I am getting ready to address my exhaust system.

I have bought basicaly everything I need to do so, but I have some questions on how this is going to go together.

I have a Mister Gasket crankcase evacuation kit.
Mufflex 4" exhaust with a Spintech muffler.
Muffles 3" to 4" y-pipe for Hooker LT's.
Kook's 1-3/4" stepped to 1-7/8" headers with 3" collectors.

The y-pipe is wrong and there is a space between headers collectors and the flange on the y-pipe. I am going to make an intermediate pipe to connect the two pieces and in that I want to plumb in the evacutation system.

I have heard that you do not want this type of crankcase evacuation system before the muffler due to pressure...basically your exhaust will blow in your motor.

Any thoughts? I know it will consume a little more oil, but I don't care about that.

 

i was under the impression that type of crankcase evac was only for open header drag cars and not suitable for street cars.but unfortunately can offer no more information on the subject as i have never run one.

 

Have run them with streight through header muffler's and no bad effect. This was a trailer queen.

 

this is what i thought it only worked on. like the 90% of NHRA comp classes that run em.

 

strangly enough I talke to a guy who had that system on his mid 80's buick with a sbc in it.. I noticed it was a street car with dual 3in ex and flowmasters.. so I asked him if he had any trouble with the system because I heard the same thing about them not working due to pressure.. this is what he said

"the work great with the full exhaust system. A vacume is created in the hose running to the valve covers because of the low pressure zone created around the piece inserted into the collectors."

he also told me that if they wernt installed at the propper angle and in the highest velocity area of the header that they wouldn't work. I am going to use the same system on my car when I get it together but havn't tried it yet. I did see the car run and checked out the valve covers and heads before and after. no smoke visible blow by or oil residue on the engine.

 

I have used the pan evac system before but question your reasons for doing so,I have run well into the 9's with a stock pcv system with no problems. The major disadvantage to running a Mr gasket style pan evac system is there is no vacuume at idle. Im now using a vacuume pump but only because im running "race" low tension rings.

 

I plan on running an electric vaccum pump...but only for my brakes.

I don't expect much vaccum at idle.

My oil rings are 3mm low tension.

It is a proven power increase if setup correctly.

 

What I mean is you will have no crankcase vacuume at Idle there for no evac of built up crank case pressure at idle. if you plan on running your vehicle on the street at all you might also consider running a pcv to vent crank pressure during extended idle periods. With low tension rings and no evac at idle you run the risk of washing the rings with oil from the crank case.