Has anyone had an success re-using a crankshaft thats' spun a bearing?

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Originally Posted by steve68

Sometimes when a crank has spun a bearing, the crank ends up cracking.
A "pro" will magnaflux the crank to test for cracking. If it's not cracked, then it can be reground. If it's cracked and reground then it will fail almost immediately.
No 6G72 factory cranks are nitrided nor are any of them forged. They're all cast. There's a difference though between cast iron and cast steel.
The crank in my car now is a 2nd gen one, it was reground and then nitrided some 10 years ago, it's been in several blocks now, has survived a stuck piston which broke a conrod and is still running without problems. It's all to do with the workmanship on the regrinding.
Cast cranks will crack before they bend, forged cranks will tend to bend before they crack, just as conrods do.

Steve

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Are you serious?
No 6G72 cranks are forged? Seriously?

Have you ever seen a 1993 or newer 6G72 crank? Or any one purchased from a dealer now?
If none of them are forged, and all of them are cast, answer this: Why is the forge line in the newer (than 1992) crank wide and wavy and meandering like a forged line not a cast line? I would like to see that cast form that produces the wavy and wide "cast" line in the newer cranks.

-Chris

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Originally Posted by Roy

EDIT: Damn beer, made a typo in the title and I can't edit it. herp derp derp.

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ROFLOL! I messed up my scale model last night drinking and thinking i knew better than the instructions :D

@Steve68, put a sock in it, you have no clue what you are talking about

Ive never used a reground crank before, the margin for error is too small, if its not done right in the smallest, youre basically screwed and risk of damaging the block

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Originally Posted by steve68

No 6G72 factory cranks are nitrided nor are any of them forged. They're all cast. There's a difference though between cast iron and cast steel.

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Take a look at one sometime. I have both a cast crank and a forged crank in my garage, the differences are obvious.

http://roycormier.net/images/20qi89e.gif

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Originally Posted by steve68

I didn't say that they're not different, they're not forged, same as the 74 cranks aren't forged (I've got 3 of them) and the 4G63 cranks aren't forged.
I've also spent some time recently regrinding cranks on a crank grinding machine so it's probably fair to say that I've seen more cranks than a lot of other people on here.
Generally you'll only find a forged crank in a race only motor, the reason being that they're stronger and less likely to crack. A cast crank is always more durable as the grain structure in a cast crank gives a better bearing surface, holds oil better and wears less. That's straight out of books too rather than the usuual internet BS.

Anyway, forged cranks, hydraulic lifters, hydraulic tensioners, they go hand in hand with cambelts for 13B rotaries.
They're just words used wrongly by people who don't know any better.

Steve

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quote, so that your lunacy may shine for all time. no need to comment about the HP limitations for cast cranks.

"teh cast crank can nevar lose!!!!"

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Originally Posted by steve68

I didn't say that they're not different, they're not forged, same as the 74 cranks aren't forged (I've got 3 of them) and the 4G63 cranks aren't forged.
I've also spent some time recently regrinding cranks on a crank grinding machine so it's probably fair to say that I've seen more cranks than a lot of other people on here.
Generally you'll only find a forged crank in a race only motor, the reason being that they're stronger and less likely to crack. A cast crank is always more durable as the grain structure in a cast crank gives a better bearing surface, holds oil better and wears less. That's straight out of books too rather than the usuual internet BS.

Anyway, forged cranks, hydraulic lifters, hydraulic tensioners, they go hand in hand with cambelts for 13B rotaries.
They're just words used wrongly by people who don't know any better.
Steve

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Stop posting dude, youre embarassing yourself, its really sad. Also please refrain from giving people wrong "advise"

Who knew this thread would turn to comedy....? :lol:

Im done here,

Steve68, all the good luck to you building your car.

PS. Read this: 3SX Performance - 3000GT / Stealth Cast versus Forged Cranks*-*Mitsubishi 3000GT*/*Dodge Stealth Parts

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Originally Posted by steve68

Spanish "tuner". Enjoy - Page 2 - Mitsubishi Lancer Register Forum

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I read that thread years ago, its AMAZING! Definitely good for some laughs.