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Old 09-01-2008, 05:11 PM
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Can a cast crank handle boost?

Hey guys. Looking into engine options, and and looking ahead at the possiblilites. Will a Scat cast crankshaft with forged pistons and rods be able to handle boost? Nothing crazy, but Im just looking ahead in a few years If I wanted to run mild Forced induction if Id need to swap to a forged crank.

Thanks guys.

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Old 09-01-2008, 06:18 PM
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yes, but you can't go crazy with the boost..
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Old 09-01-2008, 07:46 PM
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I'm going with matt167 on this.. 6-8 psi. Keep the R's in check. No detonation whatsoever.



Ring gaps are important too. N/A motors can get by with less. So if you set it up as such, then later boost it, you may butt a ring and pull a piston apart.

Something to consider.
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Old 09-01-2008, 08:12 PM
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So if I set it up (ring gap for example), without running boost, would there be any negative affects on the motor?

Thanks guys.
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Old 09-01-2008, 08:21 PM
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Which engine are you planning on doing this to? I've got a 9.7:1 two bolt, cast crank 350 that I supercharged almost three years ago. I used a 142 ci Weiand blower and have it putting out 6 psi of boost. The only problem I have is that I cannot run straight pump gas with it.
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Old 09-01-2008, 08:21 PM
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BMM,

Ring mfr's give a number on a chart that has the intended use, (N/A, turbo, alcohol, nitrous, etc.) This number multiplied by the bore size is the number you should adhere to.

It's all about heat at the top ring land. As you know metal (rings) expands when hot. So it's up to you to gap them accordingly.

Build it tight for N/A NOW, then boosting later, is asking for it.

Lot's of boost= lot's of heat..
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Old 09-02-2008, 10:23 PM
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Aye, makes sense. Thanks guys. I guess if I build it Ill do it properely for N/A now, and worry about changing if I want to boost in the future.


Blazin, I gotta rebuild or do something with my stock 350 SBC. I dont know just what yet though.
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