5.7 vs 6 inch rod - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 5th, 03, 03:32 AM Thread Starter
 
Join Date: Dec 2001
Location: gibsonville, NC, USA
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Which makes for a better 383 with power, reliability, and engine wear in mind. 3.75 stroke with a 5.7 inch rod or 3.8 stroke with a 6 inch rod.
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post #2 of 3 (permalink) Old Apr 5th, 03, 10:16 AM
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Location: Waterloo, Iowa
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This will stir up a hornet's nest! I have seen two schools of thought here. One says that a long rod is better for higher rpm operation, as it gives more cylinder filling time, while a short rod is better for low end torque, and allows you to run a few degrees more timing. The other says a rod is a rod is a rod, and that it merely hooks the piston to the crank. On another site, Darin Morgan, who works at Reher-Morrison Racing, and does Pro Stock engine R&D, said that some years ago, in a study funded by GM, they played with varying rod lengths in a race motor. Their findings were that rod length had almost no effect on power curves. I still myself have felt that in most SBC's run at lower rpms that a short rod is better. I even ran a 5.54" rod in a 3.34" stroke 341" race SBC that ran in the 6500-8500 range in front of a Powerglide, and wanted to have more "hit" on the starting line.

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post #3 of 3 (permalink) Old Apr 6th, 03, 09:21 AM
 
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From what I have read, and I have read everything I can get my hands on about this subject for years and years, that it is a balanced combination thing to be able to see/feel the power production differences between both schools of rod length!!

In other words everything has to be right on the nuts for each extreme rod length engine to be able to test apples to apples to get results that can be duplicated!!!

And as stated already, it is an rpm/power point thing more then anything else... As always, jmho...

And to put this in purspective think of the ultimate extremes as being a rod as short as the stroke and one infinately long compared to one another!!!pdq67



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