Subject	The crackcase in wet sup system is not a vacuum. The
Posted by	AZHeat on December 03, 2007 at 3:44 PM
	This message has been viewed 89 times.
In Reply To	We all learn something new everyday. I was thinking about posted by Gordo 93TT Daytona on December 03, 2007 at 02:46 PM
Message	crank is spinning whipping up air and also oil droplets from the rod bearings. The crankcase also has some pressure from the downward force of the backside of the piston and the blow by gases. If you don't control the pressure or the oil slinging, it will cost hp at higher rpm. I saw an article on F1 Nissan Infinity engine where they put the crankcase under vacuum, the engine gained about 50HP at 10,000 + rpm. On some dragsters, they install vacuum pumps as part of the accesorry to pump the air out of the crackcase. "Yes, I know more then JWT. Someone has to be the top dog, and it just so happens it's me." Nixit
Follow Ups	What is wrong with our bearings?? made inside.... - bubuche 02:36:09 12/03/07 How many miles did you get after the build? - Devi13 04:00:23 12/03/07 you live in France. (n/m) - Eishozzzz 04:11:02 12/03/07 Sorry to hear it. - Bezza 05:14:27 12/03/07 If you were detonating then you might have - RSR 07:14:10 12/03/07 What type of fuel were you using? (n/m) - RAGTPZ 07:27:30 12/03/07 Wrong size bearing. Most likely the case. (n/m) - luke21 07:29:18 12/03/07 Should have tuned the car & turned the boost down. (n/m) - Bernie (NoVA) 07:30:03 12/03/07 >>> - ztunerz 07:43:23 12/03/07 I built up the engine myself. - bubuche 08:12:03 12/03/07 If you tune your car by ear and wait to *hear the detonation - whitepearlz 08:35:04 12/03/07 on high hp Z's especially on in road racing - ztunerz 08:54:27 12/03/07 road and track racing too ;) - bubuche 10:22:44 12/03/07 I have a similar setup as your you... - VECTOR 10:24:21 12/03/07 Road racing with high G turns , braking, acceleration - AZHeat 10:58:30 12/03/07 That's what I was thinking. Oil starvation due to high G's - Gordo 93TT Daytona 11:20:28 12/03/07 The crank counterweight should never slosh in - AZHeat 12:22:56 12/03/07 Maybe I was thinking about my Dad's Model A?? (n/m) - Gordo 93TT Daytona 13:52:08 12/03/07 I have seen old old engines have a oil scoop on the - AZHeat 13:56:56 12/03/07 yep...about 50+ years ago (n/m) - aliaZ 13:58:48 12/03/07 We all learn something new everyday. I was thinking about - Gordo 93TT Daytona 14:46:50 12/03/07 The crackcase in wet sup system is not a vacuum. The - AZHeat 15:44:52 12/03/07 Have you progressed further on your prototype pan? (n/m) - Gordo 93TT Daytona 16:51:55 12/03/07 Yes. Doing the final install on my car in a few weeks. - AZHeat 17:28:17 12/03/07 Good Luck. I know you've put alot of time and energy into - Gordo 93TT Daytona 07:57:04 12/04/07 Well, actually, some modern lawnmower-type engines - RSR 18:10:22 12/03/07 I've overhauled a couple - BlackholeZ 18:49:50 12/03/07 no...the crank and rod bearings must be pressure fed (n/m) - aliaZ 13:49:24 12/03/07 Yeah, I am waiting to see your new oil pan - moxie (SF) 17:34:36 12/03/07 are you running race gas? (n/m) - aliaZ 13:47:25 12/03/07 No, i'm running standard high quality gas... - bubuche 02:22:46 12/04/07 you just found your problem - aliaZ 09:03:59 12/04/07
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