Engine/Transmission (1998.5 - 2002) Crankcase vent to exhaust pipe......

[TSRAM]

Those of you that have piped the crankcase vent to the exhaust pipe how far back did you go to plumb the hose barb in? I welded a steel hose barb on the ex. pipe just behind the trans. crossmember in front of the resonater.

Also what type of hose did you use? I have concerns about the heat breaking the hose down.

 

[Makensmoke]

Sounds like a mess. Does it burn off or does your tail pipe drip and your tailgate forever have rustproofing on it from all the oil vapors?

 

[barbwire]

pressure

Being there is more pressure from exhaust than crankcase pressure, Would'nt you get exhaust in the engine?

 

[CFAR]

Actually if you drilled a hole then inserted a piece of pipe in about 5 inches, pointed toward the back of the truck, you would probably get vacuum.

 

[EagleEye]

Would like more info...

I had not thought about this one yet!!! I did have the TSB done to relocate the vent from the front of the engine to the port side, and plumbed the tube to dump just ahead of my x-fer case.



I still get a bit of vapor/dirt downstream (ie tank, axle, etc. ) and occasional drips when I stop. ALOT better than in the front, but plumbing into the exhaust really has caught my eye.



The pressure in the exhaust can't raise THAT much, and the temp seems like it would keep the oil vapor in a vapor state until it is clear of the truck.



Ditto on using and eductor/pitot tube to create a 'low' pressure area if that would even be a concern. How bout it??? any other input?



May have to try this BOMB because it sounds feasable. Even if you are concerned about backflow into the crankcase, a simple low differential 'check' valve would put that to rest.



Any input???

 

[Sticks]

I 'v been pondering this as well, so long as it is down wind from anywhere an exhaust brake may get mounted.



Any concerns of it clogging up the resonator or muffler?

 

[CFAR]

How hot is it just behind the resonator?



If you could get it to burn, you would have more smoke.



And if you had too much vacuum... ...

 

[TSRAM]

I know that I've read on here that someone had already tried this. I also agree about the vacuum effect to the vapors. In the past I have know several people that used to do this on street/strip cars to evacuate the vapors.

I was curious to see if the person doing this with their truck already had any hose breakdown problems between the oil or heat.

I chose to put the hose on in front of the resonator due to the slightly higher temp in front of the only restriction in the pipe to help the oil burn off. Smoke isn't a concern to me. I think a little blue mist against the black adds a nice touch.....

 

[barbwire]

vent tube

I know of a fella that plumed the vent tube on one of his old tractors into the intake. He said that before he did that, it had always been a mess around the eng. I saw the after effect, and it was nice & clean.

 

[fox]

If you put the vent tube in the intake you may end up with it being fuel and causing a run- a - way condition. Not good! have you ever seen one do that ?



As far as putting it in the exhaust, If you want to use the pital tube first you should check the pressure difference between the crank case and the exhaust!!



The guys that do this on street cars are putting it in the headers which have a pulsing air flow and they can create a low pressure area.

 

[drawson]

This is a system used on Drag racers cars call Evac-U-Pan. It uses one way check valves that allow the crankcase pressure into the exhaust but no exhaust back into the crankcase. This system is used to try and get alittle more HP out of the engine at top end by creating a low vacuum inside the crankcase. This seals the rings better and allows the motor to rev better on top end. A couple of companies make kits with the pipe cut off at the right angle and the check valves. Mr Gaskets make one I think.



With the exhaust flow we get coming out of our mighty Cummins, I would be worried about sucking too much vaccum in the crankcase. So a means to let fresh air in would be smart.



On gas dragsters it is best to put the pipe right in the collector on the header for best results. That way the exhaust gasses are still very hot and wanting to get out and expand giving the best draw on the crankcase.



I am going to run this set up when I get my engine back together. I am looking for some high temp hose to hook to the valve. I also don't think that the twin and 5" exhaust system won't be the best to set this up on but it all I have.



Dee

 

[CFAR]

You could vary the try some different size tubes in the exhaust stream, depending on size this would allow you to vary the vacuum, then before hooking up the vent simply run a hose into the cab with a gauge attached and see what the highest vacuum reading is. Or you could hook up some type of valve on the line that would allow you to adjust the vacuum.

 

[DAWG-1]

Crankcase Evacuation

Moroso makes a crankcase evacuation system. The kit comes with oil breather (install in valve cover), weld in nipple and check valve.

If you are running high boost pressures you may need to remove built up pressure, before you blow a gasket. Sam

 

[mhenon]

Crankcase vent

Just run about 10´ of hose from the exsisting vent to the underside of the truck. Mine cost about $10. 00 to change and took all of 15 minutes. A couple of tie wraps secured the hose to the dipstick tube and then to the fuel line along the frame. Done!



Mike