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crankshafts on nos
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TSHACK
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PostPosted: Sun Dec 16, 2007 11:06 pm    Post subject: crankshafts on nos Reply with quote

I was just reading an article in the latest Car Craft. The writer states that they found that a cast crank will hold up to 250 HP shot (it reads like repeatedly). That seem a bit much what do you folks think.
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Big Dave
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PostPosted: Mon Dec 17, 2007 12:19 am    Post subject: Reply with quote

I do not doubt it. How long did they run it, two pulls?

Surviving a race, maybe two is not a cost effect system unless you have access to a nearly unlimited supply of junk 350 motors like I do in Tampa (we ship scrap metal from the whole east coast to far east from Black Point in Tampa). You can buy a 350 Vortec rebuilder for the price of scrap metal so a friend (more of an acquaintance actually, works in a speed shop I frequent) of mine blows one up a week. He runs a 250 horse shot on stock GM parts and gets six to nine races before they puke all over the public roads he runs on. (Drives a 1986 Seafoam green Buick Skylark if you should happen to meet him).

He spends his lunch hour everyday swapping parts so that he has a "fresh" motor ready for Friday night. His total investment, time to swap a cam and grind a head port or two (should he loose a head).

Big Dave


Last edited by Big Dave on Mon Dec 17, 2007 3:52 pm; edited 1 time in total
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TSHACK
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PostPosted: Mon Dec 17, 2007 12:26 am    Post subject: Reply with quote

Shocked WOW sounds fun I'd love to change a motor out every week Exclamation That sound like as much fun as getting hit in the head with a stick. Twisted Evil Oh Crap I better not list my other hobbies.
How long would a forged GM 350 crank hold up to 250 HP shots

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clay
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1972 Chevrolet Nova

PostPosted: Mon Dec 17, 2007 5:44 am    Post subject: Reply with quote

If you did something to help minimize the intial shock like a progressive controller or even a two stage system, I would guess quite a while. Nitrous makes more torque than h.p., so you could keep the rpm's somewhat conservative. Just make sure to run plenty of octane and watch the timing - just cover the basics and it should last a while. I don't have a number of passes or anything, but it should be a pretty strong piece. Clay
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Mon Dec 17, 2007 7:31 am    Post subject: Reply with quote

i have a stock crank (one piece rear)
this up coming summer im starting with a 125 shot we will see how long it will last on that
let alone progressively upping to a 200 shot at most
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af2
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1933 Willys Coupe

PostPosted: Mon Dec 17, 2007 3:52 pm    Post subject: Reply with quote

I think Big Dave said it: 2 pulls. I wouldn't even think(sorry Clay) of running a cast crank past 7000 NA much less ad N02 or Induced. Laughing (blown in case you don't understand) Laughing
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clay
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PostPosted: Mon Dec 17, 2007 6:29 pm    Post subject: Reply with quote

In his second post he said a GM forged crank which I would think would be pretty decent. I agree with af2 on the cast crank thing, although I have done different, I realize they are a crap shoot with longevity. Clay
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96capriceMGR
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1996 Chevrolet Caprice

PostPosted: Mon Dec 17, 2007 6:35 pm    Post subject: Reply with quote

What do you call cast and what year are we talking. The late model nodular iron one piece cranks are STOUT, talking about a 70s era cast cank and I would sooner use a $200 Scat.

The latemodel cranks like the LT1 crank I would not hesitate to put 250 through if the motor was say just 400fw NA, pistons and rods are of MUCH greater concern.
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af2
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1933 Willys Coupe

PostPosted: Mon Dec 17, 2007 7:18 pm    Post subject: Reply with quote

96capriceMGR wrote:
What do you call cast and what year are we talking. The late model nodular iron one piece cranks are STOUT, talking about a 70s era cast cank and I would sooner use a $200 Scat.

The latemodel cranks like the LT1 crank I would not hesitate to put 250 through if the motor was say just 400fw NA, pistons and rods are of MUCH greater concern.


I hate to disagree but I'll take a forged crank any day over any cast available. The nodular is stronger than cast also!

That sounded tough and was not meant to be. It is a fact I believe and that is all.
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96capriceMGR
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1996 Chevrolet Caprice

PostPosted: Mon Dec 17, 2007 9:14 pm    Post subject: Reply with quote

My experiabce is pretty much limited to the 90s LT1s and from what I have seen those 90s era nodular iron cranks are STOUT and they are dirt cheap and I would sooner have a stocker like this reground than use a $200 cast, but at the same time I see a fair number of LT1 guys using the $180-230 Scat stroker cranks with good reliability, our pcm limits us to little over 7000rpms though and that may be a piece of it. Guys who try and use them with blower have problems though, nose can't handle it.

Metallurgy has come a long ways in recent decades.

On the otherhand, the $200 difference between basic cast and forged is peanuts in a build you expect to last years.

From what I have seen I would buy Scat before Eagle, seems like more QC issues on the Eagle side though some guys have exlellent results.

Ideally though I would use Compstar, not cheap but a great value for what you get.
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TSHACK
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PostPosted: Mon Dec 17, 2007 10:48 pm    Post subject: Reply with quote

The article was using an early Amc Rambler engine. But for me I have a late 70's 4 bolt 350 block ( 2 part seal) With a ported out, set of heads from a 300 hp 350. It seems to me the casting # was 446. Thats why I was thinking my old forged crank that in there should work.
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Tue Dec 18, 2007 2:23 am    Post subject: Reply with quote

lets not get away from the saying "you get what you payed for"

if your stock crank "goes" it will shatter in a million pieces
if i had a "race" motor id put in one helluva stout crank in it
loose oil press. and you might save the rest of the motor
turns out i have fun on the street and the track (my engine in the t/a is cheap just good fasteners)
i can be a test bed for these weak pieces and nos applications im guessing it will not last long even at 125 shot over and over and over again

im amazed at the circle track guys (the cheaper classes)hitting 7000 rpm time and time again retard
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wagon train
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1983 Mercury Capri

PostPosted: Wed Dec 19, 2007 12:45 am    Post subject: Reply with quote

Its not as much horsepower as it is DETONATION!
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William Jones
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1971 Ford Mustang

PostPosted: Wed Dec 19, 2007 2:26 pm    Post subject: Reply with quote

Spend the money on a crank take it from me. If you check out my post were my crank came out of the oil pan. It was a cast Scat 9000 but it was machined in properly as wagontrain pointed out.

later Bam

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TSHACK
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PostPosted: Sun Dec 23, 2007 9:38 pm    Post subject: Reply with quote

So any suggestions for a good budget crankshaft, that could take 250HP shots of nos (not every run). This would go in to my 350 Chevy W/ the two part rear seal.
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