Posted By: flatiron
Eagle cast stroker crank---Quality - 01/07/10 05:13 AM
Anyone familar with The eagle cast crank that Mancini has on sale part number#eag103604000 Opinions good or bad
Eagle cast stroker crank---Quality
Posted By: dodgeboy11
Re: Eagle cast stroker crank---Quality - 01/07/10 06:15 AM
Quote:
Anyone familar with The eagle cast crank that Mancini has on sale part number#eag103604000 Opinions good or bad
Yep, unfortunately I am familiar with them.
Get the Scat if you must go cast, or possibly the Ohio crank. The balance hole through the rod throw is just too large, severely weakens the crankshaft.
Posted By: moper
Re: Eagle cast stroker crank---Quality - 01/07/10 12:14 PM
I've used several. One on the bench now. No issues in the applications I used them in. (street cars, hp between 430-480)
Posted By: StandOnIt
Re: Eagle cast stroker crank---Quality - 01/07/10 12:48 PM
Who makes the MP cast crank? I bought one from a friend of mine that had been completely reworked by Hotard. Lots of mallory and cleaning up. I'm only at about 430 or so hp and only spinning it up to around 5800 rpm so no problems with it at all. Foot brake car, 4" stroke sb.
Posted By: patrick
Re: Eagle cast stroker crank---Quality - 01/07/10 01:16 PM
Quote:
Who makes the MP cast crank? I bought one from a friend of mine that had been completely reworked by Hotard. Lots of mallory and cleaning up. I'm only at about 430 or so hp and only spinning it up to around 5800 rpm so no problems with it at all. Foot brake car, 4" stroke sb.
last I heard, SCAT
Posted By: moparacer
Re: Eagle cast stroker crank---Quality - 01/07/10 01:28 PM
Quote:
ep, unfortunately I am familiar with them.
A few years ago I built an Eagle cast crank 4 inch stroke engine that made it about 100 passes before the crank broke. I was lucky enough to catch it on the line and it didnt hurt anything else. Mine broke at the back of the crank between the rear main and #7-8 rod journal.
Replaced it with a 4340 crank and have not had any problems since.
Posted By: RyanJ
Re: Eagle cast stroker crank---Quality - 01/07/10 01:38 PM
Have sold two, both broke, one in 10.80 car, one in 11.50 car. Will never touch another one again.
Posted By: goldmember
Re: Eagle cast stroker crank---Quality - 01/07/10 03:21 PM
I purchased an Eagle cast 4" crank,just for a mild street truck. I had it out of the box for 10 minutes admiring the workmanship,then quickly packed it up and returned it. 
I sold a MP cast 4" crank to a friend about 8 years ago and it broke a month ago. It has seen an average of 350 passes a year for 8 years,only runs mid 10's and rarely over 6500rpms,we didn't expect to run it more than a year or 2. 
I sold a MP cast 4" crank to a friend about 8 years ago and it broke a month ago. It has seen an average of 350 passes a year for 8 years,only runs mid 10's and rarely over 6500rpms,we didn't expect to run it more than a year or 2.
Posted By: B G Racing
Re: Eagle cast stroker crank---Quality - 01/07/10 03:22 PM
Broke one also,never again 
Posted By: CHAPPER
Re: Eagle cast stroker crank---Quality - 01/07/10 03:55 PM
I have used 2 MP cast cranks w/4"stroke. The forged were not available yet when I got these. I built 2 408"/360 for dirt track applications..Ross pistons, Eagle rods, solid flat tappet cams, W2 heads/intake. Made 500+ HP and 500+ ft/torque on dyno. They both were run in 3200# cars. Both were run 2 seasons before problems. The first one showed signs of cracking after mag-flux and was replaced with a forged MP crank. The second one showed NO signs of cracking, so was returned to service,,#5/6 crankpin pulled out the 3rd race of season. The MP forged crank had to be turned under on the mains before I could use it. It was .001" to big and .001" out of round. I don't use alot of MP anymore.
Posted By: Fury Fan
Re: Eagle cast stroker crank---Quality - 01/07/10 04:25 PM
In other threads I've read lots of opinions on breakage of Eagle cranks ==> junk. A common thread of these opinions involves racecar usage in the sub 11.00 range.
Eagle rates the crank at 500 hp, so maybe some people push them beyond the published spec, break them, then say they are junk?
I think the suitability of this crank depends on what you want to use it for.
Eagle rates the crank at 500 hp, so maybe some people push them beyond the published spec, break them, then say they are junk?
I think the suitability of this crank depends on what you want to use it for.
Posted By: POS Dakota
Re: Eagle cast stroker crank---Quality - 01/07/10 06:38 PM
Quote:
In other threads I've read lots of opinions on breakage of Eagle cranks ==> junk. A common thread of these opinions involves racecar usage in the sub 11.00 range.
Eagle rates the crank at 500 hp, so maybe some people push them beyond the published spec, break them, then say they are junk?
I think the suitability of this crank depends on what you want to use it for.
I agree. They rate them at 500 hp and they seem to fail not too far past that, although some live through a lot more. It's not like there's any false advertisement.
I guess for the average dude with an off the shelf pre-built 450hp 408, they are fine, but I wouldnt even consider it any further than that.
I'm tired of hearing "well dont say I didnt warn you". The sting of hearing that is worse than the klunking noise in the bottom end.
Posted By: CJK440
Re: Eagle cast stroker crank---Quality - 01/07/10 06:53 PM
I had one in a 408 in my Stock Appearing Duster. It ran 11.90's with no problems.
I did notice how little material was in the the arm between 7/8 and rear journal.
One thing that is nice about the eagle cast though, is it can be internally balanced with no mallory. Thats probably because of the limited material.
I did notice how little material was in the the arm between 7/8 and rear journal.
One thing that is nice about the eagle cast though, is it can be internally balanced with no mallory. Thats probably because of the limited material.
Posted By: mickm
Re: Eagle cast stroker crank---Quality - 01/07/10 07:23 PM
Quote:
In other threads I've read lots of opinions on breakage of Eagle cranks ==> junk. A common thread of these opinions involves racecar usage in the sub 11.00 range.
but we are talking about the cast cranks, not eagle forged, correct?
Posted By: Michael
Re: Eagle cast stroker crank---Quality - 01/08/10 03:16 AM
My buddy with the Red Dakota broke his doing a very mild burnout.They are JUNK!!!! 
Posted By: Rapid340
Re: Eagle cast stroker crank---Quality - 01/08/10 03:27 AM
I looked at an Eagle cast crank, it looked like someone used a die grinder on it to lighten the crankpin sides. That scared me away form buying it.
I used a SCAT/MP cast 4 in. crank, shifting at 7K, had no problems.
I used a SCAT/MP cast 4 in. crank, shifting at 7K, had no problems.
Posted By: dodgeboy11
Re: Eagle cast stroker crank---Quality - 01/08/10 06:09 AM
Quote:
In other threads I've read lots of opinions on breakage of Eagle cranks ==> junk. A common thread of these opinions involves racecar usage in the sub 11.00 range.
Eagle rates the crank at 500 hp, so maybe some people push them beyond the published spec, break them, then say they are junk?
I think the suitability of this crank depends on what you want to use it for.
This was my combo.
4.030 flat top wiseco pistons hung on Eagle SIR rods. Eagle cast 4" crankshaft. Edelbrock LA heads with (junk) cat rocker arms. Cam was a hydraulic flat tappet, 231/237 @ .050" 110 LS installed 108 ICL. .560" at the valve. Torker II intake. Heads were ported but didn't flow past 275 cfm.
I highly doubt my combo was making 500 hp, though I could be wrong. I don't think that cam would support it. This crank lasted 6000 street miles. Granted I did beat on it but it never went over 6200 rpm.
It did warn me, I heard a knocking noise going home from work, but it was a sound I'd never heard before and the oil pressure was fine. No vibration, nothing. Then I rolled into the throttle going through an intersection and lit the tires up. Then there was vibration. Idled it home at 900 rpm. Wish I had stopped it and got myself towed home.
The other issues I had with this doorstop: One rod journal was a couple tenths under the low number, at least one side of it was. Thankfully(??:o??) the clearances still checked out and everything was within spec as far as taper and out of round, albeit, further out than I would have liked. Counterweights hit the pistons and the pilot bushing hole was an oddball size and I had to build a bushing.
I wouldn't touch another one with a ten foot pole. They (Eagle) sent me another one and I gave it to my boss at the time to use in a stocker.
Posted By: 493_DART
Re: Eagle cast stroker crank---Quality - 01/08/10 08:21 AM
Thats enough failures for me . No Eagle stuff then.
Funny......on this site......
some people on here want to bash 440Source---yet i dont see ANY info on massive failures with their cranks..........in fact, ive never heard of one yet.
Funny......on this site......
some people on here want to bash 440Source---yet i dont see ANY info on massive failures with their cranks..........in fact, ive never heard of one yet.
Posted By: moper
Re: Eagle cast stroker crank---Quality - 01/08/10 12:31 PM
Quote:
I think the suitability of this crank depends on what you want to use it for.
Definately. Yo ucan't get the lowest cost part and expect it to perform miracles. I use them in budget builds with street rpm restrictions. I carefully prep my blocks and parts so there are not odd harmonics or stresses. And they have live fine. I'd have no worries using another one for the right application. This is not the "600hp cast crank". There are others that can and exceed that level. But this ain't one...lol.
I'd also leave 440Source to those posts. Not worth the dilution here.
Posted By: RyanJ
Re: Eagle cast stroker crank---Quality - 01/08/10 02:02 PM
Quote:
Thats enough failures for me . No Eagle stuff then.
Funny......on this site......
some people on here want to bash 440Source---yet i dont see ANY info on massive failures with their cranks..........in fact, ive never heard of one yet.
Yes is'nt that funny how no one seems to have ever seen a Source crank actually fail? All the complaining comes from machining issues, which I'm sure they do have some of, & then home hobbiest engine builders who think having to scrape a main bearing to clear an 1/8" radius is some kind of challenge from Satan or something....
These Eagle CAST cranks seem to fail with regularity.... I know I would never sell another, no matter what the "intended" use was. Just because guy claims he only wants to make 425-450 HP today, never know what he will do with it in future. Just not worth the hassle/risk of running a known weak part. The 2 motors I saw them fail in were not making tremendous power, both would be under 500 HP on dyno I use, based on vehicle weights & track ET/MPH's, so you can take that under 500 HP rule & throw it away IMO.
Eagle & K1 4340 Forged 4" also have plenty of material in the CW's to not require mallory when internal balancing (unlike Callies/SCAT's) so the balance cost savings does'nt hold weight either, no pun intended. Just my
Posted By: B G Racing
Re: Eagle cast stroker crank---Quality - 01/08/10 04:13 PM
Quote:Quote:
Thats enough failures for me . No Eagle stuff then.
Funny......on this site......
some people on here want to bash 440Source---yet i dont see ANY info on massive failures with their cranks..........in fact, ive never heard of one yet.
Yes is'nt that funny how no one seems to have ever seen a Source crank actually fail? All the complaining comes from machining issues, which I'm sure they do have some of, & then home hobbiest engine builders who think having to scrape a main bearing to clear an 1/8" radius is some kind of challenge from Satan or something....
These Eagle CAST cranks seem to fail with regularity.... I know I would never sell another, no matter what the "intended" use was. Just because guy claims he only wants to make 425-450 HP today, never know what he will do with it in future. Just not worth the hassle/risk of running a known weak part. The 2 motors I saw them fail in were not making tremendous power, both would be under 500 HP on dyno I use, based on vehicle weights & track ET/MPH's, so you can take that under 500 HP rule & throw it away IMO.
Eagle & K1 4340 Forged 4" also have plenty of material in the CW's to not require mallory when internal balancing (unlike Callies/SCAT's) so the balance cost savings does'nt hold weight either, no pun intended. Just my
We had the Eagle cast crank in a 416" small block,not only did it cost a ton to internally balance but broke on the first outing on the 4th pass,68 street Cuda,4.10 street M/Ts,10.70 runs.Sleepyhead told me told me not to use it.
Posted By: moper
Re: Eagle cast stroker crank---Quality - 01/08/10 05:11 PM
I understand having to cover as many bases as you can Ryan. But taking that logic to the furthest degree one could argue that any build using a stock block needs to be built to withstand 600hp because sometime in the next few seasons the owner may want to do it. There's proper parts spec'ing and there's incorrect choices. I dont feel for mild builds (and I believe 1 -1.1hp/inch is mild for these engines) that these cranks are bad. Cheap? Yes. Taper and finish issues like all the other "economy" cranks? Yes. But that's why they go for under $300. My mortage payment doesnt depen on income from engines and yet I stand behind mine and I've paid out four figures for customers' engines when something I overlooked or screwed up led to issues. So while I can relate to the reasoning, I don't agree with blacklisting the product totally. I just use it for what it's designed for. I think the ads for this crank say up to 450hp anyway.
Posted By: @#$%&*!
Re: Eagle cast stroker crank---Quality - 01/08/10 07:28 PM
Wrong reaction, this thread is only about the cast-iron crankshafts. That said, it sounds to me like they might be weaker than the factory cast-iron cranks...
Quote:
Thats enough failures for me . No Eagle stuff then.
Posted By: CHAPPER
Re: Eagle cast stroker crank---Quality - 01/08/10 07:37 PM
The Eagle 'forged' cranks I have used in Chebbys have worked fine over the years. I believe the problem with any of the after market cranks is the "cast" part. The quality of the material/alloy/carbon content/etc is another factor. I have used alot of Eagle products in X brand engines. I am a Mopar fan myself, but make a living off the X brand racers. I don't use cast cranks in anything unless the customer already has the stuff and will not listen to my experiences...then his warranty is GONE!
Posted By: RyanJ
Re: Eagle cast stroker crank---Quality - 01/08/10 10:41 PM
Quote:
That said, it sounds to me like they might be weaker than the factory cast-iron cranks...
That would be my opinion from what I've seen... I would trust a factory 360 cast crank over an Eagle 4" Cast to be honest.... I think the factory crank will take more power. Again... just my
No one ever said I was right..... just opinionated LOL.
Posted By: cheapstreetdustr
Re: Eagle cast stroker crank---Quality - 01/08/10 11:31 PM
Quote:Quote:
That said, it sounds to me like they might be weaker than the factory cast-iron cranks...
That would be my opinion from what I've seen... I would trust a factory 360 cast crank over an Eagle 4" Cast to be honest.... I think the factory crank will take more power. Again... just my
i think the heat cycles in a used factory cast crank may be of an advantage..
cheapst
Posted By: CHAPPER
Re: Eagle cast stroker crank---Quality - 01/08/10 11:35 PM
I believe the 4" has more to do with it..
Posted By: Scamp408
Re: Eagle cast stroker crank---Quality - 01/08/10 11:51 PM
Who makes the mopar cast cranks?
Posted By: RyanJ
Re: Eagle cast stroker crank---Quality - 01/09/10 12:20 AM
Quote:
Who makes the mopar cast cranks?
It's a SCAT 9000 series crank W/ SCAT logo ground off
Posted By: moper
Re: Eagle cast stroker crank---Quality - 01/09/10 12:29 AM
I think it's more a combination of quality of casting process, consistancy of the metalurgy from modern offshore foundries, and questionable condition of the equipment used. Edelbrock has some issues with maintaining top of the line equipment so it begs the question of what is machining these parts?
Posted By: '72CudaRacer
Re: Eagle cast stroker crank---Quality - 01/09/10 01:15 AM
Quote:
Anyone familar with The eagle cast crank that Mancini has on sale part number#eag103604000 Opinions good or bad
Probably OK for their intended use, but certianly not a HP part. A fellow racer from down the street races a '65 Ford Mustang (nice) with a 460. He built a new engine w/ Eagle cast crank (?
to save a couple $) and 32 passes later it looks like the pictures posted above. Only worse. Got the block,rods, oil pan ect. 
Posted By: dodgeboy11
Re: Eagle cast stroker crank---Quality - 01/09/10 11:11 PM
I've had issues with the eagle cranks (forged) counterweights not clearing pistons in chrysler and one ford application. I prefer the Scat stuff as everything seems to clear out of the box. Haven't had any balance issues with anything that has a reasonable bobweight.
That one eagle crank taught me a lesson: buy quality pieces that are probably overkill for your application. You can nickel and dime yourself to death, but if you've got it apart, get the money to do it right. Doesn't always mean the most expensive parts, just get the right parts.
That one eagle crank taught me a lesson: buy quality pieces that are probably overkill for your application. You can nickel and dime yourself to death, but if you've got it apart, get the money to do it right. Doesn't always mean the most expensive parts, just get the right parts.
Posted By: onebadstepside
Re: Eagle cast stroker crank---Quality - 01/09/10 11:42 PM
Are the eagle forged cranks any good?...or should you avoid them?
Posted By: 440Jim
Re: Eagle cast stroker crank---Quality - 01/09/10 11:49 PM
Quote:I have never been a fan of Eagle products. They are a low cost, low quality product. I would not call them junk, just not a good value for the money. The machining on the journals is of low quality and could be acceptable or need a regrind. And doing that work adds cost to make it a bad value. Buy another brand, IMO.
Thats enough failures for me . No Eagle stuff then.
And a cast crank in a race motor, not a good idea.
Posted By: Rapid340
Re: Eagle cast stroker crank---Quality - 01/09/10 11:52 PM
I have not heard of any problems with the forged Eagle cranks.
Posted By: 440Jim
Re: Eagle cast stroker crank---Quality - 01/09/10 11:56 PM
Quote:There have been tons of Eagle forged cranks that needed to be reground to be right.
I have not heard of any problems with the forged Eagle cranks.
Posted By: Burnincircles
Re: Eagle cast stroker crank---Quality - 01/10/10 04:43 AM
I removed my eagle 4340 forged in 2 pieces after one season in a B-Mod dirt car. 358 stroke, flat top pistons with 587 heads, 2BBL. Prolly 400-425HP. Eagle did offer to sell me another at a discount. Thanks, but no thanks.
![Attached picture 5724563-MOTOR%20023[1].JPG](https://board.moparts.org/ubbthreads/upload2/5724563-MOTOR%20023[1].JPG "5724563-MOTOR%20023[1].JPG")
Posted By: goldmember
Re: Eagle cast stroker crank---Quality - 01/10/10 04:48 AM
Quote:Quote:
That said, it sounds to me like they might be weaker than the factory cast-iron cranks...
That would be my opinion from what I've seen... I would trust a factory 360 cast crank over an Eagle 4" Cast to be honest.... I think the factory crank will take more power. Again... just my
Right on!
Posted By: emarine01
Re: Eagle cast stroker crank---Quality - 01/10/10 12:49 PM
Mopar increased the mains on the 360 for a reason, cast iron cranks need more journal overlap 
Posted By: Fury Fan
Re: Eagle cast stroker crank---Quality - 01/10/10 04:51 PM
And increasing the stroke decreases the overlap unless the journals get bigger. Bigger journals lead to greater velocity at the journal/bearing interface, so oil film is more critical at high RPM. Catch 22...
Posted By: HotRodDave
Re: Eagle cast stroker crank---Quality - 01/10/10 05:24 PM
A friend of mine built a 360 magnum for his truck useing a 4 inch eagle cast crank and he used the KB dish pistons and eagle rods, he used the stock cam heads intake every thing, he just wanted some more TQ for towing. After a week it looked like the crank at the top of this thread. Couldn't have been makeing 400 HP. Also note the rods useing bolts and nuts instead of a capscrew like the SCAT, he bought new SCAT rods and crank and has been fine for a couple years now.
Posted By: dr.mopar
Re: Eagle cast stroker crank---Quality - 09/05/11 01:47 AM
Nonsense! For an eagle crank to fail we need a cause, was it balanced? Was it balanced right? There is always more to the story than some would have you believe.
Eagle rods? simply the best deal in town.
Eagle rods? simply the best deal in town.
Posted By: HotRodDave
Re: Eagle cast stroker crank---Quality - 09/05/11 05:28 AM
Dude... Are you an Eagle sales person? Every single post you have ever made on this forum is defending eagles crap, mabey in chevy land it is upgrades but not here. Every one else knows the cast cranks that they make and the SIR rods are total garbage and nothing else, they are worse than stock parts. You can look at the casting quality of those rods and see terrible grain flow issues, especially the SIR rods. The cast cranks have so much meat ground out of them on the overlap area on the front of the crank there is no way you can expect them to live under ANY power even a stockish power leval. There are plenty of guys running factory 40 year old cast 360 cranks over 500 hp with no crank issues. The SCAT crank on the other hand is way better than stock useing better cast iron than stock (eagle uses weaker material than stock)and plenty of meat on the over lap area. If it is just balance issues how come it effects a severly high number of eagle cranks VS any other crank includeing bone stock cranks?
Posted By: Moparmal
Re: Eagle cast stroker crank---Quality - 09/05/11 09:45 AM
Quote:
Dude... Are you an Eagle sales person? Every single post you have ever made on this forum is defending eagles crap,
Maybe because like me, he's never had a problem with them?
I do agree that the metallurgy is not the best from what I've seen..and mine did have to be index ground as well.
That said,....430 HP - 10000 miles a year...Internal balanced Cast Eagle..KB Forged slugs.....no issues.
Go figure.....