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Cast cranks are for .......

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.... cars with TORQUE CONVERTERS !

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Cast cranks are for .......

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.... cars with TORQUE CONVERTERS !

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And 48 inch mower decks.

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Dram,tell me something new.Why does a stock 360 crank hold 450 hp and not this cast crank?

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Because old stock cranks was not made in China!

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Just throwing this out there,....I've got an estimated 500-525 hp with my 4" CAST crank (mopar performance) with a pretty heavy bob wieght. Car is heavy (3350lbs). Has been together for about 7 years now. Runs 11.0's with automatic, and I just put a stick in it last year (still tuning), but hoping to run low 11's with the stick.

One time, I spun a rod bearing. Had the crank cut and they said that it was slightly bent, very slightly. They tried to straighten it, and the machine shop said that they couldn't believe how STRONG this crank was. They said it was about as strong as some (other makes) forged cranks they has seen.

Never had a problem with the crank! (340 mains, too)

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These days there is only a small difference in total engine cost to go forged. I suppose things were different years ago. At one time the cast stroker crank was the only thing available to people on a budget but that is no longer the case.

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The crankshaft was purchased in 2007, forged crankshafts were much more expensive than today.
and we thought we would hold less than 500 HP without problems.

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and we thought we would hold less than 500 HP without problems.

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Yeah, this cranks are supposed to handle 500hp with no problems...

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and we thought we would hold less than 500 HP without problems.

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Yeah, this cranks are supposed to handle 500hp with no problems...

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There are lots of reasons parts fail, The easy thing to do is blame the part After 20 or so years rebuilding and repairing diesels I have seen more parts fail from improper assembly or the wrong part used for the application than defective parts,Now I am not saying that cheep eagle cranks are good < looked like a pourous casting> from pics, but I do know a chevy builder that uses 4 inch arm cast cranks in 650 hp range with out failure and I think they are eagle made

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and we thought we would hold less than 500 HP without problems.

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Yeah, this cranks are supposed to handle 500hp with no problems...

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There are lots of reasons parts fail, The easy thing to do is blame the part After 20 or so years rebuilding and repairing diesels I have seen more parts fail from improper assembly or the wrong part used for the application than defective parts,Now I am not saying that cheep eagle cranks are good < looked like a pourous casting> from pics, but I do know a chevy builder that uses 4 inch arm cast cranks in 650 hp range with out failure and I think they are eagle made

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Do the engines spin the opposite direction down there in Argentina?


My eagle 4 inch arm is holding up at about 450 observed hp. It internally balanced with the I-beam rods, and I have an ATI balancer...sure hope it keeps on trucking! I only have about 5000 miles, and about 50 quartemile passes on it.

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Nice, it should stay together for a long time, you are producing the Horepower range the crank was intended for and probably shifting below the 6000rpm range.
My personal experience, eagle cast crank is a thing of beauty, light, affordable, easy to internally balance with no mallory, and the I beam eagle rods are the best value in the the market.
Doc

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to the original poster:

did you have any balancers breaking before this crank broke?

asking since i have observed a crazy behavior from a friends cast eagle crank and im afriad his crank is about to do what yours already did, at about the same powerlevel.

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I wonder how many of these failed cranks are due to other problems as Scat points out with their units.
First, have these units been balanced externally? Or balanced at all.
If so have they been balanced properly by a pro?
Second, assembly? Were the balancers installed correctly? Or pounded on with a hammer.
Bottom line is these engines are often assembled by backyard mechanics with backyard practices. Often leading to mechanical failures.
People suggesting they broke a crank in the burn out box is just silly. Simply that was the hair that broke the camels back. So what really lead to the crank failure? Over revving? Who knows, I am sure there are many reasons for the failures, however my experience has been if built properly, within the limits outlined by the manufacters both Scat and Eagle make good products.
Why more eagle failures? They probably out sell Scat two to one.