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cstreit cstreit is offline
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Join Date: Feb 2000
Location: Naperville, IL USA
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Both comments are on the money. While you "normal" compression ratio is 7.5:1, the dynamic compression (under boost) varies and can be exceed 12:1 easily on a turbo.

Twin plugging the heads is relatively inexpensive, it's the ignition that will cost you. If your builder even thinks this could be an issue better do they heads now and put a blank in them for later. It's better than tearing down the engine later if you do need it IMO.

I'd spend the time to do the math do see if you're gonna need it. What boost levels are you running? What octane are you going to run?
2008 Yamaha R6
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Last edited by cstreit; 11-26-2005 at 08:48 AM..
Old 11-25-2005, 07:04 AM
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