Realoldspower.com

RR · Joined: 16 Jan 2007 Posts: 209 Location: Clanton, AL

I am interested in building a 5-600 HP Olds big block. I am interested in crankshaft selection- what crankshaft should I use? Eagle now has a stock throw 455 cast steel crank and CAT now sells a crank (forged??). Does anyone have any experience with these? This motor will probably be normally in the range of 450 HP with a shot of nitrous, if that matters.

Beefing up the bottom end is already on the list, now I need some good advice about the crankshaft- anyone already running either of these cranks?

Thanks in advance.
_________________
Rusty
1965 Chevy truck
461 cid Olds, TRWs, Comp cam,
Rocket Racing Heads
too much money invested and not enough
intelligence to stop spending on it....
http://www.cardomain.com/ride/2650479

BTR Bill · Joined: 10 Mar 2005 Posts: 1760 Location: Rochester,NY

Stick with the factory cast. Not quite sure of the quality of the other stuff yet.
_________________
Bill Trovato

BTR Performance.com/Highperformanceolds.com
Cheap parts will in fact work for a little while.

mcalvo · Posted: Wed Sep 10, 2008 1:02 pm Post subject:

You can easily build a 500hp bb with a factory nodular crank. Check out the engine build section.

Rule of thumb; run the lightest piston and rods that you can afford.

-Michael
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Check out the custom Olds parts available for sale at:
http://home.comcast.net/~mcalvo1/frankt.htm

SCREAMING 65 · Joined: 18 Mar 2005 Posts: 509

If you currently do not have a crankshaft, I would run the Eagle. JMO CAT lists a forged, but it is not done. Chances are they won't. They put it out there to see if there is enough interest.
_________________

race weight 3680
normally aspirated
RR cylinder heads/intake
4:10 gear
30x9 tire 1.29 60 ft
turbo 400
9:40's @ over 141 mph with more to go
www.rocketracingperformance.com

chin0 · Posted: Wed Sep 10, 2008 4:27 pm Post subject:

http://www.realoldspower.com/phpBB2/viewtopic.php?t=50111

I couldn't find any info on the eagle crank. I was wondering how much can this Cast Steel Crank take? I am also doing something similar to RR, what sort of reinforcement should I do to the short block? Girdles? Motor Plate? Billet Main? Do I need anything of that sort. Sorry for the thread jack, but this motor would be a 10.5:1 Compression pump gas motor. For a street car.
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RR · Joined: 16 Jan 2007 Posts: 209 Location: Clanton, AL

I don't currently have a crank. As for beefing up the bottom, I am considering a girdle of my own design- but that is something that I haven't designed yet.
_________________
Rusty
1965 Chevy truck
461 cid Olds, TRWs, Comp cam,
Rocket Racing Heads
too much money invested and not enough
intelligence to stop spending on it....
http://www.cardomain.com/ride/2650479

Schurkey · Posted: Thu Sep 11, 2008 10:13 pm Post subject:

Don't make the mistake of thinking that these Chinese "Cast Steel" cranks are made from anything better than cast iron.

It's not like they're pouring molten steel into a mold. You can be assured that there's way too much carbon in the metal to be considered "steel".

SCREAMING 65 · Joined: 18 Mar 2005 Posts: 509

507olds · Joined: 10 Mar 2005 Posts: 5006 Location: Erie,Pennsylvania

Is it harder,but possibly more brittle?
_________________
Brian Trick
thetrickfamily@yahoo.com
814-440-3553
70 W30's
72 Supreme 507

SCREAMING 65 · Joined: 18 Mar 2005 Posts: 509

no, better material. It is the same material they use in the big chevy cranks.
_________________

race weight 3680
normally aspirated
RR cylinder heads/intake
4:10 gear
30x9 tire 1.29 60 ft
turbo 400
9:40's @ over 141 mph with more to go
www.rocketracingperformance.com

mcdn81olds · Joined: 30 Mar 2005 Posts: 104 Location: Missouri

chin0 · Posted: Fri Sep 12, 2008 4:15 am Post subject:

I'm chinese, I'm into muscle cars and I am making a BBO stroker with a chinessium cast steel crank. I'm hopeless
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midgetorama · Joined: 09 Mar 2005 Posts: 1068 Location: Montana

RR · Joined: 16 Jan 2007 Posts: 209 Location: Clanton, AL

Has anyone contacted Eagle regarding the quality control of their castings? I know the casting is chinese, but I thought that they machined them here. Not that that will improve the strength, but you would think that they also test the castings for strength. If for no other reason, you would think they would be concerned about legal concerns. A simple, though destructive metalurgical test would determine the makup of the steel.
_________________
Rusty
1965 Chevy truck
461 cid Olds, TRWs, Comp cam,
Rocket Racing Heads
too much money invested and not enough
intelligence to stop spending on it....
http://www.cardomain.com/ride/2650479

swolds · Joined: 08 Mar 2005 Posts: 1352 Location: TORONTO

Welding up journals are a pain in the ass.
Great material they use in these Laughing

Not a bad crank for the price though