Forged Crank Questions
Thread Starter
Staging Lane
Joined: Sep 2003
Posts: 54
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From: No. Cal
Forged Crank Questions Would anybody building an FI motor get only forged pistons and rods and not the crank. I see lots of engine packages without forged cranks. Seems like you'd want the WHOLE bottom end forged. Just curious because I wanna run more boost someday.
Matt,
You still running factory main caps? Is the engine in the car still the one from Thunder last year when you had the stick?
Kurt
You still running factory main caps? Is the engine in the car still the one from Thunder last year when you had the stick?
Kurt
Originally Posted by y2khawk
20 psi, stock crank here 
Yes, and Yes.
Someone has to find their limits. LOL
It's actually still the same crank from 2 years ago when it went 10.doh at Thunder. The block on the other hand had some issues with solid motor mounts and cracking of the cylinder liners. So new main caps came with a new block.
How long you think it'll last??
Someone has to find their limits. LOL
It's actually still the same crank from 2 years ago when it went 10.doh at Thunder. The block on the other hand had some issues with solid motor mounts and cracking of the cylinder liners. So new main caps came with a new block.
How long you think it'll last??
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With a auto trans it should last longer.
If you add steel main caps and alum rods that would increase its life. Not sure what will fail first. My guess would be if its catastrophic it will break a maincap first, crankshaft second. If you get more runs on it the oil pressure will probably slowly go down until it fails a main bearing. Are the bearings showing wear at the parting line yet?
I ran a steel cap forged crank engine at 850 flywheel hp that went 9.60 @3600 pounds with no distress in the mains and crank.
Right now your going over the falls in a barrell, some make it some don't!!
Good luck and keep testing those limits!!
Kurt
If you add steel main caps and alum rods that would increase its life. Not sure what will fail first. My guess would be if its catastrophic it will break a maincap first, crankshaft second. If you get more runs on it the oil pressure will probably slowly go down until it fails a main bearing. Are the bearings showing wear at the parting line yet?
I ran a steel cap forged crank engine at 850 flywheel hp that went 9.60 @3600 pounds with no distress in the mains and crank.
Right now your going over the falls in a barrell, some make it some don't!!
Good luck and keep testing those limits!!
Kurt
Originally Posted by y2khawk
Yes, and Yes.
Someone has to find their limits. LOL
It's actually still the same crank from 2 years ago when it went 10.doh at Thunder. The block on the other hand had some issues with solid motor mounts and cracking of the cylinder liners. So new main caps came with a new block.
How long you think it'll last??
Someone has to find their limits. LOL
It's actually still the same crank from 2 years ago when it went 10.doh at Thunder. The block on the other hand had some issues with solid motor mounts and cracking of the cylinder liners. So new main caps came with a new block.
How long you think it'll last??
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Brett Foote I had steel mains in there LONG ago. 1k miles later and 3 mains spun, needless to say i'll never be using that "shop" for any work again. Especially a line hone and cap install.
I've always had good looking bearings, no abnormal wear on the mains. Then again, i keep using blocks w/ the factory line hone and OE main bearings. I had some funky wear on the rods with the block that cracked liners. I bet the portion of the block forward of the solid mounts was flopping around like a wet noodle
I'm guesstimating we're already pushing the 1kHP mark at the flywheel on this one, at least based on the fuel consumption. It's got some left i'm sure, but i'll probably start a spare short block anyway
wouldn't wanna spit the motor 2 weeks before Thunder without a spare
I've always had good looking bearings, no abnormal wear on the mains. Then again, i keep using blocks w/ the factory line hone and OE main bearings. I had some funky wear on the rods with the block that cracked liners. I bet the portion of the block forward of the solid mounts was flopping around like a wet noodle
I'm guesstimating we're already pushing the 1kHP mark at the flywheel on this one, at least based on the fuel consumption. It's got some left i'm sure, but i'll probably start a spare short block anyway
wouldn't wanna spit the motor 2 weeks before Thunder without a spare 
15-17 psi over there, 746rwhp, with the stock crank just polished. Running stock caps and Federal Mogul bearings. Running ARP main studs. So far only one full pass did 136mph hopefully will routinely run in the 145mph range this fall.
