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Thread: ProVent 200 Control Valve - does this make the factory PCV not required?

  1. 6th July 2017, 05:09 PM #1
    twr7cx
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    Question ProVent 200 Control Valve - does this make the factory PCV not required?

    So the ProVent 200 has a Control Valve on the side. I assume this is a Mann + Hummel version of a PCV. [of interest is that for the 100 and 150 models it is referred to as a 'Pressure-relief valve' in their documentation at < https://www.mann-hummel.com/fileadmi...nt_en_2013.pdf >, but then for 200 a 'Control Valve' and 400 and 800 units don't seem to have one, as to what the difference is though?].

    Since the ProVent 200 has a PCV built into it, is the Land Rover PCV still required or can this be removed from the system?e.g.



    Having both could perhaps cause issues, as the ProVent PCV opens when pressure inside the ProVent reaches a certain level, then this pressure has to reach and open the LR PCV. But now that the pressure is on both sides of the ProVent PCV wouldn't it be canceling itself out and therefore the ProVent PCV's internal spring would shut the PCV? Maybe my head is just over complicating it...
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  2. 6th July 2017, 06:59 PM #2
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    sierrafery
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    ...the ProVent PCV opens when pressure inside the ProVent reaches a certain level, then this pressure has to reach and open the LR PCV....
    IMO you thought it the other way around... you can bin the original DCV cos the provent's DCV(depression control) not PCV(presure control) is enough provided it's working well which means it's nomally open and it must close as to limit depression in the crankcase.... actually the DCV is actuated more by the sucction of the intake than by the blow by gasses. When the turbo spools up and the suction pressure increases, the turbo will draw heavily on the crankcase gasses and without this valve it could suck out all the oil, the DCV responds to the increased vacumn draw and closes off the outlet to the intake till the pressure returns to normal as to maintain crankcase venting at an acceptable level if you see what i mean
    Discovery Td5 (2000), manual, tuned
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  3. 6th July 2017, 08:01 PM #3
    discorevy
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    Quote Originally Posted by sierrafery View Post
    IMO you thought it the other way around... you can bin the original DCV cos the provent's DCV(depression control) not PCV(presure control)[/FONT]

    PCV = Positive Crankcase Ventilation
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  4. 6th July 2017, 09:22 PM #4
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    sierrafery
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    Quote Originally Posted by discorevy View Post
    PCV = Positive Crankcase Ventilation
    Aha...OK, i've seen the term PCV used as pressure control valve and knowing that the name of the original one is depression control valve i made that confusion...sorry
    Discovery Td5 (2000), manual, tuned
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  5. 7th July 2017, 10:25 AM #5
    DiscoMick Guest
    Can I add some questions as I'm very interested in fitting a Provent, but know nothing about them except what I have read.
    1. Does a Puma Defender 2.4 need a large or small Provent? What size fittings for the 2.4?
    2. Is the optional oil dump to the sump a good idea?
    3. If I just leave the original DCV unaltered will having it plus the Provent cause any problems?
    What do you think?
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  6. 24th July 2017, 09:09 PM #6
    DiscoMick Guest
    Discovered today the larger Provent won't fit under the driver's side mudguard.
    Also, I've dumped the idea of disposal to the sump as I was advised it means pulling the sump off to drill and fit a nut inside. Better to just empty it as necessary, I think.
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  7. 25th July 2017, 04:49 AM #7
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    1nando
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    Heres where i installed mine Mick. I have a hose with a tap setup at the bottom. I drain the tiniest amount of oil once every 6 months. Tiny amount!
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  8. 25th July 2017, 05:54 AM #8
    DiscoMick Guest
    Thanks. The workshop wants to put it on the driver's side in my Puma.
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  9. 25th July 2017, 06:02 AM #9
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    1nando
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    The drivers side is a bit cramped...but some have managed to do it
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  10. 25th July 2017, 07:38 PM #10
    DiscoMick Guest
    The workshop manager reckons there is a smaller version that should fit, so I'm leaving it to him to find it.
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