Race Car PCV setups
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Race Car PCV setups Anyone here using vac pumps or bungs on open headers for their PCV?
If so how do you find it?
Also has anyone here blocked off the stock PCV port and vented each valvecover to atmosphere? (With through filters on the valvecovers or T-ing the lines together to a single filter?
Any noticable power issues or ring flutter as a result?
I am more curious than anything
If so how do you find it?
Also has anyone here blocked off the stock PCV port and vented each valvecover to atmosphere? (With through filters on the valvecovers or T-ing the lines together to a single filter?
Any noticable power issues or ring flutter as a result?
I am more curious than anything
I am running no PCV system on my car. I am just running one breather on the passenger side valve cover. So far i have not had any problems with oil blowing out of the breather or anything else.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
I ran breathers in each cover with an LS6 PCV to the intake from the top of the crank case. I only had issues with pressurizing the crank case while spraying 300. No pressurization issues with a 200 shot, if that helps you any. I'm switching to a vacuum pump and relief valve (Moroso) after talking to Mikey about it before. Should work out a lot better, but it will require you to sacrifice your power steering pump or the air conditioner if you are going to get a belt driven one. The Moroso pump is about as big as the alternator.
TECH Enthusiast
Joined: Feb 2002
Posts: 551
Likes: 0
From: chicago
I had a blow by issue when I first built my engine and had it dynoed at Speed inc. I had them install a breather in the pass side valve cover and after 1000 mile break in no more blow by. I to am looking into installing a moroso vac pump. there is no room so I was thinkig of mounting it like a pro charger back wards in front of the alt. anyone try this or have any opinions?
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Rich, you can easily do that if you have the space. You'll have to fabricate a way to locate it up. They provide you with a very nice universal bracket. You just need to come up with a way to mount that to the block. Order it with a gimler pulley and then get an ATI balancer (assuming you do not have one). Peterson makes a gimler drive for the front of an ATI balancer that should bolt right up. You need to have 50% drive reduction for the pump to work optimally. The Moroso pump spins in either direction, just that the pickup flip-flops from one side to another. So, running it that way should not be too much of a problem.
What about on my N/A setup..
Could I just get rid of PCV all together ad run duel breathers,I have stepped breathers that wont leak because there high enough out of the valve cover just waiting to go back on my car.
Could I just get rid of PCV all together ad run duel breathers,I have stepped breathers that wont leak because there high enough out of the valve cover just waiting to go back on my car.
Chris, I know what you are talking about, a friend of mine runs pro mud drags, and has the line hooked up on both sides from the valve covers to the headers to suck out the crankcase pressure. I'm sure that it would work on our cars, but I don't know if it is needed, at least not for a street car. He is running a 632 CI big block chevy w/ 1000 HP of nitrous on alcohol, so the pressure is a real problem. In our cars, it's probably not, unless you are spraying alot like what DERTY was talking. Then, it may work good, probably alot less crap to instal than a moroso vacum pump, which is what my friend used to use on a milder motor.
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Originally Posted by JL ws-6
Chris, I know what you are talking about, a friend of mine runs pro mud drags, and has the line hooked up on both sides from the valve covers to the headers to suck out the crankcase pressure. I'm sure that it would work on our cars, but I don't know if it is needed, at least not for a street car. He is running a 632 CI big block chevy w/ 1000 HP of nitrous on alcohol, so the pressure is a real problem. In our cars, it's probably not, unless you are spraying alot like what DERTY was talking. Then, it may work good, probably alot less crap to instal than a moroso vacum pump, which is what my friend used to use on a milder motor.
Chris
Yeah, it's open headers....2.25 in primarys into 4.5 inch collectors. It makes about 2800HP on the bottle. Too bad it's in a pro mod mud/sand drag car. They only go 300 feet, he does it in about 2.7 seconds I think. The new motor setup is actually slower than the milder one he had, too much wheelspin now, but the rooster tails are cool to watch, as they throw mud/sand well over 500 feet.
Unfortuately, the ls6 setup isn't all that different. Most people that switch the ls1 to the ls6 setup really don't stop the oil issues. If it's better crankcase venting that you are after, just add breather's to the valve covers. I have been trying to get someone to make a cap that will fit the stock oil spout on the head ( plastic one ) that has a breather on it, something that would just replace the oil filler cap. But, if you really have a need, the moroso pump would probabyl be the way to go. Too bad that noone makes a setup like that that runs off an electric motor, that way there wouldn't be and added HP loss form another belt being driven off the crank.
How about with the other side of FI?? A blower car like mine. I had problems with pressurizing the crankcase on my old motor. Right now im running a 6.0L valve cover witht he nipple on it still rand the stock way with the check valve up by the the TB. Would it be better to just run it to a catch can?? Im just trying to get some idea's for both sides of the house.
Kyle
Kyle
With a FI motor, I would think that the PCV system really wouyldn't work at all, the check valve that you put in the PCV line will stop the FI air from backfeeding, but it also stops pulling vacum from the crankcase as well. a breather setup would probably be your best bet. I would be curious to see if anything was caught in a catch can setup on a FI car with a check valve in place. Another option would be a moroso like pump for crank case vacum, but again, that's another pulley, and with FI, there's probably not much room, if any for it. Again, an electric version of a moroso vacum pump would be a good idea.
Originally Posted by JL ws-6
Chris, I know what you are talking about, a friend of mine runs pro mud drags, and has the line hooked up on both sides from the valve covers to the headers to suck out the crankcase pressure. I'm sure that it would work on our cars, but I don't know if it is needed, at least not for a street car. He is running a 632 CI big block chevy w/ 1000 HP of nitrous on alcohol, so the pressure is a real problem. In our cars, it's probably not, unless you are spraying alot like what DERTY was talking. Then, it may work good, probably alot less crap to instal than a moroso vacum pump, which is what my friend used to use on a milder motor.
I'm having my engine done @ ARE presently. It's gonna be pretty much the same setup as Chris, except a slightly more aggressive cam, and an LSX-90 instead of LS6... also going Z06-85mm MAF. Headers are same specs, but Kooks... yet, I'm putting a TNT-DP kit w/ independant fuel-system on it... we're gonna be jetting it @ +300hp... I've been really woundering about the PCV issues and have no clue what should be done in my situation to avoid issues... I was thinking about getting the track PCV setup + catch-can... but will that be enough ?
HELP...