crankcase breather options

[race-rodz]

this pro street 57 has issues with excessive crankcase pressure....resulting in oil leaks from the front seal(so far) its running a breather in each valve cover, with no pcv...as ther is no source of vacuum that doesnt directly affect the IAC. anybody got any ideas short of running an evac system into the exhaust?

[540]

I'm having the same issues with my 540 thinking of a electric vacum pump
but what I would really like is a morroso vacum pump but do not know if I can make it work with my March pully system maybe someone on here has?

[camcojb]

Originally Posted by race-rodz

this pro street 57 has issues with excessive crankcase pressure....resulting in oil leaks from the front seal(so far) its running a breather in each valve cover, with no pcv...as ther is no source of vacuum that doesnt directly affect the IAC. anybody got any ideas short of running an evac system into the exhaust?

I'd try a pair of remote breather tanks like the Mule and Malitude have. Basically they can be mounted hidden or in the open, look like overflow tanks with a breather on top. One #10/12 line from each cover to the remote tanks. They make aluminum ones or the plastic tanks from Jaz, etc.

If it still has too much pressure in the crankcase there's an engine issue at that point.

Jody

[race-rodz]

Originally Posted by camcojb

If it still has too much pressure in the crankcase there's an engine issue at that point.

this wouldnt suprize me at this point, but i will look for the breathers.

[70gotboost]

Had the EXACT same problem with my newly built, supercharged 388. I went to a Stef's evac. tank on the firewall with one -12 line coming out the top of the valve cover.

http://www.stefs.com/products/drysum...eathertank.htm

problem fixed!!!

[Z-man]

Is stuff coming out of the breathers? If not, it sounds to me like you've got something plugged between the top and bottom end of the engine.

[Diesel77]

Run an evac set up. I had a similar problem on an old nitrous motor combo, was blowing oil out all over the place. At first I thought I just had lots of leaks but realized it was being pushed or forced out. Weld tubes to your headers near the collectors and run lines from the breathers. This does pull a vacuum and will help pull crankcase pressure out. Just be carefull to check that its not pulling alot of oil out or you will have a mess. I put a catch can between the header tube and the valve cover breather tube to collect oil with no breather so it didnt lose the vacuum at the first breather or atmosphere source.

http://www.jegs.com/webapp/wcs/store...0002_745564_-1

[HILROD]

I am going with 2 syclone/typhoon pcv valves. Inline I'm using Jegs oil seporators and one way check valves. One valve is plummed to the stock area under the carb. The other is going into the intake pipe for the Procharger. The Syclones use the exact setup, without the check vavles or seperators. The setup from GM works O.K. except for oil consumption. Hopefully when I get my carb and get it running it'll work good.

[race-rodz]

i got a couple remote mount breather tanks from jegs, if the problem doesnt go away, then the next step will be evac the breather tanks into the x pipe right behind the collectors(hpc coated headers are harder to "touch up" than the stainless exhaust)

[race-rodz]

ok, another 200 miles after installing the remote breathers and it seems to have cured the problem.

the deal was kinda strange, throw a new set of breathers on and everything was fine, but after a couple days of driving the breathers became oil saturated(sp) and no longer "breathed". my "theory" is the remote breathers (mounted about 4' away) gives the atomized oil a chance to re-solidify before ever making it to the breather tanks. i did drain the tanks just to see if there was any oil accumulation, but found nothing more than a lil condisation moisture.... which seems "normal".

so there ya have it, so far so good, thanks for the input/suggestions.