Can I (should I) run breather can oil back to the engine?
#1
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Can I (should I) run breather can oil back to the engine?
Apologies if this has been covered, I think I've seen most of the catch-can threads here but I don't recall this being discussed. I'd have a diagram handy of what I'm thinking of but it would be MS paint and done on a laptop touchpad, so I'll spare you. Instead, I'll describe what I'm thinking of doing.
My valvecover (the spare I just picked up, for downtime's sake), with barb fittings toward the front of it, and on the top of the cover as opposed to offset like stock. Both stock holes filled.
The lines run to the car's right, off the VC and along the fuel rail, just above it. The breather is mounted to the firewall to the right of the IM, and drains down into what would be the factory turbo oil drain on the B6.
Is this a good idea, or have I been smoking the drugs?
My valvecover (the spare I just picked up, for downtime's sake), with barb fittings toward the front of it, and on the top of the cover as opposed to offset like stock. Both stock holes filled.
The lines run to the car's right, off the VC and along the fuel rail, just above it. The breather is mounted to the firewall to the right of the IM, and drains down into what would be the factory turbo oil drain on the B6.
Is this a good idea, or have I been smoking the drugs?
#3
Any drain back that sees atmospheric pressure on the other end needs to return to the sump below the oil level, very bottom of the pan Or pressure pulses in the crank case gasses will blow the oil back up the drain. been there done that.
The original B6T had provisions in the block and the pan for a crankcase vent in the side of the block and a drain back at the very bottom of the pan. See attached picture the two capped off ports roughly 5/8". Those ports have nothing to do with the turbo the drain back for the turbo is on the other side of the oil pan, the upper one is a crank case vent and the lower one is a drain back. Using the upper one as a drain back made a mess when I tried it.
I have recently added these ports for my setup and rather than venting to atmosphere I will be pulling a slight vaccum with a slash tube in the exhaust.
Bob
The original B6T had provisions in the block and the pan for a crankcase vent in the side of the block and a drain back at the very bottom of the pan. See attached picture the two capped off ports roughly 5/8". Those ports have nothing to do with the turbo the drain back for the turbo is on the other side of the oil pan, the upper one is a crank case vent and the lower one is a drain back. Using the upper one as a drain back made a mess when I tried it.
I have recently added these ports for my setup and rather than venting to atmosphere I will be pulling a slight vaccum with a slash tube in the exhaust.
Bob
Last edited by bbundy; 02-18-2011 at 01:05 PM.
#5
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I've seen what accumulates in your catch can...lol.
bbundy - Interesting.
Actually, to be on the safe side maybe I shouldn't drain back into the engine... My intent was to have a maintenance-free system but that may have been misguided.
What about pretty much the same thing, but no drainback, and tucked away in the fender?
bbundy - Interesting.
Actually, to be on the safe side maybe I shouldn't drain back into the engine... My intent was to have a maintenance-free system but that may have been misguided.
What about pretty much the same thing, but no drainback, and tucked away in the fender?
#7
The **** that accumulates in MY catch can, as previously seen by koto
FWIW, it was about 30% water, 30% gasoline, and about 30% some other crap I can only describe as some sort of oil/water mixup. Not sure I would want to put the water back into my oil after it has escaped as vapor (though theoretically, it should become vapor again at about 212 degrees ) and not sure I want the gasoline back in there thinning my oil out.
FWIW, it was about 30% water, 30% gasoline, and about 30% some other crap I can only describe as some sort of oil/water mixup. Not sure I would want to put the water back into my oil after it has escaped as vapor (though theoretically, it should become vapor again at about 212 degrees ) and not sure I want the gasoline back in there thinning my oil out.
#9
The **** that accumulates in MY catch can, as previously seen by koto
FWIW, it was about 30% water, 30% gasoline, and about 30% some other crap I can only describe as some sort of oil/water mixup. Not sure I would want to put the water back into my oil after it has escaped as vapor (though theoretically, it should become vapor again at about 212 degrees ) and not sure I want the gasoline back in there thinning my oil out.
FWIW, it was about 30% water, 30% gasoline, and about 30% some other crap I can only describe as some sort of oil/water mixup. Not sure I would want to put the water back into my oil after it has escaped as vapor (though theoretically, it should become vapor again at about 212 degrees ) and not sure I want the gasoline back in there thinning my oil out.
Bob
#10
I'm not sure how the water is there in the first place. But that's another debate. I personally wouldn't worry about draining things back in. I'd do it exactly as bbundy is. Pull a vacuum on it (as it is designed, not just an atmosphere vent) to help pull that out, and let it drain back in.
I've got an Escort GT engine in my car which has the dipstick tube at the front near the crank which will probably be where I drain mine back in eventually.
I've got an Escort GT engine in my car which has the dipstick tube at the front near the crank which will probably be where I drain mine back in eventually.
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