Re: Crank scrapers - HP increases?
[Re: Moparmal]
#180970
01/01/09 09:33 PM
01/01/09 09:33 PM
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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,204
Bend,OR USA
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I rememeber reading a article in a car mag. several years back(10 to ?) that said that on a small block Chevy that made around 600 hp at 7000 rpm the crank scraper added around 20 hp at 7000 rpm but wasn't worth any power or Tque below 5000 rpm on that dyno I wasn't there and didn't see it, like most magazine articles, so take that for what it is worth. I do make my own on all motors that will be raced at the drags now I shoot for between .030 and .045 clearances to the rods and crankshaft oo a steel rod motor in a cast iron block. Add another .030 clearnce on aluminum rods or a endurance motor or a street motor using a cast iron block.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Crank scrapers - HP increases?
[Re: dthemi]
#180976
01/02/09 03:29 PM
01/02/09 03:29 PM
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Joined: Mar 2007
Posts: 110 Concord California
Evil_Ways
member
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member
Joined: Mar 2007
Posts: 110
Concord California
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Who makes crank scrapers for small and big block Mopars.
Last edited by Evil_Ways; 01/02/09 03:32 PM.
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Re: Crank scrapers - HP increases?
[Re: Evil_Ways]
#180977
01/02/09 03:38 PM
01/02/09 03:38 PM
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Joined: Jan 2005
Posts: 656
griff70440
mopar
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mopar
Joined: Jan 2005
Posts: 656
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Re: Crank scrapers - HP increases?
[Re: jughed]
#180980
01/02/09 05:42 PM
01/02/09 05:42 PM
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Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Screens are just designed to limit and slow the back splashing of oil onto the crank.
Thats how I have understood it.
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
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Re: Crank scrapers - HP increases?
[Re: dthemi]
#180981
01/02/09 06:24 PM
01/02/09 06:24 PM
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Joined: Apr 2004
Posts: 1,981 SE Michigan
TS3303
top fuel
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top fuel
Joined: Apr 2004
Posts: 1,981
SE Michigan
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Quote:
I can't say exactly how much, but can assure you it will be worth power. The farther you can keep the crank away from the oil, and the more you can get off the crank the more power you'll make. Ideally like a dry sump there would be no oil in the pan, just a big decompression area in as much vacuum as could be produced.
Darren have you seen similar gains with a dry sump and scraper?
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Re: Crank scrapers - HP increases?
[Re: dthemi]
#180983
01/02/09 07:42 PM
01/02/09 07:42 PM
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Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Scrapers help in dry sumps just like a wet sump. The oil tries to wrap up all over the crank even in a dry sump. the more you can scrape off the better. I like big dry sump pans with scrapers and screens, and a big bulge on the side for the oil to get slung into.
Windage trays,baffeling,and simple direction oil catches will gain you 10 to 20 Hp.Elaborate closefitting scrapers,wide block(oil pan rails),wide pans,drain down control with proper crankcase ventalation will net you much more.Determining how much depends on the oil control factored by the amount of oil passing from the clearences that splash lube the rotating parts as well as the cylinder walls.Scraper minimize the splash oil and most componants can live on suspended mist lubercation.I wouldn't recommend it for long duration running,but it would be excellent for short duration race engines.
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Re: Crank scrapers - HP increases?
[Re: Locomotion]
#180986
01/03/09 07:05 PM
01/03/09 07:05 PM
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Joined: Sep 2006
Posts: 411 Portersville, Pa
1badx
mopar
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mopar
Joined: Sep 2006
Posts: 411
Portersville, Pa
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Quote:
I never felt comfortable with windage trays, especially with a deeper sump that keeps the oil level further away from the rotating assembly.
I am running my first deep sump/aluminum rod/stock stroke engine and saw this thread and have to ask what are your thoughts on running a windage tray. I have always run one with a stock pan. Should I run a windage tray with the Milodon 10qt pan and aluminum rods?
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