Posted By: all spooled up
pcv or evac for a turbo engine - 09/04/11 03:56 PM
i have a small block twin turbo combo going together what too do for pcv???????????? thanks
pcv or evac for a turbo engine
Posted By: Runnoft
Re: pcv or evac for a turbo engine - 09/04/11 04:16 PM
If you can't run a vacuum pump (i.e. a street car), I would run a AN-10 vent line from each valve cover to two puke cans. One for each bank. No PCV. No Evac.
Posted By: CUUDAK
Re: pcv or evac for a turbo engine - 09/04/11 11:14 PM
Quote:
If you can't run a vacuum pump (i.e. a street car), I would run a AN-10 vent line from each valve cover to two puke cans. One for each bank. No PCV. No Evac.
That may work but if there is any pressure in the crankcase it could(more likely will) blow out every gasket in the engine. I will be using a setup like I had on my 8 second Falcon but only on one of the valvecovers and a filtered vent on the other valvecover like this,
http://cgi.ebay.com/ebaymotors/EVAC-SYST...=item1e66944596
My
Posted By: Revhard
Re: pcv or evac for a turbo engine - 09/05/11 07:20 AM
Those will work, but I wouldn't run them on a boosted motor. The reason being is they have been known to dump oil into the exaust. Also have been known to keep one from passing smog ( not every one on here deals with that, just saying ). Catch cans have always been the way to go, and to pass the smog route intake pipe before turbo with air filter and from catch can to turbo air filter pipe. If run with just a filter they say you are just venting.
Posted By: all spooled up
Re: pcv or evac for a turbo engine - 09/05/11 04:20 PM
this is for a drag car only any other ideas thanks
Posted By: 70Cuda383
Re: pcv or evac for a turbo engine - 09/05/11 05:16 PM
obviously a PCV won't work under boost, but on a street car, you're only under boost at WOT, and at part throttle cruise w/ manifold under vacuum 98% of the time.
if you have a breather on one side, that would allow pressure to breathe out under an extended WOT pull, but the PCV would open up as soon as you lift and go into vacuum on the manifold.
I'm just starting to learn about boost as I help a buddy put together a forged 5.9L to toss a turbo on in his Dakota....I know that boosted motors need a larger ring gap than NA, but if you're getting so much pressure that it can't breath out of a breather filter plug in the valve cover and starts pushing out gaskets and seals...wouldn't that mean you have too MUCH ring gap/blow by?
if you have a breather on one side, that would allow pressure to breathe out under an extended WOT pull, but the PCV would open up as soon as you lift and go into vacuum on the manifold.
I'm just starting to learn about boost as I help a buddy put together a forged 5.9L to toss a turbo on in his Dakota....I know that boosted motors need a larger ring gap than NA, but if you're getting so much pressure that it can't breath out of a breather filter plug in the valve cover and starts pushing out gaskets and seals...wouldn't that mean you have too MUCH ring gap/blow by?
Posted By: Revhard
Re: pcv or evac for a turbo engine - 09/06/11 05:52 AM
Quote:
That may work but if there is any pressure in the crankcase it could(more likely will) blow out every gasket in the engine. I will be using a setup like I had on my 8 second Falcon but only on one of the valvecovers and a filtered vent on the other valvecover like this,
[url=http://cgi.ebay.com/ebaymotors/EVAC-SYSTEM-CRANKCASE-VACUUM-DRAG-RACE-EVACUATION-/130570012054?pt=Race_Car_Parts&hash=item1e66944596]http://cgi.ebay.com/ebaymotors/EVAC-SYST...=item1e66944596l]My
Then just use these. Just make sure they are away from any oil being thrown around under the valve covers and the tubes are pointed AWAY from the exaust. Which Im sure you already know. BUT catch cans can be made with almost anything, and I've seen them made with rockstar cans to beer cans. A real simple deal honestly, you could even make your own custom, and may have the stuff laying around to do it.
Posted By: CUUDAK
Re: pcv or evac for a turbo engine - 09/06/11 02:52 PM
Quote:Quote:
That may work but if there is any pressure in the crankcase it could(more likely will) blow out every gasket in the engine. I will be using a setup like I had on my 8 second Falcon but only on one of the valvecovers and a filtered vent on the other valvecover like this,
[url=http://cgi.ebay.com/ebaymotors/EVAC-SYSTEM-CRANKCASE-VACUUM-DRAG-RACE-EVACUATION-/130570012054?pt=Race_Car_Parts&hash=item1e66944596]http://cgi.ebay.com/ebaymotors/EVAC-SYST...=item1e66944596l]My
Then just use these. Just make sure they are away from any oil being thrown around under the valve covers and the tubes are pointed AWAY from the exaust. Which Im sure you already know. BUT catch cans can be made with almost anything, and I've seen them made with rockstar cans to beer cans. A real simple deal honestly, you could even make your own custom, and may have the stuff laying around to do it.
You can still use the catch can with the evac setup. Problem solved.