LT1-LT4 Modifications 1993-97 Gen II Small Block V8

383 Motor Failure. FML

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Old 11-04-2011, 01:01 AM
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Originally Posted by the_merv
Eagle Cast Cranks are garbage..the Forged ones are good..4340 is a little better than chinese cast junk.
This!!
Old 11-04-2011, 01:12 AM
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Well, it will definitely get a forged crank. I'm just not sure what crank specifically was in there, and what that would translate to in a forged crank.
Old 11-04-2011, 01:47 AM
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If it's a 383 you need a forged 3.75 Crank..
Old 11-04-2011, 02:57 AM
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For sure? I'm not to familiar with sizing cranks at all. I'm a first time Chevy anything, and this is my first V8 car. I was usually a turbo 4 kind of person

Not only that, but when I look up parts, its asking me for the rod length?

Last edited by Quazz; 11-04-2011 at 03:07 AM.
Old 11-04-2011, 03:00 AM
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So in other words... something along these lines:

http://www.summitracing.com/parts/ESP-435037505700/

EDIT

I think it has a one piece rear main... I think... so that crank but the 1 piece RMS version.
Old 11-04-2011, 04:20 AM
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If the crank pulley is wobbling, then I'll guarantee the crank is snapped just behind/under the front main. That's where mine broke.

And I am honestly surprised that after your Eagle cast crank broke that you'd consider anything Eagle in the future. That would personally be my last choice.
Old 11-04-2011, 05:08 AM
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I had a eagle cast in my engine at first. I Did some research. Never even installed the oil pan or the heads took it back to the builder and had a Callies installed. Wasnt worth the cost to let it completely destroy everything!
Old 11-04-2011, 07:45 AM
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Originally Posted by Cooldude5231
sounds to me like someone just slapped a motor together
i was gonna build a 383
but they never stay together.
^the hands down most rediclious thing ive read on LS1 Tech this month.........

Originally Posted by Quazz
Yup, eagle cast. Once i find out what the specs are, what manufacturer should i go with for a new crank.??
Eagle Cast cranks are absolute garbage......sorry.........i would never run one in any motor i build......if i go cast its either a stock GM crank or a Scat 9000 crank......thats all i will use for cast cranks

Originally Posted by vtec
broke crank. put the stock crap back in it.
agreed........i spun a stock crank stock rod/(ARP BOLT) combo 7000rpm for 4 years when i had my 355.....

Originally Posted by vtec
why fail?

because is chinese.


Originally Posted by the_merv
Eagle Cast Cranks are garbage..the Forged ones are good..4340 is a little better than chinese cast junk.
yuppp
Old 11-04-2011, 07:46 AM
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The Eagle forged stuff sometimes needs machining to make dimensionally correct before installation but they don't break the way the cast ones do. YEARS ago the Eagle cast were popular and worked OK but in recent years HP numbers are easier to come by and something seems to have gone wrong QC wise with Eagle and in recent years their cast cranks have been failing pretty easily.

Eagle seems to be easily the most popular brand of cranks but only because they were cheap which built popularity and now that popularity is just self sustaining. You can buy better stuff for similar money. The Howards Tracksmart are made in America by Callies similar price to the chinese stuff.
Old 11-04-2011, 07:57 AM
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Originally Posted by 96capricemgr
The Eagle forged stuff sometimes needs machining to make dimensionally correct before installation but they don't break the way the cast ones do. YEARS ago the Eagle cast were popular and worked OK but in recent years HP numbers are easier to come by and something seems to have gone wrong QC wise with Eagle and in recent years their cast cranks have been failing pretty easily.

Eagle seems to be easily the most popular brand of cranks but only because they were cheap which built popularity and now that popularity is just self sustaining. You can buy better stuff for similar money. The Howards Tracksmart are made in America by Callies similar price to the chinese stuff.
^

on budget motors i run scat and howards lower end stuff.......but i reccomend my customers run the callies compstar stuff.......great price......great product......great company.....and the best part made in the good ole
Old 11-04-2011, 08:05 AM
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Compstar is forged overseas and machined here, nice middle ground BUT I believe they axed the 1-piece rear main cranks from their catalog. Of course you can run an adapter.
Old 11-04-2011, 08:12 AM
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Originally Posted by 96capricemgr
Compstar is forged overseas and machined here, nice middle ground BUT I believe they axed the 1-piece rear main cranks from their catalog. Of course you can run an adapter.
yep moroso $79 problem solved........im running one on my car for my crank.......callies wanted an extra $300 to machine a magnum crank with a one piece seal
Old 11-04-2011, 08:35 AM
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Before I'll go hating on Eagle or any other CAST crank manufacturer there is one very important bit of info here. The crank was neutral balanced and the weight was left on the flex plate. That will.....absolutely introduce harmonics into the rotating assembly that are hard to overcome. A stock cast crank or any cast cran would have failed in that unfortunate situation.

By definition cast iron or cast steel will be brittle because of the increased carbon content. Brittle things don't like harmonics. If properly balanced a cast crank can make over 500 HP. If improperly balanced they can fail at 200 Horsepower. I'm not sure the fault was Eagle but from the original post the fault lies with the builder for not doing his job.
Old 11-04-2011, 08:38 AM
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Originally Posted by 1963SS
Before I'll go hating on Eagle or any other CAST crank manufacturer there is one very important bit of info here. The crank was neutral balanced and the weight was left on the flex plate. That will.....absolutely introduce harmonics into the rotating assembly that are hard to overcome. A stock cast crank or any cast cran would have failed in that unfortunate situation.

By definition cast iron or cast steel will be brittle because of the increased carbon content. Brittle things don't like harmonics. If properly balanced a cast crank can make over 500 HP. If improperly balanced they can fail at 200 Horsepower. I'm not sure the fault was Eagle but from the original post the fault lies with the builder for not doing his job.
agreed
Old 11-04-2011, 08:49 AM
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i have an eagle forged crank in my motor. it was built back in 04, 396, daily driven for about a year and a half. car weighs 3800 and puts out 502 rwhp, the forged stuff seems good to me
Old 11-04-2011, 08:52 AM
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Good point 1963SS, but I won't let an Eagle crank within 10 yards of my cars.
Old 11-04-2011, 08:57 AM
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I have an Eagle 4340 Forged in my 408, been in it since 07..well balanced tho.
Old 11-04-2011, 10:58 AM
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Originally Posted by 96capricemgr
The Eagle forged stuff sometimes needs machining to make dimensionally correct before installation but they don't break the way the cast ones do.
Both my Eagle 4340 cranks needed a bit of work to get them balanced, now they are within 1 gram a bit overkill but no problems from them yet.
Old 11-04-2011, 11:13 AM
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Howards Tracksmart 4340 forged crank and 6" h-beam rods with Mahle forged ft pistons in my new build. I wouldn't bother wasting time on a cast crank for a stroker build, the extra $300-$400 you spend on the frontend (depending on whose 4340 forged crank you buy) will save you alot more money later when the cheap **** blows up or brakes and takes out everything else with it.
Old 11-04-2011, 11:29 AM
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This is a bit off topic but do you guys suggest balancing a stock crank, stock rods 355?


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