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Location:
qld
Registered:
May 2003
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crank case breather, do i need it
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Thu, 10 June 2004 01:09
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i have a breathe working on the tapper cover, thought my crank case breather has been blocked of on my 2tg shoudl i install one of these, and run it to a oil cacth can which i am intalling soon.
thanks
jason
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Location:
South Australia
Registered:
July 2002
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Re: crank case breather, do i need it
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Thu, 10 June 2004 01:32
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Yeah why not.
(short answer)
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On Probation
Location:
North East NSW
Registered:
December 2002
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Re: crank case breather, do i need it
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Tue, 15 June 2004 02:14
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does the the crankcase breather go to anywhere (such as hose or air cleaner)? does it go beneath the carb via a pcv valve? if it's the former, a breather on its own doesn't really matter, i've torn mine off and am using one of those little chrome redline filters
but if we're talking a pcv system then it's a good idea to keep it, as your oil will foul a LOT quicker without it hooked up, which isn't good for engine lubrication and longevity. if you don't like the idea of crankcase gases in your combustion chamber, you can run one of those $1 fuel filters inline to clean the air up. or you can go to the trouble of installing an oil air separator (catch can). i personally think a catch can works a lot better with engine vacuum still hooked up to it, some people beg to differ
hope this helps
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Location:
South Australia
Registered:
July 2002
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Re: crank case breather, do i need it
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Tue, 15 June 2004 02:27
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That's the longer answer! I pretty much agree with everything in there.
I'll second that getting a catch can (oil/air separator if you like technical sounding terms) is a good idea.
We have a catch can set up on the Mk II Escort rally car without vacuum and it seems to work well enough. I can see how the vacuum could (and would) help. It's all up to personal preference.
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Location:
south east - melbourne
Registered:
March 2004
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Re: crank case breather, do i need it
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Tue, 15 June 2004 02:34
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OK AS FAR AS I KNOW THE OIL CATCH CAN GOES IN THE MIDDLE OR SOMEWHERE ON THE BREATHER HOSE
whats the vaccum got to do with that
sorry just dont know much about it and like to know
cheers
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On Probation
Location:
North East NSW
Registered:
December 2002
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Re: crank case breather, do i need it
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Tue, 15 June 2004 02:56
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a pcv system (positive crankcase ventilation) uses manifold vacuum to suck dirty air (oil vapours, blowbym etc) out of the crankcase and puts it in the manifold where it travels into the combustion chamber and is burnt during ignition. it does slightly pollute the air fuel mixture, but not much, though that gets worse as your engine gets old and shagged out
the system uses a valve (called the pcv valve) to regulate when the dirty air can flow into the manifold. crankcase air is allowed into the manifold under high vacuum (idle, deceleration, cruise). the valve stops the flow of air under low/nil vac conditions (acceleration) so you get a good air fuel mix when required
just putting a crankcase breather on instead of the PCV valve did nothing for me in my 4K. maybe that's the way K motors are designed, they do have a baffle in the tappet cover, which i removed but it just made a big mess as oil splashed up from the rocker gear. other engines may be different, but if i ran a catch can i'd be using manifold vacuum to help suck air into it
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Location:
Brisbane
Registered:
February 2003
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Re: crank case breather, do i need it
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Tue, 15 June 2004 03:00
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One little note, not all systems have a valve, 4ag* engines just have a straight through line.
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: crank case breather, do i need it
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Tue, 15 June 2004 03:25
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BTW... having negitve pressure (a vaccumm) in the crankcase increases slightly engine performance (stops blow-by), helps to stop oil leaks, and increases oil life.
Set it up properly... there is a good reason why they do it from the factory.
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Location:
south east - melbourne
Registered:
March 2004
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Re: crank case breather, do i need it
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Tue, 15 June 2004 03:38
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ok i have a 1g-gte engine series 2 what the hell is in that motor , im pretty surei didnt notive a pcv valve ,
should i just cut the hose going from the throttle body to the turbos and join the catch can there
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Location:
Epping, Sydney
Registered:
April 2003
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On Probation
Location:
North East NSW
Registered:
December 2002
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Re: crank case breather, do i need it
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Tue, 15 June 2004 05:12
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i guess a 4age and 3sge are going to be cleaner internally running motors (than my 1960s-tech 4k anyway), as they have smaller less-floaty rings and probably alot tighter clearances, so the need for a pcv valve on a standard motor wouldn't really be there
however, do some (real) mods to one of these modern motors, and i'd definately agree that an inline fuel filter or vacuum-assisted catch can would be the way to go. you'd probably even add another 50000+km to the life of the engine by running one from new, if you fancy driving your 4a into the ground
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