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that's not unusual with a cast crank. they just aren't made to hold up to that much horsepower.

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That`s what I used to think too Dan till I saw Darrell Parks click off consistent low 9`s with his cast crank iron headed small block. Granted it`s a 2500 lb. car but I`m guessing he`s making more power than the poster.

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Internal balance or external? As was asked.. what balancer and how did it go on?

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is the engine of a buddy, the damper it's a Mopar Performance.

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Dram,tell me something new.Why does a stock 360 crank hold 450 hp and not this cast crank?I have never a stock crank breaking but I could be wrong.back to the topic I had one of the cast when they first came out and my block let go before the crank did.After twisting 2 h-beams the crank was still good.i was running [Email]10.50@3400[/Email] pound car.if I was building a few motor I would do the steel crank.

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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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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 were not made in China!

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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.

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I've seen that too, in fact the guy that did machine work for me had one in a 11.00/10.90 A body with an automatic and it broke the same way.

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Just another example of people not following the recommended HP ratings for these cranks. A 3000lb A body with a 200lb drive will go 11.40 with a 500HP engine.
In other words, your machinist was making around 540-550HP to run 10.9's with the cast crank. Is it any wonder it failed? Clearly with that type of HP the motor should have had a forged crank.

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It doesn't take 500hp to run 10.90's @3200lbs. I tried to use an eagle cast crank in my daily driver truck,but in 10 minutes after it showed up I had in back in the box for return. I was not able to save my buddy as he used this crank for almost 2 seasons,running 11.00 @ 3200lbs then it came apart and destroyed a lot more than the crankshaft. Good luck.

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I will agree to disagree, in my opinion it takes all of 500+ horsepower to run 10.90's in a 3200lbs door car and the need for a forged crank is obvious in such a fast car. If the friend got two yrs. out of the deal I would say he did pretty good considering the crank is on the ragged edge of its recommeded range.

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Thats the second one i saw that broke the snout. After examining the one I had, I thought the weak point was the rear arm/journal cross section especially with all 8 cylinders twisting it.

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It doesn't take 500hp to run 10.90's @3200lbs. I tried to use an eagle cast crank in my daily driver truck,but in 10 minutes after it showed up I had in back in the box for return. I was not able to save my buddy as he used this crank for almost 2 seasons,running 11.00 @ 3200lbs then it came apart and destroyed a lot more than the crankshaft. Good luck.

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I will agree to disagree, in my opinion it takes all of 500+ horsepower to run 10.90's in a 3200lbs door car and the need for a forged crank is obvious in such a fast car. If the friend got two yrs. out of the deal I would say he did pretty good considering the crank is on the ragged edge of its recommeded range.

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I will agree to disagree. It does not take a forged crank to withstand that output. Just a factory cast crank or a cast MP/Scat crank and you'll have far better odds of a reliable engine,rather than a potential disaster. The engine in the duster was less than 500 hp(yes, it was on the dyno),so give me some idea how long that crank might last @ 450hp,475hp,etc I'd love to know the answer.I'll just keep putting better cranks in my builds and sleep better.

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It doesn't take 500hp to run 10.90's @3200lbs. I tried to use an eagle cast crank in my daily driver truck,but in 10 minutes after it showed up I had in back in the box for return. I was not able to save my buddy as he used this crank for almost 2 seasons,running 11.00 @ 3200lbs then it came apart and destroyed a lot more than the crankshaft. Good luck.

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I will agree to disagree, in my opinion it takes all of 500+ horsepower to run 10.90's in a 3200lbs door car and the need for a forged crank is obvious in such a fast car. If the friend got two yrs. out of the deal I would say he did pretty good considering the crank is on the ragged edge of its recommeded range.

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I will agree to disagree. It does not take a forged crank to withstand that output. Just a factory cast crank or a cast MP/Scat crank and you'll have far better odds of a reliable engine,rather than a potential disaster. The engine in the duster was less than 500 hp(yes, it was on the dyno),so give me some idea how long that crank might last @ 450hp,475hp,etc I'd love to know the answer.I'll just keep putting better cranks in my builds and sleep better.

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Not all dyno's are created equal, just ask Hughes. At 450HP the eagle cranks are lasting a very long time, 7+ yrs. which is a long time in the life of most street strip rides.
In fact I just got 7 yrs. out of a 360 which had two cylinders cracked. Was it the blocks falt these cyls cracked? Who knows, however it didn't help that I overheated it a yr. ago when it started leaking fluid. So which came first the crack, or the overheating which likely led to the cracks?
What did I put back in? Another 360 because they make great drag motors with or without a stroker crank..

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It doesn't take 500hp to run 10.90's @3200lbs. I tried to use an eagle cast crank in my daily driver truck,but in 10 minutes after it showed up I had in back in the box for return. I was not able to save my buddy as he used this crank for almost 2 seasons,running 11.00 @ 3200lbs then it came apart and destroyed a lot more than the crankshaft. Good luck.

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just love that duster

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Yep, I'll call Hughes in the morning so that I can be truly informed.

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I will agree with you on this, Hughes is not all they are "cracked" up to be..

Interesting to note Mancini racing sell three different brands of cranks including cast eagles.
Things that make you go hummm? If eagle cast cranks were such an issue why would one of the top Mopar houses carry this product?
When you call the Hemi hot line they have no ill feelings about anyone using cast eagle cranks and have no mass reports of eagle crank failures?
To me this whole post was likely started by a few ill informed Scat fans.
According to my local speed shop it is Scat that is having the quality control issues, not Eagle.

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Latest update, our 408 with the eagle cast crank went 11.93 @ 111.4 in our 3600lb b-body satellite today.
Boy am I happy..

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Latest update, our 408 with the eagle cast crank went 11.93 @ 111.4 in our 3600lb b-body satellite today.
Boy am I happy..

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And of course when it breaks you'll update us on that as well right?

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We can hope he does. I'll make a deal with him,I'll report back when the stock 360 cast crank breaks,it's been 100,000 street miles and makes 10 second passes without a second thought @ 3600lbs. We have hundreds of passes on this junk so you better get busy.

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Latest update, our 408 with the eagle cast crank went 11.93 @ 111.4 in our 3600lb b-body satellite today.
Boy am I happy..

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And of course when it breaks you'll update us on that as well right?

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We can hope he does. I'll make a deal with him,I'll report back when the stock 360 cast crank breaks,it's been 100,000 street miles and makes 10 second passes without a second thought @ 3600lbs. We have hundreds of passes on this junk so you better get busy.

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