RE: Crankshafts: 318 Poly vs. 340 Forged

["Tony G." <xzaofreakx@xxxxxxxxxxx>]

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Gary,

Thank you for your reply.

My plans with the engine are my 340 block 0.030 over bored, all five 
ProGram billet 4 bolt main caps, 318 poly crank?, eagle h-beam rods, 
diamond racing pistons (flat top), edelbrock aluminum heads with roller 
rockers & some porting, final compresion ratio around 10:1. I'm not 
quite sure if I will actually get it to 500hp. I am hoping I can get 
very close to that based on the dyno test at edelbrock: 
http://www.edelbrock.com/automotive/7176pp.html where they got 417HP & 
397 Ft/Lbs of torque out of a 340. I do not want to use NOS or forced 
induction. Any suggestions on how to raise the HP above edelbrock's test 
results? Without nos, will my poly crank hold out fine? Thanx!

-Tony

Gary Pavlovich wrote:
> 
> 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:
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