6109 stroker rod length choice

[49-blues]

What is the best rod length to use with a 3.625" stroker crank and why?

 

[49-blues]

No one has a opinion on this? Is it better to go with a 5.960" rod or a 6.500" rod?or somewhere in between-maybe 6.00" or 6.350"?

 

[Lee Thompson]

Long way from an expert but

I like the 6.350

 

[bison]

The longest ones you can get in there without moving the pins into the oil rings. Longer dwell at TDC and slower piston speeds are the reasons.

 

[KWIKR 1]

good reading :

Importance of Rod Ratio? - Speed Talk

Rod Length article

Connecting Rod vs. Stroke Analysis

Connecting Rod Ratio Calculator

 

[charlief1]

Thanks for the links.

 

[49-blues]

Thanks for the great input!

 

[Nick Micale]

I like the 6.350

I am not an expert either, but according to those who are, Lee and I are in agreement with them!:biggrin:

 

[KWIKR 1]

with a 6.350" rod and a 3.625" stroker crank you'll get a rod ratio of 1.75 the same as a stock 3.8 . a 350 cu/in chev has a ratio of 1.64 . some say this is not very good , but we all know how well a 350 can run and how many miles and abuse they are capable of . a 3.625" crank with a stock length rod (5.960") will net you a 1.64 ratio , same as a 350 chevy . I'm not a expert as well but IMO I don't think rod length/ratio plays a real big factor as long as you keep it within the above mentioned .