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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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| | Subject | Poster | Date |
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crank case breather, do i need it
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ta2272 | Thu, 10 June 2004 01:09 |
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Re: crank case breather, do i need it
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RWDboy | Thu, 10 June 2004 01:32 |
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Re: crank case breather, do i need it
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Super Jamie | Tue, 15 June 2004 02:14 |
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Re: crank case breather, do i need it
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RWDboy | Tue, 15 June 2004 02:27 |
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Re: crank case breather, do i need it
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indian | Tue, 15 June 2004 02:34 |
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Re: crank case breather, do i need it
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Super Jamie | Tue, 15 June 2004 02:56 |
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Re: crank case breather, do i need it
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monkeymajik | Tue, 15 June 2004 03:00 |
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Re: crank case breather, do i need it
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M.W.P. | Tue, 15 June 2004 03:25 |
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Re: crank case breather, do i need it
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indian | Tue, 15 June 2004 03:38 |
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Re: crank case breather, do i need it
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RobST162 | Tue, 15 June 2004 03:43 |
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Re: crank case breather, do i need it
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Super Jamie | Tue, 15 June 2004 05:12 |
