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Old 03-18-2012, 09:03 AM
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Superlight Scat Crank

I haven't bought a crank for my 496 stroker yet. Gen VI block.
Scat has a forged regular weight 4.25" crank for the one piece seal at 70LBS.

I could get the super light forged crank at 59 LBS. This one would require a seperate seal adaptor as they're only available in the two piece style.

If the extra cost is not a factor and this is going in a high compression, high torque street motor, looking for good cruise characteristics and engine smoothness, will the 11 LBS weight savings help?

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Old 03-18-2012, 09:12 AM
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Quote:
Originally Posted by 123pugsy
I haven't bought a crank for my 496 stroker yet. Gen VI block.
Scat has a forged regular weight 4.25" crank for the one piece seal at 70LBS.

I could get the super light forged crank at 59 LBS. This one would require a seperate seal adaptor as they're only available in the two piece style.

If the extra cost is not a factor and this is going in a high compression, high torque street motor, looking for good cruise characteristics and engine smoothness, will the 11 LBS weight savings help?
If I were building the motor for a class of competition, then I would want every advantage I could buy and would not hesitate to use the lighter crank, no matter how much it cost.

If I were building a motor for good cruise characteristics and engine smoothness, I would build a low compression motor so that I could use a short cam with short duration, ground on a 112/114 LSA. If you build a high compression motor, then you will have to use a tall cam with lots of duration to prevent excessive cylinder pressure and I don't think you will be happy with the results.
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Old 03-18-2012, 09:42 AM
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Not worth the cost and hard to balance, Mallory is costly, unless you are using an ultra light rotating assembly. Two piece adapters are also $$$.

I had a customer go this route and the Mallory metal cost $400.00 plus the cost of the balance $225.00
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Old 03-18-2012, 10:32 AM
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Thanks guys.
The compression won't be too high at 10.4:1 with aluminum heads.
I should have stated cylinder pressures will be high with 8.4 dynamic.

It will be a short cammed (somewhere between 210-220 duration), fuel injected torque motor.

So if weight is not a huge factor for a smoother running motor, I can save about 600 bucks on the crank and seal adaptor.

I'm just thinking of how to put together the best cruising and most fuel efficient motor (including long highway drives) that I can. I know BBC's and fuel efficiency should not be in the same sentence but a couple miles a gallon these days is great savings at the pump.
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