Oil catch can? Can someone just tell me purpose?If its a must to have?And how to install one?TIA
03-25-2003, 07:15 PM
#2
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Not a must, but highly recommended...
basically, the stock system is designed to produce a vacuum in the crankcase.
This does two things:
1. promotes better ring sealing
2. helps keep gas fumes and combustion by-products out of the oil
Unfortunately, the system can suck oil out of the crankcase, and into the intake system. If oil gets into the combustion chamber under boost, it can cause detonation.
An oil catch can will keep oil out of the intake tract, and also keep boost out of the crankcase
This does two things:
1. promotes better ring sealing
2. helps keep gas fumes and combustion by-products out of the oil
Unfortunately, the system can suck oil out of the crankcase, and into the intake system. If oil gets into the combustion chamber under boost, it can cause detonation.
An oil catch can will keep oil out of the intake tract, and also keep boost out of the crankcase
03-25-2003, 08:55 PM
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The bad thing about the stock setup is
when you increase the boost, you also increase that vacume at the crank case. This will cause more oil to come out and also increase a chance of blow by.
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03-26-2003, 06:48 AM
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more vacuum in the crankcase is a good thing....
That's why a lot of race engines use a vacuum pump.
What's probably happening is the increased boost is leaking past the rings and pressurizing the crankcase, or it's leaking past the PCV valve and pressurizing the crankcase.<ul><li><a href="http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1761&prmenbr=361">Vacuu m pump</a></li></ul>
What's probably happening is the increased boost is leaking past the rings and pressurizing the crankcase, or it's leaking past the PCV valve and pressurizing the crankcase.<ul><li><a href="http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1761&prmenbr=361">Vacuu m pump</a></li></ul>
03-26-2003, 06:55 AM
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It's not that hard....
if you get the coolant tank out of the way, you should be able to get in there. At most the intake manifold would have to come off.
I used an NPT to AN adapter (the blue piece):
<img src="http://www.wideopenwest.com/~xr4tic/audi_crank_breather_lo.jpg">
I don't remember the size though.
The PCV valve is the white valve in the Tee
I then ran Aeroquip hose to a JAZ breather can.
The JAZ unit is pretty big, so you might want to find something smaller.
The GReddy catch can is another option, that can even be plumbed back into the intake system (pre-turbo)
I used an NPT to AN adapter (the blue piece):
<img src="http://www.wideopenwest.com/~xr4tic/audi_crank_breather_lo.jpg">
I don't remember the size though.
The PCV valve is the white valve in the Tee
I then ran Aeroquip hose to a JAZ breather can.
The JAZ unit is pretty big, so you might want to find something smaller.
The GReddy catch can is another option, that can even be plumbed back into the intake system (pre-turbo)