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Re: Early crank toughness...
[Re: Medlock51]
#2692378
08/28/19 06:35 PM
08/28/19 06:35 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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That's more than most builders will run a 5.7 crank that is not turned down to 1.88, I would never attempt that with the 5.7 crank, the casting is good but not that good. Maybe a 6.1 crank would be worth trying that on, at least they are forged.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Early crank toughness...
[Re: Medlock51]
#2692433
08/28/19 09:45 PM
08/28/19 09:45 PM
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Joined: Jul 2019
Posts: 194
Springtown Pa
Ray408G3Hemi
member
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member
Joined: Jul 2019
Posts: 194
Springtown Pa
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Looking for some input from guys who have experienced crank failure with the OEM cast crank used in the pre-Eagle engines. I have spoken with two shops who have worked on these engines (stock rebuilds) and they don't have any experience with the widely held opinion that they are prone to breakage.
I putting a plan together for a second engine for my dirt car and will use an early 5.7 block using the OEM crank turned down to for 1.888 journals to utilize the NASCAR Pankl rods I have in stock. I may use the early heads or Eagle heads... not sure. Light weight pistons. Trying to hit the 650-700 HP mark using a single 4 barrel carb and the MSD 6 ignition.
If I can get some reasonable dyno numbers I'll build something a little tougher on the next build.
Mopar was always known to have some good quality cranks/rods in the past but I'm not sure the mexican made parts are up to the task. stock rod journal crank will take it the rods won't,,a 1.88 might be pushing it with the stock cast crank.....do you plan to on center the 1.88 journal ? or are you trying to gain some stroke? the pre Eagle heads need a lot of work to get you to 600Hp @ 345-360Ci, 700Hp @ 345 Ci is 2.02 Hp/Ci you will need some serious RPMs to get that. best flow #s I've found on the interwebs for the Pre Eagles is 340CFM @ 650 and I still think that was optimistic.
1963 Thunderbolt 496FE 10.80 (still a work in progress)
1968 Mustang slow a$$ 428 FE
1971 Boss 351 Mustang 11.20@115mph
1993 Lightning 10.61 @ 129mph 408Ci A3 headed NA
1996 Viper GTS
2001 Lightning 8.99 @ 155MPH 5.4 Mod Motor
2009 Ram 9.65@144MPH 463CI G3 NA
2010 Challenger 9.91 @ 139MPH 408CI G3ci NA
2019 F150 (local dealer's Lightning package) ..11.90s
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Re: Early crank toughness...
[Re: HotRodDave]
#2692483
08/29/19 12:16 AM
08/29/19 12:16 AM
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Joined: Jan 2008
Posts: 4,254
Canada
WO23Coronet
master
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master
Joined: Jan 2008
Posts: 4,254
Canada
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That's more than most builders will run a 5.7 crank that is not turned down to 1.88, I would never attempt that with the 5.7 crank, the casting is good but not that good. Maybe a 6.1 crank would be worth trying that on, at least they are forged. There was a guy on here a couple of years back that did a roundy round Gen III using a 6.1 crank and he ran into oiling problems due to it being cross drilled and starving the rods at high (7500+) rpm? He got it solved and made a ton of power, I think he went with an aftermarket crank.
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Re: Early crank toughness...
[Re: Ray408G3Hemi]
#2696521
09/11/19 11:42 AM
09/11/19 11:42 AM
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Joined: Jan 2003
Posts: 25,743
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,743
Rio Linda, CA
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[quote=Medlock51]
stock rod journal crank will take it the rods won't
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