Eagle 100mm Forged Crank vs 4G64 OEM Crank
#1
Evolving Member
Thread Starter
Eagle 100mm Forged Crank vs 4G64 OEM Crank
Which one has been the most successful for you High HP & Tq Builds?
Post your experiences please.. I currently have OEM crank that needs to be polished etc.. but wont bother to put it in if Eagle is stronger and will last long... refreshing the motor and current rev max is 8600
Post your experiences please.. I currently have OEM crank that needs to be polished etc.. but wont bother to put it in if Eagle is stronger and will last long... refreshing the motor and current rev max is 8600
#3
EvoM Guru
iTrader: (1)
Stock 100mm crank is cast. I would definitely choose the Eagle over it. The OEM 100mm is NOT as strong as the OEM 88mm. The OEM 88mm can definitely handle big numbers.
#4
EvoM Guru
iTrader: (9)
Any larger crank is going to have increased harmonics. This is often overlooked and leads to issues. Cracks,bearing issues, bolts coming out.
An ATI or Fluidampr is a MUST for a larger then stock crank and is also beneficial anytime you change pistons/rods. The engine assembly must be balanced but thats a given for most engine builders.
An ATI or Fluidampr is a MUST for a larger then stock crank and is also beneficial anytime you change pistons/rods. The engine assembly must be balanced but thats a given for most engine builders.
#6
Evolving Member
iTrader: (8)
Go with the Eagle hands down. Ive had and have pushed mine for years 650lb/ft 800hp+. I cracked the stock one many years ago.
I chose Eagle over all others cause at the time the guys at English racing hadnt seen one broken crank from them, and had seen broken cranks from everybody else. They since seen one broken crank from Eagle and many more from every other manufacturer.
I chose Eagle over all others cause at the time the guys at English racing hadnt seen one broken crank from them, and had seen broken cranks from everybody else. They since seen one broken crank from Eagle and many more from every other manufacturer.
#7
Account Disabled
No, that's nothing more than an assumption.
Where's the proof?
I've spent time with an Eagle crank, the dimensions (size, taper, out of round) were all out of spec and it needed regrinding before use.
Then they need re nitriding again afterwards.
That's IF it was ever nitrided in the first place........they're too soft without having it done.
As far as stock cranks go, most of them are great, some have flaws in which show up , ending up broken even in stock situations.
Last edited by RightSaid fred; Jul 22, 2017 at 12:51 AM.
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#8
Evolved Member
Make sure you have the stock unit magnafluxed, shot peened.
Last edited by 2winscroll; Jul 26, 2017 at 08:02 AM.
#9
EvoM Guru
iTrader: (1)
That's BS a 4g64 crankshaft is forged and very strong. 1000hp has been done on a stock 4g64 crank. 7 bolts are extremely strong, but you can run tighter main clearances on an aftermarket billet crank because there is less flex.
Make sure you have the stock unit magnafluxed, shot peened.
Make sure you have the stock unit magnafluxed, shot peened.
https://www.evolutionm.net/forums/ev...ml#post3933138
Last edited by letsgetthisdone; Jul 26, 2017 at 08:31 AM.
#10
Evolved Member
[QUOTE=letsgetthisdone;11759972]They are apparently forged. But they are not worth running for the small $ savings.
https://www.evolutionm.net/forums/ev...-build-38.html
Like I said shot peened, magnafluxed and balanced, you should have no problems at 800hp. 1000hp is probably pushing it.
https://www.evolutionm.net/forums/ev...-build-38.html
Like I said shot peened, magnafluxed and balanced, you should have no problems at 800hp. 1000hp is probably pushing it.
#11
EvoM Guru
iTrader: (1)
[QUOTE=2winscroll;11760039]
$250ish for a "good" used crank, which then needs to be polished, balanced, mag'ed, and shot peened (per your rec), will likely get over $500. Or just buy an eagle and have it balanced for about the same price.
They are apparently forged. But they are not worth running for the small $ savings.
https://www.evolutionm.net/forums/ev...-build-38.html
Like I said shot peened, magnafluxed and balanced, you should have no problems at 800hp. 1000hp is probably pushing it.
https://www.evolutionm.net/forums/ev...-build-38.html
Like I said shot peened, magnafluxed and balanced, you should have no problems at 800hp. 1000hp is probably pushing it.
#13
Evolved Member
[QUOTE=letsgetthisdone;11760042]
Your still going to need to polish, balance, a aftermarket crank. The finish is horrible on most. To magnaflux and shot peen is only $100.
Oh yea did I mention they forged cranks
Oh yea did I mention they forged cranks
#15
Evolved Member
Read this it might help, but probably not. I've had several done.
https://books.google.com/books?id=Y2...page&q&f=false