Knife Edging Cranks?
06-04-2006, 12:01 AM
#21
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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.
06-04-2006, 09:12 AM
#22
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.
06-04-2006, 11:18 AM
#23
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.
06-04-2006, 11:27 AM
#24
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.
06-06-2006, 12:39 PM
#25
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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.
