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Chris Cogan · 11-11-2007, 11:00 PM

Hi Art,
I think that most people will tell you that the answer is C, but if I were you I would run the shorter rod. For two simple reasons: One, a shorter rod is a lighter rod. Two, a shorter rod is more forgiving of detontation. This is just my 2 cents based on my experiences with large cubic inch engines. I have seen 700 plus cubic inch engines regularly turn 8000 rpm with rod to stroke ratios between 1.37 - 1.41 and when dealing with high compression ratios and or nitrous oxide, you want the piston to accelerate away from top dead as quickly as possible. IHRA pro stock engines run relatively short rods for this very reason. Again, just my 2 cents. Take care!

Chris Cogan
Kaizen Motorsports

11-11-2007, 11:00 PM	#2
Chris Cogan Junior Member Join Date: Apr 2007 Location: Defiance, OH Posts: 47 Likes: 0 Liked 0 Times in 0 Posts	Re: Rod length? Piston speed? Hi Art, I think that most people will tell you that the answer is C, but if I were you I would run the shorter rod. For two simple reasons: One, a shorter rod is a lighter rod. Two, a shorter rod is more forgiving of detontation. This is just my 2 cents based on my experiences with large cubic inch engines. I have seen 700 plus cubic inch engines regularly turn 8000 rpm with rod to stroke ratios between 1.37 - 1.41 and when dealing with high compression ratios and or nitrous oxide, you want the piston to accelerate away from top dead as quickly as possible. IHRA pro stock engines run relatively short rods for this very reason. Again, just my 2 cents. Take care! Chris Cogan Kaizen Motorsports