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Re: Rod Ratio
[Re: MoparMarz]
#1429654
05/03/13 03:08 PM
05/03/13 03:08 PM
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Joined: Aug 2003
Posts: 43,126 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,126
Bend,OR USA
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Quote:
What are the premium bore to stroke ratio and the rod to stroke ratio when building a stroker 340, stroke is 4.125 with a 6.2 rod and a 4.125 bore.
Sounds like you already have the crank and rods so the option of optimizing the stroke/rod length ratio is not possible, unless you want to buy another set of rods I've heard from 1.60 to 1.80 ratio is best with 1.75 as the best, I understand the NHRA Pro Stock motors are near 1.82 to 1 ratio or higher Your current parts = 4.125 divided into 6.20 = 1.503 ratio I built a 4.00 inch stroke 340 block yeas ago for pump gas street use with NOS at the track, it is still runiing today, lots of street miles and a lot of hard passes on it. it has a set of stock length and spec. Eagle H beam rods in it 4.0 divided into 6.123 = 1.530 ratio Run it if you want, change it if you want The longer rod will help make the piston lighter also
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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