drawson

Here are some pics of my crankcase vent system

drawson

ANd the filters

drawson

Here is how it works...

The piep in the exhaust is at a 45 deg angle away from the engine. As the exhaust flows by it it draws out the crankcase vapors. The one way check valve allow the crankcase vapor out but no exhaust in.

I had just one vent filter on the fill cap and with the filter off the tube and the engine at 2000 rpms there was a slight suction. So I added the tother two on #1 and #4 vlave covers.

I used this system on my race car(71 mustanf 351C) with two set one from each valve cover it would actually show about 1 1/2" of vacuum at the end of the track.

It has been in place in my truck since the rebuild and seem to be working great!!!

infidel

Dee, I've seen folks tee into the exhaust but never seen them use vent caps.
Think it's necessary?

Jeremy Cusick

I would think that a light suction in the crankcase would actually increase power/efficiency. That's why NASCAR cars run vacuum pumps on the crankcase!

wannadiesel

A light suction in the crankcase would also likely suck the tappet cover gasket in, causing an oil leak that requires pulling the injection pump to repair. I like the filtered vents because you're pulling air into the crankcase constantly, you don't want to pull dirt in with it. I'd rather have more vent capacity than less because all the seals and gaskets on the engine were developed to work with the pressure inside the engine being the same as the pressure outside. I wouldn't want pressure or vacuum in the crankcase. A really good setup IMO.

Jeremy Cusick

OK, I see where that would come into play now.

drawson

I racing they do try and get a vacuum in the crankcase to free up the motor(make it spin easier). I was after that I wanted to clean up the under side of my truck and help get rid of the vapors inside the crankcase which will hopefully keep the oil cleaner.

This was fairly easy on my 12 valve because with the angle of the tube in the exhaust I was able to run out of the vent tube on the back of the motor, over the bell housing and to the one way check valve. A 24 valve would be harder to do.

johnh

i put the MR gasket in ,but i get a small amount of pressure at an idle & 2000 rpm
what`s going on????

CDRAM

Opie and I have been using that same system for almost 2 1/2 years works great. Opie came up with the idea and checked out the amount of vacuum you would see at various rpms and which way to turn the venturi in your down pipe. I really like the added breathers in the valve covers, sweet. The 24 valve crowd cant do that, so you can put a breather into the crank case vent line that you hook up to the venturi. We also found out that this system with just a single breather in the exhaust was not enough for a twin system. That is why those breathers on the valve covers are so important. There is something new in the works, but you'll have to contact opie for that info.

CrewCabCummins

So will "ALL" trucks benefit from this or is this just needed in the Extreme HP trucks? How did you tap the valve covers and how about the part #'s for the filter's and the check valve..Thanks..

hoser

If you extend the hose down too low in the front end , it can create too much vac while driving . Ive "fixed" a few that had the hoses hangin down too low that caused oil loss and a big mess.

Meatball

could somebody post a few more pics, i need a better visual. thanks

Haulin_in_Dixie

Dave the tappet cover gasket goes on the cover like a door edge guard, could not really get sucked in.