39:46 Share Post by Email
In Reply to: E85 has much higher octane numbers, Bruce, Mon, 14 Sep 2009 14:24:50
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A non-turbo engine can't increase it's compression ratio to take advantage of the higher octane. (We're not talking about the Saab variable-compression prototype...) It can only adjust fuel/air mixture & spark timing.

With suitable programming, a turbo engine can increase boost, which (thermodynamically) is almost the same as a higher compression ratio. THAT's where the extra effiency comes from.
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