Long rods or short rods.... The answer

OB_Bob

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Thanks Rick

I have also read some of Smokey's stuff. Very thorough.

By the Way the Busa's ratio is 1.89
Bob
 
in jays crankshaft post we got into this and limits on peak piston. acceleration limits not the actual speeds achieved its good you found this type of article.
 
I have always believed long rodded motors are superior. Anyone who is interested in this should read Smokey Yunicks book. It has the small block chevy as the subject (cover), but applies to ALL engines. The guy is sharp.
 
HA So size DOES matter...


another thing that the article failed to mention.. short rods will put more of a side load on the block when the piston is on its way up making for alittle more fiction loss.... The longer rods dont go throught as much of a angle change compared to the short rods...
 
Long rod motors make more torque. They do this because the piston moves away from TDC more slowly due to the longer rod. This allows more time for the charge to burn and raises peak cylinder pressures, putting more pressure on the piston.
 
The downside is that with the piston dwelling so long at TDC it limits how agressive you can get with the camshaft.

Saw a pro stock car at Pomona with the head surfaces on the block machined so far down it was almost into the water pump bolt holes. Guess his tuneup was very short rods and mountians of camshaft.

Jay
 
by the way Jay thanks for doing the studs i talked to you guys on phone and i realize its a pain so i do apriciate all the help you guys give.you have outstanding customer service and thats what counts when the products are already 1st rate.i do need kz studs 3/4 inch longer than stock and will gladly pay for your help on this important product.
 
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