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  1. #1

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    For anyone debating RIVA pistons, have a look

    I finally pulled down the Turbo GTI engine. I built it just before World Finals in late September of 2009. I had the very first set of Riva's new pistons, and I was the test mule. The photos you may have seen posted in the release were actually of this motor.

    67 hours of hard times later, I pulled it down for inspection and freshen up before the start of the 2010 season, and this is what I find.... I wasted my time.. it is spotless inside. I set these up at .003 piston to wall, and I dropped them in, I did not modify the piston in any way. Also note this was a stock rod engine running 29psi at over 9000rpm, with boost overshoot off corners to 9500rpm regularly. See sample data from last saturday.

    I just thought I would post this for all to see that this is a sound product. There is zero scuffing on the skirts, the cylinder walls are spotless. Most impressive is the lack of blow down over the crown. It is common to see blow down to the top of the first ring. With Seadoo Pistons it is even common down to the second ring, but that is the top rings fault. These have ZERO.. And every second of run time on this thing is full tilt, there is no idling time or no wake zones at MKP.. it is flat out.

    Cylinder pressures were 155psi right across with my guage and my setup form start to finish. I think I may go back together with the 9.5's

    Keep the air charge and cooling temps inline, no detonation, and Lambda under 12.0 and these motors are strong. Have a look at that rod bearing too.

    Have fun..

    Louis
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  2. #2
    I like Boobs. wetwolf's Avatar
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    Pistons look great, rod bearings should get replaced tho. a little wear on the high side.

  3. #3
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Riva Pistons

    Thanks Louis

    I have just dropped my in and are looking forward to getting back on the water. That gives me alot of confidence in there reliability.

    Mark

  4. #4
    just curious. did you check the piston to wall clearance when you took it apart? just wondering how much they loosened up after 67 hrs.

  5. #5

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    I have not yet measured them, only a visual inspection. I will upon reassembly. The only real notable wear so far is the piston pin bushings, but I am not reusing these connecting rods.

    I will post the answer to your question when I measure tomorrow.

  6. #6
    Ride Hard! aha's Avatar
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    Very nice Louis!

  7. #7
    West Texas RXP skoepp's Avatar
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    Freakin sweet..
    Those look like they just went in.
    My motor is being rebuilt with rivas right now.
    the engine shop that speced all parts and honed my block rants and raves about how bad ass the riva pistons are designed.
    They mainly deal with Big block race motors so they see some pretty sweet stuff.

  8. #8
    Golden Jet red fox's Avatar
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    i done rebuild my engine with Riva over size Piston

    its work great with 2Rude

    The Piston Pressure 140Psi - 140Psi - 140Psi


    Riva make a good stuff always

  9. #9
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by red fox View Post
    i done rebuild my engine with Riva over size Piston

    its work great with 2Rude

    The Piston Pressure 140Psi - 140Psi - 140Psi


    Riva make a good stuff always
    Sorry to get off topic but:
    What boost and rpm you running???
    Are you running a fuel regulator?

    Nice setup.

  10. #10
    Golden Jet red fox's Avatar
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    Quote Originally Posted by skoepp View Post
    Sorry to get off topic but:
    What boost and rpm you running???
    Are you running a fuel regulator?

    Nice setup.
    15 psi ( MiniRude )
    Riva Ecu 8600 RPM
    Rude Fuel Regulator -63 psi + ( 50 BOSCH Fuel injector )
    Riva Water Box .........etc

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