opinion: If you could only have one - steel crank or 4 bolt??? - Team Camaro Tech
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post #1 of 18 (permalink) Old Aug 13th, 08, 08:58 AM Thread Starter
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opinion: If you could only have one - steel crank or 4 bolt???

I read an interested post that got me realizing that 2 bolt mains can handle a lot more HP than I though in a BBC. I know that both would be ideal, but I'm wondering what would be the best for handling a little higher HP if you could only have one......a steel crank in a 2 bolt main BBC or a cast in a 4 bolt??? Thanks!


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post #2 of 18 (permalink) Old Aug 13th, 08, 10:41 AM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

Yeah, you're right. Weird question.

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post #3 of 18 (permalink) Old Aug 13th, 08, 11:24 AM
 
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Re: opinion: If you could only have one - steel crank or 4 bolt???

It would depend on what kind of power you are talking about.
I made 720hp on a cast crank and a two bolt block. The motor had 100 to 150 runs with no probs. So there ya go. I like the cast crank, because it has a little give in it where a steal crank will break. But again, it depends on the amount of power you are going for...
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post #4 of 18 (permalink) Old Aug 13th, 08, 12:18 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

I have see both types break. The difference is when the steel one went it bent and twisted first ...taking the block with it.
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post #5 of 18 (permalink) Old Aug 13th, 08, 01:32 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

i talked to a drag racer before, and he told me that if you have a crank bust, or anything happen to the engine, a 2 bolt will fail just as much as a 4 bolt will

i would get a better crank and leave the 2 bolt

basically, if you put a cheap crank in, it explodes it is going to take out the 4 bolt mains as well as it would a 2 bolt
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post #6 of 18 (permalink) Old Aug 13th, 08, 03:36 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

From experience, I would say a Forged Crank in a 2 Bolt Block with Studs should deliver a dependable 650 to 700 Hp.

I've run a Cross Drilled Cast BBC Crank at 6200 to 6500 rpm with approx 550Hp in a 2 Bolt Block without problems and actually prefer the lighter faster revving quality of the Cast Crank over the Heavier Forging for that 450 to 550 Hp range.

A BBC Revving anything over 7000rpm will destruct just as fast whether you're running a 2 or 4 bolt.

Just how many times do you rev that BBC over 6000rpm. Once you pass that 5000rpm mark, you have already broken the Law - LOL

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post #7 of 18 (permalink) Old Aug 13th, 08, 03:40 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

I would say forged in a studded 2 bolt. But if you are spraying it, get a forged one.

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post #8 of 18 (permalink) Old Aug 13th, 08, 04:03 PM Thread Starter
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Re: opinion: If you could only have one - steel crank or 4 bolt???

It's sounds like what you all are telling me is that my motors aren't producing enough power to even worry about it!!!!!!!!!!!!!!!!!!

LMAO


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post #9 of 18 (permalink) Old Aug 13th, 08, 05:23 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

A 2 bolt main BBC, with horsepower ratings up too 350 HP and revs no higher than 5500 rpm, can use either a forged or cast crank, anything higher than 5500 rpm should have 4 bolt mains and forged cranks.
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post #10 of 18 (permalink) Old Aug 13th, 08, 05:40 PM
 
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Re: opinion: If you could only have one - steel crank or 4 bolt???

Look, imho, you get up to 700hp w/ a stock block, SB and regardless, imho, it's going to start splitting down the V.

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post #11 of 18 (permalink) Old Aug 13th, 08, 05:56 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

Quote:
Originally Posted by pdq67 View Post
it's going to start splitting down the V.

It won't with a pair of "cracker straps", designed for the V-8 engine!
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post #12 of 18 (permalink) Old Aug 13th, 08, 05:58 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

Quote:
Originally Posted by pdq67 View Post
Look, imho, you get up to 700hp w/ a stock block, SB and regardless, imho, it's going to start splitting down the V.

pdq67
He's asking about a Big Block.

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post #13 of 18 (permalink) Old Aug 13th, 08, 06:12 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

I would not put a cast crank in anything, also I have never seen an engine let loose at the mains(2 or 4 bolt). I have a forged crank internally balanced 2 bolt main 427 that revs to 7000rpm without a hitch. Just get a good set of arp main bolts.

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post #14 of 18 (permalink) Old Aug 13th, 08, 08:29 PM
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Re: opinion: If you could only have one - steel crank or 4 bolt???

Nine catastrophic failures in ten, something above the crank lets go,..usually the valve train in a BB.

FWIW
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post #15 of 18 (permalink) Old Aug 14th, 08, 10:02 AM
 
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Re: opinion: If you could only have one - steel crank or 4 bolt???

What HP are you looking for or what 1/4 mile ET do you have in mind?
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