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Oh, another thing I gorgot to mention. I do not think my cam will pull enough vacuum to have an effective draw for a PCV system (259 267 @.050 .672 lift and 108 lsa installed on a 104). I do not like the idea of drwing oil back into the intake tract myself.
To the O.P.
I am running a crankcase evac on my car. It pulls vacum throughout the entire rpm range. Including idle. Dont get the Mr Gasket kit, as you need the tubes with the cut in them like the ones from moroso. If installed correctly they will work.
The only thing I did as far as my WB O2 was to put the tubes and checkvalves downstream of the 02 sensor. With the FAST system, I just put the sensor in one of my collectors, and the tubes about 8" past the 02 bungs in the pipe that joins to each header. Works great as long as you dont go too far back with the tubes.
Almost forgot... These do not work very well with mufflers. They work good with my straight through Dynomax bullet, but anything less than a 'straight through' muffler will introduce backpressure. Backpressure will slow the velocity enough to stop the venturi effect from creating a vacuum.
either run a catchcan inline or just simply put the sensor in front of the tube for the evac...or better yet...both.. crankcase evac systems do work great.. but then again a belt pump would be best
I peronal think the header evac system is marginal at best. I bought one for my car but never got around to putting it on because I plan to put exhaust back on the car and do a little street driving. Running a pcv into the intake is not a choice for any cars starting to make a little power because blowbye is going to happen some. A tight n/a combo you might get by but any type of power adder is going to need a little more ring gap.
I would get an electric or mechanical vacuum pump so you know it will do what is needed.
I run a 40 series Flowmaster muffler of the 4" variety w/ my evac and it pulls vacuum. I guess it just depends on the vehicle. The catch cans I ran prior rarely collected anything if anything at all so I wasn't sure they worked or not. If I ran breathers I'd get oil mist in the bay but why that same stuff wouldn't collect in my morosso catch cans I have no clue.Quote:
Originally Posted by Fire67
My bullet is a 4" as well. I had a 4" mufflex catback with a Spintech muffler at one point. That did not pull vacuum at idle at all. Not sure about higher rpm, as my check at idle scared me enough to go another route.Quote:
Originally Posted by The SRZ
Thanks for the replies everyone. I went ahead and got a GZ crankcase vaccum pump kit for my setup.
Wow good job. Go from the cheapest "it works" setup to the all out expensive gauranteed to work setup!
I try to save money where I can but I never skimp on parts that are needed!Quote:
Originally Posted by Fire67
Your going to be glad you got the pump.