crankcase venting

[Wanderer-rrorc]

anybody ever thought about running just a filter on the end to capture most of the vapor and run it back into the timing cover..rather than having it just vent to the atmosphere...

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[GenLightening]

You can be the first to test it. On bikes they seem to do ok up to a point, then they start to let a mist out that coves to top end. Maybe if it's big enough to hold a good amount and then when it's shut down it'll drain enough?

 

[Agnem]

Not sure I follow you. You mean put a filter on an RDT? Yea, we've done that. Doesn't catch enough to make it worth while in my case.

 

[jperecko]

From the reports of others watching me... my 79 XT500 (single cylinder 500cc dirtbike) spits out quite a bit on hard acceleration but that may be due more to worn out rings as the engine is worked pretty hard.

On a diesel though... I would be concerned that there would be even more blow-by due to the higher compression. I would rather route to some kind of collector like with steel wool or somethign to catch/condense and then route the top of that to an air filter like you show at the top for actual air-flow. There is junk out there that is kinda blingy... think they call 'em "oil catch cans".

Dunno if any of this helps...

 

[88 Ford]

I have my vented just like you are thinking. Sometimes the vapors get pretty heavy and it builds up in the filter. After it builds up in the filter, it tends to start dripping onto the engine. But other than that I don't think it hurts anything.

 

[The Warden]

Something to keep in mind is backpressure. I tried using a breather cap for my crankcase ventilation, and I found that it put so much backpressure in the crankcase that blow-by gases ended up going out of my front and rear main seals.

I'd love to put a oil separator in my RDT, and after I get it plumbed into my exhaust, I might be able to....but, with the RDT just emptying into the atmosphere, I would be very wary about doing this.

Just my $.02...

 

[91f2504x4]

I had an oil catch can on my old motor (351W turbochared) to keep it from ingesting oil through the PCV. The only problem is I don't think they aer big enough for the IDI engines. They only have 3/8" inch hose barbs to route the crankcase ventilation through and I think it would lead to increased crankcase pressure and seals getting blown. Maybe you could run a couple of the catch cans or just make your own catch can using bigger piping. It wouldn't be difficult to make one. Just a container with a drain in the bottom and one pipe that runs from the top to about 1/2" from the bottom and then a 1/2" barb on top. Run your crankcase vapor to the one that runs 1/2" from the bottom and then put your intake or atmosphere on the barb, would probably be best if you put a little baffle under that barb in the container. Use some say like a tomato juice can so it would be deep enough to avoid pulling vapors through. You could also attach a couple elbow on the side. one at the top, one at the bottom, both pointing the center with a piece of clear hose between the two, as a level indicator.

Here is a picture I did in paint brush but it gives the general idea of a good catch can to use for the crankcase ventilation.

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[david85]

Any reason you couldn't use an oil trap before a CDR valve?

 

[91f2504x4]

I think it would be great between in between the engine and CDR, it would require a custom mount and piping but that wouldn't be a big deal. You could even drain the oil back into the engine every so often.

 

[NCheek]

Seems like I read about someone, either here or possibly on the other site, being successful at making a condenser apparatus with a near writeup quality description and pictures. I'll see if I can find it...

 

[69dieselfreak]

cheeper jeeper built one and he has pics to but i cant rember the thread hope he chimes in