Knife Edging Cranks?
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
About to make this decision myself. I will get a quote from the machine shop and if it is in the $200 to $250 range I will probably have it done. Every horsepower counts when you are trying for 400RWHP with a 355 gen one L98 small block. 
Crank work is not the most fun you will ever have that's for sure. I agree with Eric, bull nose on the front and knife edged on the back along with what Curtis said turn down the counterweights and throw some Mallory into it.
Bret
Bret
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Originally Posted by TAF Motorsports
Thanks guys, I'm looking at getting a 4" eagle crank and just have it knife edged.
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Originally Posted by 1fastWS6
I think you'll find that its cheaper to buy a crank already done the way you want it from Eagle, Callies or whoever, than to pay someone to modify one you already have and then re-balance it. Most shops around here charge $200+ just for the balance job alone.
. Thanks again for the feedback guys
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
I guess the million doller question is when does it become worth it to knife edge the crankshaft and what horsepower gains are seen? If you have a motor that does not turn above 6200rpm is it worth it? If you have a deep sump oil pan to keep the oil away from the crank and a good windage tray is it worth it? If I knew I would see a 5hp gain or more than I would say it is worth it. If one or 2 horsepower than no.
TECH Fanatic
Joined: Jun 2002
Posts: 1,979
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From: Upstate NY
Originally Posted by TAF Motorsports
Dry sump
"...how fast do you want to go?"
Last edited by Old SStroker; May 24, 2006 at 09:42 AM.
Originally Posted by Old SStroker
"...how fast do you want to go?"
Interesting concept on compartmentalizing.
Originally Posted by 1989GTA
I guess the million doller question is when does it become worth it to knife edge the crankshaft and what horsepower gains are seen? If you have a motor that does not turn above 6200rpm is it worth it? If you have a deep sump oil pan to keep the oil away from the crank and a good windage tray is it worth it? If I knew I would see a 5hp gain or more than I would say it is worth it. If one or 2 horsepower than no.
Bret
Originally Posted by 1989GTA
I guess the million doller question is when does it become worth it to knife edge the crankshaft and what horsepower gains are seen? If you have a motor that does not turn above 6200rpm is it worth it? If you have a deep sump oil pan to keep the oil away from the crank and a good windage tray is it worth it? If I knew I would see a 5hp gain or more than I would say it is worth it. If one or 2 horsepower than no.
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Just got a quote from Lopez Crank to do the "airplane" style knife edge on my crank for $200. I would think is the same a bullnose leading edge and knife edge on the trailing side. This will be on a 355 only turning maybe 6200rpm.
For that price I might just give it a go. Joe Racer was the increase mainly in the upper rpm range or across the board? Thanks
For that price I might just give it a go. Joe Racer was the increase mainly in the upper rpm range or across the board? Thanks
Last edited by 1989GTA; May 25, 2006 at 10:16 PM.
Originally Posted by 1989GTA
Joe Racer was the increase mainly in the upper rpm range or across the board? Thanks