PRV Porting Tips
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  1. #1
    Tadpole
    Join Date
    Feb 2005
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    Colorado Springs, USA
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    17

    Default PRV Porting Tips

    Does anyone have any tips for porting the heads on a PRV? I've got the K-Jet injection with the "twin box" intake manifold. Exhaust side looks pretty straight forward with gasket matching then cleaning up casting humps then polishing. Intake side has me wondering a bit more. Is there any tips on how to match the intake manifold to the heads since the gaskets are O rings? Also the intake ports on the heads look like they have quite a taper into the chamber. How much of the taper needs to remain? Thanks, Rick

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  2. #2
    Demannu-facturing! Demannu's Avatar
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    Dec 2002
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    Melbourne
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    2,528

    Default

    I found these on the net. I'll also take some photos of the porting job I'm doing at the moment on my B280 heads.

    Before and after:
    Attached Thumbnails Attached Thumbnails PRV Porting Tips-imukanava_b28e_vakio.jpg   PRV Porting Tips-imukanava_b28e_viri1.jpg  
    Scotty

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  3. #3
    1000+ Posts PeterT's Avatar
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    Default

    I've never seen a PRV head, but regardless, the majority of flow increases in any head will come from the inlet seat and directly below it. It used to be a black art, but the head place I use now has an automated machine, with tungsten carbide cutters with all the right angles. If your head place is still doing them by hand, find another place.

    In summary, your inlet should have a 3 angle seat, with a 2.5mm 90 degree drop into the bowl, after which it should be blended into the throat.

    The exhaust should have a top cut, a regular 45 deg. seat, , then a constant radius from the bottom of the seat into the bowl.

    I know it's good therapy to get the dremel out and have a fiddle, but the priority has to be guides, then seats.

    '92 205 Mi16
    '90 Mi16x4

  4. #4
    Tadpole
    Join Date
    Feb 2005
    Location
    Colorado Springs, USA
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    17

    Default

    Scott, Where did you find the B28E pics? Thanks, Rick

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