how much rpm can a cast eagle cast crank handle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dbmx66 · 02-03-2011, 01:35 AM

i got an eagle cast crank for free. i wanted to throw it in a street/strip engine. nothing hardcore.

i have a forged crank in the c10. i dont know much about cast cranks, are they a waste of time? the motor is gonna be n/a, no turbo nitrous or super charge with about 10.5 compression. its gonna be for my lifted k10 we just picked up. i am planning on giving it some abuse. it is gonna be in a mud truck which will prolly see some higher rpms.

what are your opinions?

Rodms · 02-03-2011, 02:26 AM

Use it you won't have any problems,my machinist uses cast cranks in the big blown motors an says they work better than forged,and he builds the big ones.

oldschool53_BBC · 02-04-2011, 06:01 PM

It will work fine

Marv D · 02-04-2011, 09:20 PM

Cast and nodular iron is more 'forgioving' than a hard forged crank. Detonation wants to crack a journal out of a hard crank,, cast will 'flex' and survive.
That said, I used to repeatedly take a cast GM 350 crank to 7500 with heavy old TRWL2304f pistons, and a 250HP shot of nitrous. Riciprocating can be hard with RPMs, so a good balance job is a necessity.

In fact. not that I think about it, 10 yeats later that motor is still running with nothing but fresh rings and bearings.

cableguy0 · 02-04-2011, 10:56 PM

I had a nasty little 355 with a gm iron crank in it. It regularly saw 7000rpm and never had an issue. Balancing is key with making any rotating assembly survive.

02-03-2011, 01:35 AM	#1
dbmx66 Registered User Join Date: Aug 2009 Location: PA Posts: 883	how much rpm can a cast eagle cast crank handle? i got an eagle cast crank for free. i wanted to throw it in a street/strip engine. nothing hardcore. i have a forged crank in the c10. i dont know much about cast cranks, are they a waste of time? the motor is gonna be n/a, no turbo nitrous or super charge with about 10.5 compression. its gonna be for my lifted k10 we just picked up. i am planning on giving it some abuse. it is gonna be in a mud truck which will prolly see some higher rpms. what are your opinions?

02-03-2011, 02:26 AM	#2
Rodms Registered User Join Date: Jul 2008 Location: Olive Branch,Mississippi Posts: 347	Re: how much rpm can a cast eagle cast crank handle? Use it you won't have any problems,my machinist uses cast cranks in the big blown motors an says they work better than forged,and he builds the big ones. __________________ Built chevy tuff!

02-04-2011, 06:01 PM	#3
oldschool53_BBC Registered User Join Date: Dec 2010 Location: Orlando FL Posts: 36	Re: how much rpm can a cast eagle cast crank handle? It will work fine __________________ 1953 BBC 3100 427 T-400 12 Bolt Al

02-04-2011, 09:20 PM	#4
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: how much rpm can a cast eagle cast crank handle? Cast and nodular iron is more 'forgioving' than a hard forged crank. Detonation wants to crack a journal out of a hard crank,, cast will 'flex' and survive. That said, I used to repeatedly take a cast GM 350 crank to 7500 with heavy old TRWL2304f pistons, and a 250HP shot of nitrous. Riciprocating can be hard with RPMs, so a good balance job is a necessity. In fact. not that I think about it, 10 yeats later that motor is still running with nothing but fresh rings and bearings. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

02-04-2011, 10:56 PM	#5
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: how much rpm can a cast eagle cast crank handle? I had a nasty little 355 with a gm iron crank in it. It regularly saw 7000rpm and never had an issue. Balancing is key with making any rotating assembly survive. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.



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