Re: Crankshafts: 318 Poly vs. 340 Forged

[Gary Pavlovich <glpavlovich@xxxxxxx>]

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Tony,

The steel Poly crank would probably take it as cast cranks are often used in 
440 race motors with great durability but the big block cranks are nestled 
well-into the block and the small block Mopar crank is below much of the 
protective/strengthening block webbing.
You will probably have to spin the 340 into the 7000rpm range and that 
creates exponential stresses over a 6000rpm motor.
I like to "over-engineer" my motors and if I were shooting for 500HP I would 
not compromise on an integral piece as the crank/rods/pistons.

500HP will take quite a few dollars and you should run H-beam rods with your 
crank.
Additionally, you did not mention how you were going to achieve 500HP; if it 
is via nitrous then I would step up to a stronger "race-style" crankshaft. 
I would use a forged steel crank from Callies or Eagle and that will set you 
back $900 plus internal balancing.

I would query other experienced list members as well.
Gary Pavlovich


----- Original Message ----- 
From: "Tony G." <xzaofreakx@xxxxxxxxxxx>
To: <1962to1965mopars@xxxxxxxxxx>
Sent: Tuesday, January 11, 2005 5:27 PM
Subject: Crankshafts: 318 Poly vs. 340 Forged


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I am looking into using a crank out of a 1963 or 1964 poly 318 in my
1972 340 project. How strong is this crank compared to later ones? Would
it be wise to use it in a 340 that will most likely push up to 500hp?
Thank you.

-Tony

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Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html. 


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