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  1. #1

    unported speed #'s

    finally after being one year riding almost stock decided to do some work on it. here are my numbers.

    67.7 stock

    70.5 d-plate, 800 grate, unmodded riva plate, pump seal kit

    76.5 the above plus reinforced pump,efi, open throttle bodies, solas 14/20 piched, modded riva plate, vf3 reeds, oem milled head 160 psi 40,000 squish, @7140 ,87 degrees, 90 percent humidity

    still have to seal all the bolts underneath, install leos wedge, keyway

    thanx to everyone in the forum for their help


  2. #2
    OLD # 7 IEGPR's Avatar
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    Who opened your TBs and what did you do to the efi

  3. #3
    i just removed oem black box

  4. #4
    OLD # 7 IEGPR's Avatar
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    aww, OK,

  5. #5
    dlamazing's Avatar
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    Quote Originally Posted by GPR View Post
    finally after being one year riding almost stock decided to do some work on it. here are my numbers.

    67.7 stock

    70.5 d-plate, 800 grate, unmodded riva plate, pump seal kit

    76.5 the above plus reinforced pump,efi, open throttle bodies, solas 14/20 piched, modded riva plate, vf3 reeds, oem milled head 160 psi 40,000 squish, @7140 ,87 degrees, 90 percent humidity

    still have to seal all the bolts underneath, install leos wedge, keyway

    thanx to everyone in the forum for their help
    sounds like the speedo miles not gps,gps is a heart breaker!

  6. #6
    Duke's Avatar
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    GPRGASM's 05 went 76+ last year here in FL on the St Johns.

    Unported, VF3s, milled head, pitched DF, beat up R&D rideplate, EFI controller and 1200 grate. GPS of course.

  7. #7
    (oem milled head 160 psi 40,000 squish,)

    If you shave off all of the lip on the stock head, which is as far as you can go without getting into the squish band, you only have 145 psi on an unported motor, less on ported, and .055-.058 squish.
    The only way you can get .040 squish is to deck the top of the cylinders .020 with the head being cut also.
    Cutting all the lip off a riva head, without decking the cylinders still gives you .055-.058 squish, but compression is a little higher, and those numbers are with a one layer head gasket, add .009 to squish for standard double layer gasket.

  8. #8
    L Carlson's Avatar
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    Quote Originally Posted by rossnemo View Post
    (oem milled head 160 psi 40,000 squish,)

    If you shave off all of the lip on the stock head, which is as far as you can go without getting into the squish band, you only have 145 psi on an unported motor, less on ported, and .055-.058 squish.
    The only way you can get .040 squish is to deck the top of the cylinders .020 with the head being cut also.
    Cutting all the lip off a riva head, without decking the cylinders still gives you .055-.058 squish, but compression is a little higher, and those numbers are with a one layer head gasket, add .009 to squish for standard double layer gasket.
    Great post Ross! and very true! All you fast guys want to see your numbers drop? Roll down my way into the Sub- Tropics. From Tampa to my area is a 2 mile drop! Lee

  9. #9
    Moderated
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    autosport ran 77+ MPH on his unported EFI with mik72e piloting it.

    thats the best i know of locally.

  10. #10

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    My '06 1300 unported went 77.8 on radar at 2006 mudbug in the heat.

    GPR- Great speeds. Add the keyway and you should be around 7200rpms and 77mph+ and faster in the cooler air.

    My Exact setup-
    800 grate
    14/22 dynafly at 7200rpm
    EFI
    d-plate
    VF3 reeds
    open throttle boddies
    3 degree key
    Riva heads at 160lbs and about .040 squish
    1300 Modded Riva Plate at .950" angle
    Stock tabs shimmed .110"

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