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crankcase breather filter

  • Thread starter Thread starter Flaggo60
  • Start date Start date
paco13 said:
I run a filter and the oil trap in tha V-cover does its job well enough I don't get any spooge coming out the filter.

Think about this, the pistons and rings have a good seal in the cyl.'s.
When the piston comes down it will compress the air under it in the cases.
When it goes up, there will be a vacuum under the piston. If this were not the case we prob. wouldn't need crank case breathers. If we don't have a breather or its clogged this pressure will blow out seals.
Diaphram type carbs and fuel pumps operate off these pressure changes on some older engines.
Some modern and or performance engines increase ventilation in order to allow the engine to rev more freely with less resistance,up and down, in the crankcase.
This is why I vote for a filter. Also why the factory has it routed to the air box to breath clean IMO.
Click to expand...
engines need a good crankcase vent to relieve pressure, as mentioned above, especially on tuned engines.
whether you put a filter on it or vent it into a catch tank you cant go wrong. as said, if the breather in the cam cover gets blocked up you will increase internal pressure causing increased engine heat and more chance of your engine leaking oil as the pressure will find a way out somewhere, weak gaskets or worn seals :)
 
jacora said:
If you have oil coming from the venting hose, that is a warning of you most probably have worn piston rings which produce high blow-by that pushes oil up to the engine vent system vent.
Click to expand...

I suppose that's possible. But the bike only has 11,000 miles and excellent compression. When I say oil comes out, I'm only talking about maybe a teaspoon every 1000 miles. And it's real watery, probably from condensation. I think it's normal. I got the idea of running the hose/filter from KeithKrause. His bike is freshly rebuilt by Vance & Hines, and he gets a little goo, too.
 
oil or no oil???

oil or no oil???

It seems like nothing is coming out because there is such a minute amount over the course of time. But, if you block and trap it (as you do with a filter), over time, it adds up. (A tablespoon of oil can make a hell of a mess.)

When I had my HD, I thought nothing was coming out until I installed the filter. After I removed the oil saturated filter, it seemed like nothing was coming out again.:) (I might add that I bought it brand new and there was nothing wrong with it.)

So.....I don't think you have anything to be concerned about, Bruce.
 
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renobruce said:
I suppose that's possible. But the bike only has 11,000 miles and excellent compression. When I say oil comes out, I'm only talking about maybe a teaspoon every 1000 miles. And it's real watery, probably from condensation. I think it's normal. I got the idea of running the hose/filter from KeithKrause. His bike is freshly rebuilt by Vance & Hines, and he gets a little goo, too.
Click to expand...

Several years ago I got a car engine that was burning oil, compression was excellent meaning compression rings were in good shape, but oil rings were worn-out.
Oil consumption is acceptable up to certain level, that level varies from one to other. This shall be compared to performance level of such engine.
 
I was noticing that when I started my bike there would be a couple drops of moisture on the shift /sprocket cover. I run PODS so I kept thinking that moisture or fuel was dripping out of the PODS. I kept testing the liquid for the smell of gas but it was never there.

Problem solved: I had run a long piece of tube from the top of the engine (breather) down in front of the battery box. The tube was long enough that it had curled up and over to where it was against the left vertical frame rail just above the chain. I think condensation was settling at night and when I would start it in the morning it would blow it out of the tube ultimately spraying the face of the cover.

I trimed the tube down so it just falls vertically to the road now. I like RenoBruce's sano solution though.
 
jacora said:
Several years ago I got a car engine that was burning oil, compression was excellent meaning compression rings were in good shape, but oil rings were worn-out.
Oil consumption is acceptable up to certain level, that level varies from one to other. This shall be compared to performance level of such engine.
Click to expand...

My bike doesn't burn any oil. So as I said, I think a little bit of goo is normal. Not sure why yours doesn't spit anything out....maybe it does and you just don't notice it. Maybe your screen is blocked or gunked up? Mine was taken out and thoroughly cleaned.
 
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My gs750 motor had a bit of blowby. I had a breather filter and over time would make a mess on the engine. Than I bought a small catch can and mounted it to the left side of my frame. Click on my bike picture down below to see. After a trip to florida and back(3,000 miles), it was about 3/4s of the way full.
 
Tarbash 27 said:
My gs750 motor had a bit of blowby. I had a breather filter and over time would make a mess on the engine. Than I bought a small catch can and mounted it to the left side of my frame. Click on my bike picture down below to see. After a trip to florida and back(3,000 miles), it was about 3/4s of the way full.
Click to expand...

Tarbash,
A bit off topic, but where's your battery, up in the tail section?
 
right behind the transmission, above the swingarm. Its a smaller battery(Ytz10s).
 
renobruce said:
My bike doesn't burn any oil. So as I said, I think a little bit of goo is normal. Not sure why yours doesn't spit anything out....maybe it does and you just don't notice it. Maybe your screen is blocked or gunked up? Mine was taken out and thoroughly cleaned.
Click to expand...

Maybe I haven't notice, but recently I sent to powder coated the valve cover and took out the mesh screen to have it cleaned, for surprised it was clean and the hose was totally dry. Engines has its mysteries, for sure this is not the first time (not for me) you see inconsistencies like this one. If your bike doesn't burn oil I understand that you should not be worried by such type of residual coming out of your breather tube.
 
Actually I have found the best solution to be running the breather hose UP between the frame tubes under the tank & then putting the filter on so that whatever oil gets pushed out runs back into the breather cover. Unless the motor is PUKING oil, it aways goes back in the motor! Ray.
 
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