Connecting rod length
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Connecting rod length
Is there any association of tuning window to rod length?
As in, the longer rod narrows the tuning window where a shorter rod can broaden the window. Or vise versa
As in, the longer rod narrows the tuning window where a shorter rod can broaden the window. Or vise versa
EverySparePenny- Posts : 114
Join date : 2017-12-19
Location : Iowa
Re: Connecting rod length
Some people think there is, due to the piston acceleration with shorter rods, away from TDC. However, when you do the math, it might amount to a small difference such as .003". IMO that's flyshit, and is a non issue. I would rather go with longer rods and reduce rod angularity on the cylinder side wall.
Charlie
Charlie
c.evans- BBF VENDOR SPONSOR
- Posts : 2260
Join date : 2008-12-03
Re: Connecting rod length
EverySparePenny wrote:Is there any association of tuning window to rod length?
As in, the longer rod narrows the tuning window where a shorter rod can broaden the window. Or vise versa
It depends on a few things,What you are doing with the engine. Deck height, Runner lenght,and planed RPM
BOSS 429- Posts : 2372
Join date : 2009-08-10
Location : Ill
Re: Connecting rod length
EverySparePenny wrote:Is there any association of tuning window to rod length?
As in, the longer rod narrows the tuning window where a shorter rod can broaden the window. Or vise versa
The difference is minimal other than where the downforce of the piston combination exerts pressure.
A shorter rod will exert more pressure on the cylinder wall and less on the main bearing saddle as a function of rod angularity in the bore where the power forces are taking place above the piston. A longer rod will do just the opposite.
Unless you are talking about an inch of difference then it will not be much.
A longer rod will move the piston very slightly slower near the top of the bore but, faster than a shorter rod near the bottom of the bore
The biggest difference will be with a stroker engine where the shorter rod will expose more of the piston to the crankcase below the bore at the bottom of the stroke.
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