Knife Edging Cranks?
just go with a complete dry sump kit from Katech. They use a Razor 2 stage suction pump, an ARE pan and the standard LS6 oil pump. You will need to use a 12 quart Petersen tank, but this will get you the horsepower and reliability you will want from your setup. I think the kit is around $3000 or so. Give Jason a call, he can set you up.
The August issue of Circle Track magazine has an article by David Vizard on crank profile and coatings. The first test compares 3 3/4" stroke square face and aero counterweight Scat cranks in a wet sump motor. The aero counterweights were good for 3.5 hp at 5,500 rpm, up to 9.9 hp at 7,250 rpm. This motor had a peak hp of 470 at 6,250 rpm.
The next test is a teflon based coating on a dry sump motor crankshaft, with a 3 3/4" stroke.The coating was worth 8 hp at 7,500 rpm, but gains were not seen until about 5,000 rpm. This motor had a peak hp of 570 at 7,250 rpm.
The next test is a teflon based coating on a dry sump motor crankshaft, with a 3 3/4" stroke.The coating was worth 8 hp at 7,500 rpm, but gains were not seen until about 5,000 rpm. This motor had a peak hp of 570 at 7,250 rpm.
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Wasn't going to knife edge the crank but I'm glad I did after reading this. Decided to go with the aero style and the cost is $200. Any ways doing the math and assuming the horsepower gain is linear I came up with this.
After rounding off I came up with a 1 horsepower gain for every 275 rpm above 5500 rpm. So at 6050 rpm that would equal 5.5 horsepower. At 6325 rpm that would equal 6.5 horsepower.
After rounding off I came up with a 1 horsepower gain for every 275 rpm above 5500 rpm. So at 6050 rpm that would equal 5.5 horsepower. At 6325 rpm that would equal 6.5 horsepower.
Originally Posted by 1989GTA
Wasn't going to knife edge the crank but I'm glad I did after reading this. Decided to go with the aero style and the cost is $200. Any ways doing the math and assuming the horsepower gain is linear I came up with this.
After rounding off I came up with a 1 horsepower gain for every 275 rpm above 5500 rpm. So at 6050 rpm that would equal 5.5 horsepower. At 6325 rpm that would equal 6.5 horsepower.
After rounding off I came up with a 1 horsepower gain for every 275 rpm above 5500 rpm. So at 6050 rpm that would equal 5.5 horsepower. At 6325 rpm that would equal 6.5 horsepower.
I read about a test that gained 10hp from the knife edge and another 10hp from a coating. I think it ws a 4.0" crank in a 383. I would imagine the bigger the stroke the more power you free up from these. Then throw on a vacuum pump and see even more.
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