anyone try this for a crankcase evac set up?
Originally Posted by Project GatTagO
Originally Posted by JMBLOWNWS6
Its as close as its going to be. Since I work with a steam jet air ejector which pulls a vacuum to near perfect 1.0 INHG it works the same way. Uses steam instead of exhaust to pull the non condensables out of the condensor.
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single digit dreamer
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From: omaha ne
no, i didn't get any reading but i can tell you i have about 1000miles on this motor and i would guess 30 wot pulls and the vent filter in the valve cover is completely dry.
Are you using only 1 nipple for the evac system(passenger's side downpipe)? co'z i don't seem to see any on the driver's side downpipe, unless i'm just missing it. How bad and how much oil were you getting from your breather before this mod??? BTW...awesome truck and you do very impressive work! 
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single digit dreamer
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From: omaha ne
just one nipple. i never tried just the breather. i was tied in before the turbo and got a fair amount of oil in my intake track and intercooler. i didn't like that so much so tried this. so far so good.
Originally Posted by parish8
no, i didn't get any reading but i can tell you i have about 1000miles on this motor and i would guess 30 wot pulls and the vent filter in the valve cover is completely dry.
If you get bored and end up taking vacuum readings on it don't forget to post up, that would end the argument for good
parish do you think it needs a open air source like a breather to pull a good vaccum or do you think that capping off all the vents and using two separate evac one on each valve cover will work just fine? i might just uncap the other two that's caped and see what happens.
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single digit dreamer
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From: omaha ne
Originally Posted by red90cobra
parish do you think it needs a open air source like a breather to pull a good vaccum or do you think that capping off all the vents and using two separate evac one on each valve cover will work just fine? i might just uncap the other two that's caped and see what happens.
i have the breather in there just in case the evac unit doesn't work right. i didn't want to presureize the crank case.
I was the first one to do that on a Supra (Marko's) shortly after a national meet everyone started copying it. In reality it barely draws much vacuum, and i also had problems with check valves failing. Then again, Markos EGTs are super super super high at 1200+ rwhp.
Originally Posted by parish8
there is no reason it would need a fresh air source. pulling a little vacume might actualy help hp.
i have the breather in there just in case the evac unit doesn't work right. i didn't want to presureize the crank case.
i have the breather in there just in case the evac unit doesn't work right. i didn't want to presureize the crank case.
Yes, it will work, but the EGT's would probably damage the seals, it is afterall a "scavenge" system... The velocity of the exhaust going out the downpipe, open or not, will pull the pressure out of the bottom end. Most drag motors (old school cars) run those, I run the moroso setup on my 67, and it works like a champ. One on each header collector, and call it done! =)
sorry to raise this from the dead......
parish, i know im beating a dead horse, but any other issues come up? hows the oil consumption? are there times where oil will **** out ur exhaust? check valves working?
thanks for any input.... ive been thinking of doing this for some time now
parish, i know im beating a dead horse, but any other issues come up? hows the oil consumption? are there times where oil will **** out ur exhaust? check valves working?
thanks for any input.... ive been thinking of doing this for some time now
im also very curious how the set up has been working ie: can a guy just cap the ports on the tb /intake and tun the lines out of the valve cover into the downpipe, and how much oil do you think i would see if it was just a short open dp? i dont wanna cover the underside of the car with oil -thx neil
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single digit dreamer
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From: omaha ne
there is some oil on the firewall near the breather so i am guesing at wot it is pushing out some vapors. i dont see any oil in the exhaust pipe. there are no vapors coming out of the brether at idle or part throttle. the bottom of my truck has some oil residue on it. for me it is more important to not fill the intercooler with oil than keeping a clean underbody but it sure would be nice to have both. i drove the truck and beat on the truck a lot before i noticed any oil so it must not be a lot
so here is what im thinking plug all the ports except the two on the valve covers and run them into the downpipe as such........then where the stock oil fill cap goes install a breather
Any updates to this? I am about finished w/ my twin turbo setup on the GTO, and the PCV setup is one of the final issues to work out. I really like this idea as I'm not running cats and will have fairly open mufflers as well.