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PCV valve and breather cap

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ratta tat tat
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2010/11/20 14:33:13 (permalink)
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PCV valve and breather cap

I have put a sidedraft weber on my 1600 kent, and there's no provision on the inlet manifold for the PCV hose. I just run a bit of short hose from it to a mini air breather. Would it be best to leave the PCV valve in place or remove it and push the hose directly into the oil seperator? If there's no vacuum from the manifold, the PCV valve would remain open at all times anyway wouldn't it?

And the breather cap on the rocker cover has provision for a hose, and my air filter has an inlet for it, so would it be best to run it to the air filter or just let it vent to atmos?

Thanks
#1


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    qcadta
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    RE: PCV valve and breather cap 2010/11/21 19:00:12 (permalink)
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    take the pcv out and do as you said with the mini breather, wouldn't want it staying closed and pressurising your crank case.
    #2
    ratta tat tat
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    RE: PCV valve and breather cap 2010/11/22 00:38:26 (permalink)
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    yeah cheers. I found some heater hose that slotted in there nicely. I'm just waiting for the $8 breather from ebay and it'll look great. I'm also going to swap my redline air cleaner for ram tubes and foam unifilters because the redline housing hits the firewall when the engine is running. So now, no option of taking a hose from the breather cap to the carb. I'll just let it vent into the engine bay,, the cap has a filter in it anyway.
    #3

    ratta tat tat
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    RE: PCV valve and breather cap 2010/11/30 22:10:31 (permalink)
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    So, I'm amazed how much pressure and heat/gasses come from the oil seperator hey. The PCV valve is completely removed and I'm still waiting on the filter (ebay)

    I had another look at the vacuum connections on my removed 1300 engine and noticed the PCV line and brake booster vacuum line joined into the same T-peice on the inlet manifold. At first it seemed like a good idea to do the same on my 1600 until I discoved that the barb on my new manifold is tapped into only 2 of the runners (because it's a Lynx "crossover" manifold). I've read it's a bad idea to run the crankcase breather line into a manifold where the runners won't be balanced. On the 1300 the barb is just below the carb so the gasses would distribute evenly into all 4 runners.
    So it looks as though the only option is to stick with the current set up.
    #4
    premacist
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    RE: PCV valve and breather cap 2010/03/12 11:54:00 (permalink)
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    you should fit the PCV ot the replacement hose on the vacuum side of the air cleaner---
    the brake booster vacuum line must be fitted to a good vacuum fitting the PCV valve ti the air cleaner leaves the vacuum in the manifold.for the brake booster ok that good

    but if you need to fit a alternator from a diesel car or diesel truck some have a vacuum pump fitted on the back of the alternator use this for you brake boster----
    #5
    ratta tat tat
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    RE: PCV valve and breather cap 2010/03/12 19:01:57 (permalink)
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    As you can see, the K&N filter has no provision for any hoses. Plus the only hose that is acceptable to run into a K&N/Redline style filter would be from the breather cap on the rocker cover. There's too much volume and oil in the PCV line to run into an air filter which would clog up the carb. And the valve wouldn't work anyway because there's insufficient vacuum in front of the venturis. It needs to have vacuum from the manifold to work correctly.




    #6

    premacist
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    RE: PCV valve and breather cap 2010/08/12 14:35:38 (permalink)
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    i se the fit would be a problem i fitted a hose from thr sump ot the vacuum side of the air cleaner this worked i not have thePCV valve in the line i left it out on both the zepher 6 nad the escoer 1600 sport. --- what is wrong with fitting a T fitting in the vacuum hose in the frount of the manifold---
    #7
    ratta tat tat
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    RE: PCV valve and breather cap 2010/11/12 19:33:08 (permalink)
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    quote:
    Originally posted by premacist

    i se the fit would be a problem i fitted a hose from thr sump ot the vacuum side of the air cleaner this worked i not have thePCV valve in the line i left it out on both the zepher 6 nad the escoer 1600 sport.

    I guess your air filters would've stayed nice & oiled at all times :-)

    quote:
    Originally posted by premacist

    --- what is wrong with fitting a T fitting in the vacuum hose in the frount of the manifold---


    Because the barb on my "crossover" manifold (see link
    http://vesquared.com/ramflo/manifolds.htm )
    only flows into two of the runners. The blow-by needs to be distributed evenly across all four runners.
    #8
    premacist
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    RE: PCV valve and breather cap 2010/12/12 11:58:37 (permalink)
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    I guess your air filters would've stayed nice & oiled at all times :-)
    well no
    I welded a fitting on the inside of the air cleaner so any oil went strat into the carb-- and there is a better vacuum on that side of the air cleaner----hope that clears that-----
    ---------------------------------------

    Because the barb on my "crossover" manifold (see link
    http://vesquared.com/ramflo/manifolds.htm )
    only flows into two of the runners. The blow-by needs to be distributed evenly across all four runners.

    OK i see--- you may have to fit 2 PCV valves or 2 non return valves and a T fitting .....MAYBE
    #9
    Roger Miller
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    RE: PCV valve and breather cap 2010/12/12 21:35:40 (permalink)
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    http://www.rsmotorsport.com.au/forums/viewtopic.php?f=8&t=627

    http://www.knfilters.com/filteraccess.htm









    #10
    ratta tat tat
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    RE: PCV valve and breather cap 2010/12/12 21:54:07 (permalink)
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    Thanks for the extra info Rodger. I'll most likely use an oil catch can. Venting it to atmos will be okay according to ADR27A, my escort is 1970 model.
    #11
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