10-15-2011, 08:17 PM
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CC Member
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Join Date: Aug 2007
Location: NE Oklahoma,
OK
Cobra Make, Engine: Fords
Posts: 544
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Quote:
Originally Posted by blykins
That's a pretty common misconception....a longer stroked engine can pull the rpms just like a short stroke engine. I have 4.100" stroke 445W's pulling over 6500, as well as 4.300" stroke Boss 9 engines pulling 6500 rpms.
I have a customer that runs the 7.50 1/8th mile class. The 347 that I did for him gets shifted at 7000.
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in the narrow scope of this discussion, using stroked SBF engines as examples, you are essentially correct. As you say, a 289 stroked to 331, etc, will rev to 7,000 or more. Bit I still maintain that shorter stoke engines will hit the red line quicker if the overall displacement is more or less equal.
In the long run, long stroke engines just can't compete with over-square engines in a maximum rpm context. Valve size is the one major limitation in small bore/long stroke engines, but excessive piston speed (measured in ft traved per minute at maximum rpm) cannot be ignored.
That said, for example I am much more happy riding the long stroke 650cc Triumph vs. the short stroke 650cc BSA.
Z.
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Last edited by zrayr; 10-15-2011 at 08:31 PM..
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