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Discussion Starter · #1 ·
So I finally was able to tear down my failed engine. The crank broke at the oil pump. Looks like a twisted tootsie roll lol. The heads look ok so that’s always a plus. The pump will be sent out MMR for inspection. The heads will be gone through for sure as well.

pretty sure I was at least or close to 1K crank HP….
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Discussion Starter · #5 ·
What crank was that...just the 'standard' forged crank?
Yes sir that standard forged crank. It was a JLP built shortblock. The heads where CNC ported and gone through Fox Lake Racing.

For the most part the engine was really healthy. Hell the engine didn’t even have blow by! Oil was always nice and clean.

I believe the failure was do to being pulleyed to the moon… 3/10 combo plus elevation.. the crank gave out at a 15-20MPH WOT pull. Downshifted hard and snap!
 

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Discussion Starter · #6 ·
Is it me or does that crank look like it's seen some fucking heat?
Heart meaning overheating the engine? It’s possible. One time my damn Efan did not come on while parked and warming up… never had an overheating problem with this truck other than that one occurrence like 2 years ago…
 

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Discussion Starter · #7 ·
Heads are ok you say? Looks like you had some valve contact!
Yes very slightly on some valves… but luckily nothing broke off and no major damage!! Very happy with that. Even the billet oil pump (MMR Hurricane) looks to be ok but will be sending it out to MMR
 

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Stock Block [email protected]
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Wow!!! I put a Cobra Jet in mine, not that it will prevent that kind of damage.... but who knows..... well good luck getting her back together....
 
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Discussion Starter · #9 ·
Wow!!! I put a Cobra Jet in mine, not that it will prevent that kind of damage.... but who knows..... well good luck getting her back together....
Thanks man the truck is actually currently up and running! Bought another built engine the next week. Not built as powerful as my last engine but it will do for now!
 
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10 second street truck
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Heart meaning overheating the engine? It’s possible. One time my damn Efan did not come on while parked and warming up… never had an overheating problem with this truck other than that one occurrence like 2 years ago…

No. The front of it looks like it got very hot. I'm curious if there was an oil pressure issue that caused it or if when the crank broke and damaged the oil pump it spun long enough to heat the crank from lack of oil.
 

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Discussion Starter · #12 ·
No. The front of it looks like it got very hot. I'm curious if there was an oil pressure issue that caused it or if when the crank broke and damaged the oil pump it spun long enough to heat the crank from lack of oil.
The engine completely stopped after the failure. Will have to see what mmr says about pump
 

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Well at least you’re fast enough to break shit hahaha
 
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This type of failure is why Ford drilled deeper into the snout for the cobrajet crankshaft. The deeper hole transfers the stresses further into the crank and out of the weak snout area. I had my stock crank machined to accept a cobrajet bolt.

Sent from my SM-G998U using Tapatalk
 

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This type of failure is why Ford drilled deeper into the snout for the cobrajet crankshaft. The deeper hole transfers the stresses further into the crank and out of the weak snout area. I had my stock crank machined to accept a cobrajet bolt.

Sent from my SM-G998U using Tapatalk
Yep. Had my stock crank drilled for the ARP AQ4.100-1LB stud, AQW10M washer and AQN12-1 nut.
 

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2.9 Whipple E85R A1 Transmission
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For those who are wondering about the crack stud...

 

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This is my biggest fear swinging my 11" lower. Crank stress is magnified with the larger circumference. And I would hate to ruin my GT block that is not easily replaced. Next build will have a billet crank, but that is going to cost...

Jim
 
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