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Old 10-03-2008, 12:42 PM
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Purpose of Oil Catch Can

Hi guys,

I noticed that some members have installed an oil catch can on their FI cars.. whats the purpose of having one of these and are they worth the money?
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Old 10-03-2008, 01:10 PM
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It catches the excessive build of carbon and sludge from both your engine and intake system. hmmm do I think it is worth it that I can't say. I have it on my track car and once a while when I check I get some but not a lot. Some guys made their own catch can for about $20 I think.

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Old 10-03-2008, 04:43 PM
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Highly recommended on FI cars mounted between the PCV and intake.
Without a catch-can, all that oil/carbon gunk builds-up and can cause pre-igntion (pinging) over time.
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Old 10-03-2008, 05:51 PM
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Oh did not realize that he is FI. I should have read the posting a bit more careful. If that is the case then I would suggest it. You definitely would like a healthy and clean engine.

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Old 10-03-2008, 11:24 PM
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When you're FI you're introducing positive crank case pressure. That will cause oil and fumes to spew out from the valve cover hole. A catch can will "catch" the oil and fumes.
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Old 10-04-2008, 12:31 AM
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When you're FI you're introducing positive crank case pressure. That will cause oil and fumes to spew out from the valve cover hole. A catch can will "catch" the oil and fumes.
Ya, I ended up picking up a GReddy Oil Catch Can from my local shop.. they cut me a deal on it so it was pretty cheap. Just gotta find a spot to cram it into the engine bay now.. so limited on space now

Thanks for the help guys
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Old 01-10-2009, 10:04 PM
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can you post pictures yeefit? what hoses did you connect to it?
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Old 01-11-2009, 01:06 PM
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can you post pictures yeefit? what hoses did you connect to it?
Ya, give me a couple days... the GReddy can that I bought came with hoses and it simply goes inbetween the head and the intake.

To be honest, I've had mine in for a while now and my hoses are clear and there is no sign of any oil going in so I'm not sure if its necessary. I haven't really driven my car really hard tho since its winter here and I still need to install my clutch and mounts
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Old 01-11-2009, 02:51 PM
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sugarphreak posted a picture of inside his weapon r intake and there was quite a bit of oil residue built up on the walls. i figure this is more of a safety precaution than anything.
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Yeah, I was thinking about you when i made that post. You're insane and I say go for it! you'll have the most badass fit ever.
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Old 01-11-2009, 03:32 PM
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Oil fumes also knock down the octane rating of your gas. Can cause serious problems in a FI car.
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Old 01-12-2009, 09:14 AM
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i was thining of installng an oil catch can, but dont really want the extra part to be jammed in the engine or more work...so im just going to install a breather filter on the PCV and clean it every few weeks.

anyone know of any problems io might have? im kinda new to FI...
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Old 01-12-2009, 12:26 PM
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Quote:
When you're FI you're introducing positive crank case pressure. That will cause oil and fumes to spew out from the valve cover hole. A catch can will "catch" the oil and fumes.
I agree with that statement,

A catch-can is pretty much a must on any FI vehicle. Even people with stock turbo's should be considering one, I have seen a few threads on the BMW 1-Series website that show how much stuff it actually prevents from re-entering the engine and it is gross.
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Old 01-18-2009, 03:56 PM
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so where do you connect the hoses that are routed to the catch can?
im rather new to the forced induction.
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Old 01-18-2009, 10:28 PM
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so where do you connect the hoses that are routed to the catch can?
im rather new to the forced induction.
PCV valave -> catch can -> intake

there is already a hose that connects the pcv to the intake, the catch can simply goes in-line to prevent any blow-by from entering the intake.
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Last edited by NIGHTHAWKSI; 01-21-2009 at 04:19 PM.
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