Stock Crank Limitations
Stock Crank Limitations i cant find a number. all i read is "it will handle alot""it is strong enough". thimgs like that. but at what rwhp does the stock crank become an issue? will it handle 500rwhp plus a 150 shot, assumimg all else is forged and correctly built? when is a forged crank actually necessary?
i cant find a number. all i read is "it will handle alot""it is strong enough". thimgs like that. but at what rwhp does the stock crank become an issue? will it handle 500rwhp plus a 150 shot, assumimg all else is forged and correctly built? when is a forged crank actually necessary?
When is a forged crank necessary? When you can't afford to rebuild another motor when the stock one breaks.
Thats an affirmative and I can't think of a single failure that Ive seen where a flexing stock crank causing another failure. I do have 2 aftermarket 4340 cranks that have cracks in them.
RPM is usually a killer of cranks before power.....
I think the reason you haven't seen alot of stock crank failures is because not many ppl are using them much past 600 or so hp......
I mean if you use the stock crank you're pretty much limited to >360ci or so..... most want to stroke their motors to 383 or 396 so the stock crank is out...
I think the reason you haven't seen alot of stock crank failures is because not many ppl are using them much past 600 or so hp......
I mean if you use the stock crank you're pretty much limited to >360ci or so..... most want to stroke their motors to 383 or 396 so the stock crank is out...
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But your 500rw + the 150 shot maybe be walking on thin ice. Especially if your going to be doing it on a regular basis. 650-675rw is quite a bit for a cast crank in my mind.
What kind of rpm are we talking here?
I agree with outlaw, that alot of the big power guys are strokers, there for they ditched the stocker, but none the less I still dont know of a single factory crank letting go.
there is no true figure to this seeing your crank could of been beat on its whole life and seen high rpms..or could of been babyed
now ive seen bbc stock cranks make over 1000hp,i had a 1969 327 2 bolt main engine and i only put trw pistons in it with arp **** and made around 750hp with 150 shot..ive read people taking gen 1 350s and going 900hp on stock cranks and blocks...theres the guy on here with the stock 6.0l making 1360hp on a stock crank an block with a turbo...the newer cranks are better forgeings from the 60s and early 70s..so could your crank take it yeah probley..how long..well you will only get that answer when you got rods out the side of the pan
now ive seen bbc stock cranks make over 1000hp,i had a 1969 327 2 bolt main engine and i only put trw pistons in it with arp **** and made around 750hp with 150 shot..ive read people taking gen 1 350s and going 900hp on stock cranks and blocks...theres the guy on here with the stock 6.0l making 1360hp on a stock crank an block with a turbo...the newer cranks are better forgeings from the 60s and early 70s..so could your crank take it yeah probley..how long..well you will only get that answer when you got rods out the side of the pan
it comes down to "what can your wallet handle?????"
If you put a stock crank in it and wanna push 500,600, or 700 hp do it.... It PROBABLY will be fine....
but be forewarned that IF a crank lets go at speed it is going to take out EVERYTHING. It'll most likely crack the block, destroy the crank itself, rods will be twisted as ****, pistons are gone... so if you can handle a complete motor explosion and still sleep at night try it out...
If you put a stock crank in it and wanna push 500,600, or 700 hp do it.... It PROBABLY will be fine....
but be forewarned that IF a crank lets go at speed it is going to take out EVERYTHING. It'll most likely crack the block, destroy the crank itself, rods will be twisted as ****, pistons are gone... so if you can handle a complete motor explosion and still sleep at night try it out...
well its a daily driver and my only car. i was pushing the figures a bit just to make sure. im just trying to see if i can build a budget forged 355 and get away with that much power if i wanted to
I don't think I could ever DD my T/A again; especially not when I get the engine built. I like to have too much fun with it and I know that equates to broken things all the time.
Staging Lane
Joined: Jan 2010
Posts: 89
Likes: 0
From: Woodlawn IL
My car must be really be in left field, I have a 398 with all the best parts in it a set of afr 210 heads on it with extra work, Intake done by hand at Lingenfelter, the same cam that is in one of the fastest lt1 cars in the country (he is on this board if he wants to give you the specs he can post them but I am not going to), step headers with port plates and merge collectors,vacuum pump, low tension rings, lightweight everything, and just about every trick in the book, tuned on Ed Wrights dyno by Ed and I am just now getting to/past those kinds of numbers. If you dont mind sharing some info on how to do this with 355 cubic inches on a budget I will thow mine in a scrap bin and start over.
Thanks in advance for the help
Rob
Last edited by Doughboy692; Jan 21, 2010 at 09:37 PM. Reason: spelling
uh. i said i was pushing the numbers. i was actually hoping for around 450 through a 6 speed with an Ai top end.
calm down a little man, it was just a simple question about how much the stock crank will handle. not trying to compete with anyone for knowledge here
p.s. Ai's web site lists a 355 that makes 1012rwhp with a turbo and GM heads
calm down a little man, it was just a simple question about how much the stock crank will handle. not trying to compete with anyone for knowledge here
p.s. Ai's web site lists a 355 that makes 1012rwhp with a turbo and GM heads
Staging Lane
Joined: Jan 2010
Posts: 89
Likes: 0
From: Woodlawn IL
uh. i said i was pushing the numbers. i was actually hoping for around 450 through a 6 speed with an Ai top end.
calm down a little man, it was just a simple question about how much the stock crank will handle. not trying to compete with anyone for knowledge here
p.s. Ai's web site lists a 355 that makes 1012rwhp with a turbo and GM heads
calm down a little man, it was just a simple question about how much the stock crank will handle. not trying to compete with anyone for knowledge here
p.s. Ai's web site lists a 355 that makes 1012rwhp with a turbo and GM heads
Big difference in what needs to be done to pack air in a cylinder with a turbo and trying to suck it in naturally. Just saying.
The stock crank in a lt1 is pretty tough just make sure you have it magged to ensure you are starting with a good part before machine work because 450 at the rollers is likely to be upwards of 550 at the flywheel.
Last edited by Doughboy692; Jan 21, 2010 at 10:26 PM. Reason: spelling, added to post