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Thread: Oh how I love my swirl valves....not

  1. #1
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default Oh how I love my swirl valves....not

    After blocking off the EGR and the breath pipe to prevent swirl valve failure, the electrical actuator has failed. The valves are still free to move, held open by the spring, so the bar is still in place of course. But after carrying out the Tech2 test, the actuator has died. Quite un impressed with the quality of that part.

    However, I would not have even known, if not for the light on the dash board. There is not excess smoke low down or loss of performance that I noticed (although of course, mine isn't standard). So as the thing is held in the open (max flow) possition, I am going to give it a dam good ignoring. I have asked EDS if they can try to turn the function off in the map and they are having a look. If they can sort that out, it will stop complaining and it can stay fully open for ever more.

  2. #2
    VIP-Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

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    lol just wish i knew what this did on your engine, it must effect something or it would not be there... what do you suspect will be a side effect of ignoring it?
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



  3. #3
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    It's another emissions gimic, reduces NOX output at low rpm in theory but just reduces the amount of air you can get into the cylinder.

  4. #4
    VIP-Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

    Default

    lol well we do not want to restrict the amount of air going in, the more the merrier..
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



  5. #5
    Regular Member Derek Mc's Avatar
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    I do know the BMW lads can happily run without the swirl flap assy and have blanked them off in their engines, so if it is possible this would be a wonderful little bit of nows for loads of folks

  6. #6
    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

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    The swirl flap helps to mix the fuel/air better at low revs due to low air speed.

    When the engine is reving higher there is no need to aid the mix due to turbulence caused by the extra flow of air.


    It will help emissions at low revs but it will also improve low down power and torque.

  7. #7
    Regular Member vxpenfold's Avatar
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    Vehicle : Vectra Hatchback

    Trim : Life(well it was)

    Engine : Z19DTH

    Year : 2005

    Mileage : 166000

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    that would be true in a petrol but not so much in a diesel, i think it has more to do with the timing of air movement and certain aspects of fluid dynamics in relation to the air rebounding off the back of the inlet valve and helps improve volumetric efficiency over the rev range

  8. #8
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    Vehicle : z

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    I've ran my missus' CDTi 150 for about 30k miles with the 3 swirls stuck open and the bar removed (3rd swirl with actuator still moves freely). Performance is great and had no problems with it. Was considering replacing the manifold, but why?? It runs great, is economical, and only smokes when you really thrash it. I intend to get my money's worth from this manifold, and I see no reason for it to fail now, having done 30k miles like this.

    The car has now done 122k miles (56 registration) and still has the original manifold

  9. #9
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    The theory is that it will improve performance low down and reduce NOX output as I said but in reality, I thing it pulls sooner now than when they worked. They are fully open normally, shortly after 2000rpm, so they would be ully or partly closed for almost all of my normal driving. If they were hurting performance, I would have noticed. EDS are quite happy that they will be fine where they are, as was the VX mechanic, so hopefully, EDS can map it out and put out the fault light. I certainly have no intention of changing them.

  10. #10
    Regular Member Hideous's Avatar
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    Vehicle : Insignia

    Trim : SRi Nav

    Engine : CDTI158

    Year : 2012

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    why do some vectra break down completely with the swirl valve problem, and others seem to be not affected? is it to do with the position the valves get stuck?

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