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Re: Crank case evac [Re: Rodney] #609096 02/10/10 12:18 AM 02/10/10 12:18 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: didn't the moroso also have slice cuts out of the pipe some where on the pipe that fit inside? I dont recall that EDIT Yes there is www.summitracing.com/parts/MOR-25900/?rtype=10 Last edited by MR_P_BODY; 02/10/10 12:21 AM.

Re: Crank case evac [Re: Crizila] #609097 02/10/10 12:41 AM 02/10/10 12:41 AM
Joined: Oct 2004 Posts: 8,165 Left Coast B BobR master
BobR master B Joined: Oct 2004 Posts: 8,165 Left Coast	Quote: If I can ever get out from under the friggin snow, I wil continue with my evac testing. This is not correct.

Re: Crank case evac [Re: Crizila] #609098 02/10/10 12:46 AM 02/10/10 12:46 AM
Joined: Oct 2004 Posts: 8,165 Left Coast B BobR master
BobR master B Joined: Oct 2004 Posts: 8,165 Left Coast	Quote: Quote: How much does the evac help? I mean say on a 11.90 car? I've heard all kinds of claims on this board from nothing to over 30HP and I'm sure there are a million variables as to why. My car only runs low 11.70's, so I'm not expecting much, but I don't see any negatives. If I could get get a tenth or so out of it ( for the $ I have in it )I'd be a happy camper. Worth absolutely nothing on 3 different dyno tests that I have personally witnessed. Worth absolutely nothing on my stocker. May help keep some seals dry.

Re: Crank case evac [Re: Rodney] #609099 02/10/10 09:17 AM 02/10/10 09:17 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: didn't the moroso also have slice cuts out of the pipe some where on the pipe that fit inside? Yes, those were locator cuts, so you could position the pipes corectly - per Moroso. I do plan on trying s set as Mr P Body has suggested - perpendicular to the exhaust flow verses parallel. With 11.2:1 CR, standard ring package and tight piston to wall clearance, I don't have blow-by issues with this motor, so I probably won't see much if any gain. Still think it would be a benifit to run negative pressure in the crankcase at all times though. Fastest 300

Re: Crank case evac [Re: 68LAR] #609100 02/10/10 09:22 AM 02/10/10 09:22 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Quote: Quote: -------------------------------------------------------------------------------- I also use a PCV valve along with my evac system. -------------------------------------------------------------------------------- Why? No, it doesn't defeat the purpose. At idle, there is a negative pressure in the crankcase due to the PCV valve. Anything above idle, there is also a negative pressure in the crankcase due to the crankcase evac. system. Just curious - do you remember how much vacuum you pulled at idle with the PCV hooked up on a closed ( not open to atmosphere )crankcase? Fastest 300

Re: Crank case evac [Re: Crizila] #609101 02/10/10 11:12 AM 02/10/10 11:12 AM
Joined: Oct 2003 Posts: 4,013 South Park, Pa. 68LAR master
68LAR master Joined: Oct 2003 Posts: 4,013 South Park, Pa.	Quote: Just curious - do you remember how much vacuum you pulled at idle with the PCV hooked up on a closed ( not open to atmosphere )crankcase? This is dependant on the cam being used. In my case with a stick car, I pull 9" at 1200rpm(idle). One thing to remember. Any negative pressure is better than a positive pressure in the crankcase. 4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight

Re: Crank case evac [Re: 68LAR] #609102 02/10/10 11:44 AM 02/10/10 11:44 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Quote: Just curious - do you remember how much vacuum you pulled at idle with the PCV hooked up on a closed ( not open to atmosphere )crankcase? This is dependant on the cam being used. In my case with a stick car, I pull 9" at 1200rpm(idle). One thing to remember. Any negative pressure is better than a positive pressure in the crankcase. 10-4 that. Fastest 300

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