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Brand new motor and broke crank

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Old 04-06-2008, 10:12 AM
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Default Brand new motor and broke crank

Just to releave some steam i thought i would share this **** with everyone. I reasently had my 370 built to with stand alot of nitrous, price was not a issue so after spending almost $8k on everything i now have a broke crank Not sure how that happend, its only been started once for about 10 min to make sure everything was alright. Car ran fine on my old tune no knocks no loud sounds, tell yesterday i went to go start the car only to realize the flywheel is turning with the starter but the motor is not? **** sucks but now i will have to pull it again to put another crank in it and check everything else. So anyone have a crank for sale?
Old 04-06-2008, 11:45 AM
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YOU BROKE THE CRANK?!?!
Even the factory LS1 crank can take 1000hp and then it might start to flex!
Old 04-06-2008, 04:03 PM
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Originally Posted by forged370
Just to releave some steam i thought i would share this **** with everyone. I reasently had my 370 built to with stand alot of nitrous, price was not a issue so after spending almost $8k on everything i now have a broke crank Not sure how that happend, its only been started once for about 10 min to make sure everything was alright. Car ran fine on my old tune no knocks no loud sounds, tell yesterday i went to go start the car only to realize the flywheel is turning with the starter but the motor is not? **** sucks but now i will have to pull it again to put another crank in it and check everything else. So anyone have a crank for sale?
I would say you have a flywheel issue. The crank would have to broke at the very rear flange to not even turn over any cylinders. And like stated above even a stock crank is plenty strong. Check the flywheel first.
Old 04-06-2008, 05:32 PM
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Originally Posted by forged370
Just to releave some steam i thought i would share this **** with everyone. I reasently had my 370 built to with stand alot of nitrous, price was not a issue so after spending almost $8k on everything i now have a broke crank Not sure how that happend, its only been started once for about 10 min to make sure everything was alright. Car ran fine on my old tune no knocks no loud sounds, tell yesterday i went to go start the car only to realize the flywheel is turning with the starter but the motor is not? **** sucks but now i will have to pull it again to put another crank in it and check everything else. So anyone have a crank for sale?
how do u know if the crank is broken-

is the engine out of the car? if so can u see for yourself to say its a broken crank
if not how do u know?

Nick---
Old 04-06-2008, 06:35 PM
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^ I can't fous on this thrwad because I'm too busy being mesmerized by your avatar
Old 04-06-2008, 07:18 PM
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Originally Posted by Kingc8r
^ I can't fous on this thrwad because I'm too busy being mesmerized by your avatar
X2 But seriously now dont get pissed till you take it apart. If your working while your pissed you might miss somthing. Im real sorry to hear about that I can only imagine what your going through.
Old 04-06-2008, 09:07 PM
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maybe the starter solenoid is just screwed up and the teeth aren't engaging the flywheel...???
Old 04-06-2008, 09:40 PM
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I'll bet ya it's something simple. It usually is...
Old 04-07-2008, 01:14 AM
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flywheel bolts sheared
Old 04-07-2008, 07:20 AM
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probably the ring gear pressed onto the flywheel came loose

new fancy flywheel on the engine reinstall?
Old 04-07-2008, 03:15 PM
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sounds like your flywhell took a dump on ya no tthe crank, i bet its sheered the bolts off. ive done it a frw times w/ older smc motors.
Old 04-07-2008, 07:37 PM
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I'm no expert but that sounds nothing like a broken crank. Start at the starter and work your way around to the crank, you'll find it.
Old 04-07-2008, 11:35 PM
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Yea i know now that its not the crank, but at the time i was pissed and was thinking the worst. Im sure its the flywheel bolts sheered or something to do with the flywheel. Thanks guys for the comments ill be taking it out sat.
Old 04-08-2008, 07:11 AM
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Originally Posted by forged370
Yea i know now that its not the crank, but at the time i was pissed and was thinking the worst. Im sure its the flywheel bolts sheered or something to do with the flywheel. Thanks guys for the comments ill be taking it out sat.
I assume you are pulling the trans? Its going to be much quicker.
Old 04-08-2008, 04:54 PM
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Same thing hapened to me... Starter just spins flywheel. Removed lower cover on bell housing and I can spin flywheel by hand. But it will not move around prying on it.
Kinda knew what happened when I was comming out of corner on the gas then popin and sputtered then silence.. As I was coasting back to pits was thinking the crank broke right in front of reluctor ring (poppin then died)
I have broken flywheels before and the engine will keep running sometimes..




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