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  1. #1
    alex29573's Avatar
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    Valvetrain upgrade options

    trying to figure out for my next project what the best option is for valvetrain. Help me out!
    I can only consider options that do not require me to change the valves/pull head off.

    Spring/retainer combos=
    RIVA valvetrain upgrade- $550.00 - 8800rpms
    Supetech spring with retainer - 250.00 - 9000rpms

    I read the supertech combo is more stiff, thats why it can rev a little higher but that is also robbing power at the same time... Anyone have weight comparisons for the retainers on the above kits?

    Kits without springs=
    RIVA retainers that apply more pressure to stock spring - $310.00 - ??rpms
    Les cooke retainers with stock springs and rotax shims - $? - ??rpms
    Les cooke retainers with stock springs -$? - ??rpms

    I believe the 1st and second choices should be similar because its a lighter retainer with a bit more pressure added to a stock spring..?


  2. #2
    Orlando Shark's Avatar
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    Super tech kit has 80 lbs of pressure which you should be able to rev to about 9000 safely and 9200 max. The Riva complete valve train kit has 95 lbs of pressure which you should be able to rev up to 9600 safely but I've seen the kit revved up to a little over 10K.

  3. #3
    alex29573's Avatar
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    So its more like this?? remember stock valves...
    If im planning on running under 9k rpms, supertech would be a better choice because of the less pressure/friction robbing effect? Anyone know the weight difference on riva/supertech retainers?


    Spring/retainer combos=

    RIVA valvetrain upgrade- $550.00 - 9600 to 10000rpms
    Supetech spring with retainer - 250.00 - 9000 to 9200rpms


    Kits without springs=

    RIVA retainers that apply more pressure to stock spring - $310.00 - ??rpms
    Les cooke retainers with stock springs and rotax shims - $? - ??rpms
    Les cooke retainers with stock springs -$? - ??rpms

  4. #4
    Orlando Shark's Avatar
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    I would say:

    St: 9000 stock valves
    92-300 lightened valves

    Riva: 9600 stock valves
    10,000 lightened valves

    Now also take into account that aside from upgrading your valve train when spinning your motor over 8800 you should also consider lighter rods and balancing/knife edging your crankshaft and pistons.

  5. #5
    alex29573's Avatar
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    i've read in other posts that duke and jp1300r have used stock crank/rods up to 9500rpms. Either way thats out of the question for me, Im considering 8xxx rpms

  6. #6
    Orlando Shark's Avatar
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    It's been done but not recommended for a rec ski or if you want your motor to last. If you're going to run under 9k then you should be fine.

  7. #7
    blackvr's Avatar
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    Quote Originally Posted by ImAShark View Post
    Super tech kit has 80 lbs of pressure which you should be able to rev to about 9000 safely and 9200 max. The Riva complete valve train kit has 95 lbs of pressure which you should be able to rev up to 9600 safely but I've seen the kit revved up to a little over 10K.
    Supertech has 95lb seat pressure and ferrea is 90lb just to be clear on that. Both sets work well for over 9k wit stock valves

  8. #8
    Orlando Shark's Avatar
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    Quote Originally Posted by blackvr View Post
    Supertech has 95lb seat pressure and ferrea is 90lb just to be clear on that. Both sets work well for over 9k wit stock valves
    I have the box for a Supertech kit that reads 80lbs on the outside. Unless they make them with different seat pressures?

  9. #9
    Orlando Shark's Avatar
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    Quote Originally Posted by blackvr View Post
    Supertech has 95lb seat pressure and ferrea is 90lb just to be clear on that. Both sets work well for over 9k wit stock valves
    Talking about this same kit no?

    "Supertech Dual Valve Spring and Titanium Retainer Packages for VW VR6 - R32 24v

    Supertech Performance Dual Valve Spring and Titanium Retainer Packages for Volkswagen VR6 - R32 24v
    SPRK-tc25d/vr6 -- 80 lbs seat pressure kit"

  10. #10
    Orlando Shark's Avatar
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    And the Riva/Ferrea/Rude range from 90-95 lbs in seat pressure depending on variables such as material used and gauge used to measure.

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