Who's making 1,000 hp on a stock cast crank?
11-03-2010, 09:48 AM
#1
Staging Lane
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Who's making 1,000 hp on a stock cast crank? I'm putting together your typical 5.3L bored to 347 ci with stock manifolds, a T88, forged rods and pistons, yadda yadda. I can't decide whether to spend the extra $1,000 for a forged crank. I see lots of people making tons of power with a stock cast crank, but can it handle 900-1,000 flywheel hp? This motor going in a dedicated drag car, and will only turn 7,000 rpm at most. Assuming the tune is spot on, will a stock crank hold?
11-03-2010, 10:23 AM
#2
Not an LS crank, but it gets the point across...
http://www.insidetopalcohol.com/showthread.php?25424
Short version: Sure, it will take it, and more. The turbo won't stress your crankshaft as much as a 14-71 anyway.
In my very limited experience, the crank doesn't break, bearings spin, piston ring lands break, head gaskets fail... Despite my best efforts, I haven't been able to break a crankshaft in anything yet.
Of course, if your having a pro builder assemble an engine for you, he isn't going to like that idea at all, since it is an unknown... and doesn't allow him to mark up the price much..
I am sure that someone can find you a picture of a broken stock crank, but I can also show you a picture of a broken 4340 crank.
http://www.insidetopalcohol.com/showthread.php?25424
Short version: Sure, it will take it, and more. The turbo won't stress your crankshaft as much as a 14-71 anyway.
In my very limited experience, the crank doesn't break, bearings spin, piston ring lands break, head gaskets fail... Despite my best efforts, I haven't been able to break a crankshaft in anything yet.
Of course, if your having a pro builder assemble an engine for you, he isn't going to like that idea at all, since it is an unknown... and doesn't allow him to mark up the price much..
I am sure that someone can find you a picture of a broken stock crank, but I can also show you a picture of a broken 4340 crank.
11-03-2010, 10:43 AM
#4
Staging Lane
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That's good to hear. How much power have you been able to put through stock crank? I know both the 5.3Ls and 6.0Ls have 3.622-inch cranks, but are the castings different in any way that might impact strength? As cheap as 5.3L cores are, I figure I can go through 3-4 motors for the price of one forged aftermarket crank.
11-03-2010, 11:05 AM
#5
That's good to hear. How much power have you been able to put through stock crank? I know both the 5.3Ls and 6.0Ls have 3.622-inch cranks, but are the castings different in any way that might impact strength? As cheap as 5.3L cores are, I figure I can go through 3-4 motors for the price of one forged aftermarket crank.
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11-04-2010, 05:58 AM
#11
On The Tree
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Camaroandreas made a lot of hp with stock crank
https://ls1tech.com/forums/forced-in...lbs-today.html
https://ls1tech.com/forums/forced-in...lbs-today.html
11-04-2010, 05:03 PM
#13
Mike Brown made 1000rwhp+ with an LS2 alum block (stock), stock LS1 crank, good rods/pistons and some AFR 225's with LS6 intake. He went mid 8's I believe.
There are plenty of people that have made 1000hp+ with them. You really don't find any threads of anyone breaking a crank either! They are stout for sure.
There are plenty of people that have made 1000hp+ with them. You really don't find any threads of anyone breaking a crank either! They are stout for sure.
11-04-2010, 07:36 PM
#14
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There are guys runinng mid low 9's on stock bottom ends. Are they pushing the hell out of the motors, yes but the crank is by no means the weak link. If you are building a nice setup that you plan to run for a few years buy a crank. If this is a stepping stone motor until you decide what you want and plan to step it up in the future just run a stock crank for now.
11-04-2010, 10:50 PM
#15
That's good to hear. How much power have you been able to put through stock crank? I know both the 5.3Ls and 6.0Ls have 3.622-inch cranks, but are the castings different in any way that might impact strength? As cheap as 5.3L cores are, I figure I can go through 3-4 motors for the price of one forged aftermarket crank.
the 5.7 crank in the camaro & vette I would be a weaker component giving that it is lighter & drilled from factory.
11-05-2010, 02:51 PM
#18
TECH Apprentice
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Any of those rads. will work. It all boils down to the fans. If you have some fans that actually move some air, you won't have any problems. I see a lot of people use the thin *** spal fans because they're slim. But they don't move enough for some combos. I've never had a cooling issue, even in FL summer with the air on. But my fans pull 4000cfm.
