Oil fill tube: breather or no breather that is the question.

[Deerejeep]

Checking out some "bling" from bulltear as I'm nearing the point where I'll need to get started on finishing out my engine.

Why would you have a breather or not on the oil fill tube?

http://www.bulltear.com/catalog/product_info.php?cPath=21_35&products_id=187

Glamour shot of the 360.





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[CJ]

You need a breather. I plug mine on the intake an put it on the valve cover.

 

[Saddle Tramp]

In the old days the breather was on the valve cover as CJ has done or there was a vent tube out of the side of the block, both of which expelled the crank case gases into the atmosphere. As pollution standards came into play the PVC value arrived and the gases were routed to the intake to be burnt in the cylinders.

 

[Deerejeep]

I've got the non EGR intake so It would be a good idea to vent as CJ has, right?


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[Jimbos76cj]

I would leave it on the intake.

 

[Deerejeep]

So get the vented oil fill tube?


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[007]

So get the vented oil fill tube?


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Wherever you let it breathe it will have an oily residue and collect dust and dirt as a result, so expect that. Wipe it every time you park it and you'll have no problems.

That said, I don't know what your plans are for the Jeep but you could vent it elsewhere, even to a hose zip-stripped down the firewall pointing to the ground. This would help keep the motor clean, but it will drip oil from that line at some point as it will collect in lining of the hose. I've also seen where folks have do as I've mentioned into a catch can so those eventual drops never hit the ground.

Either way, so long as it vents somewhere.

 

[Jimbos76cj]

So get the vented oil fill tube?


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I think in your case your 2 options are
a) get the vented tube
b) Change to a valve cover that has a breather hole already cut out for it.

 

[Jimbos76cj]

Are you running a set of headers? If so there are companies that make a PVC system that uses exhaust flow through your headers to scavenge the pressure build up instaed of sucking it back into the carb and motor. I think the Flow from this type of system is alot better then the suck of the carb and it will reduce oil from coming out of your pipe. I would end up being just a filtered vent hole.

 

[Hedgehog]

There are some emissions devices that aren't really all that bad.

 

[Deerejeep]

I think in your case your 2 options are
a) get the vented tube
b) Change to a valve cover that has a breather hole already cut out for it.

Thanks Jim, I was talking with an engine engineer tonight and he mentioned the same two paths you have listed. I decided to go with the vented tube. Currently the valve covers are not vented but, could be drilled to do so.

Are you running a set of headers? If so there are companies that make a PVC system that uses exhaust flow through your headers to scavenge the pressure build up instaed of sucking it back into the carb and motor. I think the Flow from this type of system is alot better then the suck of the carb and it will reduce oil from coming out of your pipe. I would end up being just a filtered vent hole.

I've got Hedman in frame headers awaiting install. I did look up the non EGR intake and it is setup with a PCV, so if my newbie understanding is correct with the decisions I've made. I should be good with the fill tube vented and the PCV valve.

Appreciate the help here Jimbo, It really helps.



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[Deerejeep]

There are some emissions devices that aren't really all that bad.

Like EGR?


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[Hedgehog]

Yeah know what, I'm not sure about the EGR valve. I do know what it does, I also know that some have said it was a great leap forward in emissions controls becoming less a nuisance to mileage and power. No matter what your engine needs to breath and a PCV valve seems to work well. By-the -way, I've heard that the breather on the oil fill tube is actually lets air in not out. The EGR valve and PCV control air flow out.

 

[Deerejeep]

Decided to order the tube with breather so we'll see how it works out. Appreciate all of the input.


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[Hedgehog]

It will have a hole with a pipe on it with a filter inside. That's about all.

 

[Saddle Tramp]

The EGR valve is not a bad thing and in fact helps keep the cylinder combustion temps down increasing engine life with little cost to performance. I would keep it.

 

[ThisGuyUKnow]

While we are on the subject. What is it the egr valve actually does? I understand the PCV valve I have that is located on the passenger side of my intake pushes the gas build up into the intake to be burned off. The egr valve is also hooked up so that the intake is pulling in its discharge. Whats the difference?

 

[Posi]

The PVC applies a controlled amount of vacuum to give the combustion gases a way out so they won't blow out our seals.

The EGR opens when you accelerate to allow exhaust gas to flow back into the combustion process through the intake manifold. When the engine is hot fuel can burn too quickly and not burn completely. The results can cause spark knock, (when the fuel ignites before the plugs spark).

Under certain conditions you need to slow the burn of the fuel, so it's a more complete burn, and at the right time. That is why you introduce exhaust gases into the combustion process, to slow the fuel combustion just a little, so you can get a more complete burn, improve fuel efficiency, and reduce spark knock.

Hope this helps

 

[mtnwhlr]

So if I'm understanding this if the EGR isn't working it could cause your motor to run rich? I have a real hard time getting mine to pass emmisions because its running to rich and never thought about the EGR as being the problem.

 

[ThisGuyUKnow]

The PVC applies a controlled amount of vacuum to give the combustion gases a way out so they won't blow out our seals.

The EGR opens when you accelerate to allow exhaust gas to flow back into the combustion process through the intake manifold. When the engine is hot fuel can burn too quickly and not burn completely. The results can cause spark knock, (when the fuel ignites before the plugs spark).

Under certain conditions you need to slow the burn of the fuel, so it's a more complete burn, and at the right time. That is why you introduce exhaust gases into the combustion process, to slow the fuel combustion just a little, so you can get a more complete burn, improve fuel efficiency, and reduce spark knock.

Hope this helps

So the EGR pulls exhaust from the headers?