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  1. #16
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    I run twin s3000 on a waterski race boat over here. port runs lh and the starboard runs rh and don't have an issue at all. have run them bone stock, and modded, tight heads and standed with 225pm head gaskets etc no issues. pull 9200rpms in a race. will try in the next few weeks to run on dyno, will run one both ways and post the graft when done.

  2. Thanks Markus thanked for this post
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  3. #17
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    That would be awesome info thanks
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  4. #18
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    Quote Originally Posted by speedinstream View Post
    I was told by a very reputable f1/champ racer that there is a difference in the pistons in the two motors because of rotation
    The drag piston is the S3000 piston wearing a piston skirt.

    If they can go either way, they are called bi pistons.
    Markus' Performance Boating Links:
    www.toastedmarshmallow.com/performance

  5. #19
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    Lol ya would be politically incorrect to call them different
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  6. #20
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    Originally merc made the single ring race piston for lhr and the 2 ring for rhr. I believe the wrist pin offset and profile of the piston is difference.
    Popey

  7. #21
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    Ted at Speedmaster told me i have to check the lenght of my new rods because they could be out of spec from mercury and could throw my squish mesurement off. lmao.. must be some of them Left hand rods he was tryina sell me ..

  8. #22
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    Quote Originally Posted by Steve Pope View Post
    Originally merc made the single ring race piston for lhr and the 2 ring for rhr. I believe the wrist pin offset and profile of the piston is difference.
    Yes but now we have single ring drag motors
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  9. #23
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    Originally the drag was a 2 ring? Is the piston part number for the s3000 and the drag now the same?
    Popey

  10. #24
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    Quote Originally Posted by Steve Pope View Post
    Originally the drag was a 2 ring? Is the piston part number for the s3000 and the drag now the same?
    thats what we trying to find out sombody post part numbers
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  11. #25
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    There was one and two ring drags.

  12. #26
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    I ran the s3000/F1 pistons for 4-5 yrs with no issue turned over 10,700. There may a difference that I am unaware of but they worked fine for me.

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  14. #27
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    Well put it this way the bros at diamond marine have sold me 12 pistons for two motors I have that one runs as a genuine s3000 so spinning LH and the other RH
    and they new that they run on the same boat side by side and we have talked a lot about it and sold me pistons that are the same for both motors. 827352a18 and 827353a18 with no issues

  15. #28
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    Those are dual ring correct?
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  16. #29
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    Quote Originally Posted by R.grover View Post
    Well put it this way the bros at diamond marine have sold me 12 pistons for two motors I have that one runs as a genuine s3000 so spinning LH and the other RH
    and they new that they run on the same boat side by side and we have talked a lot about it and sold me pistons that are the same for both motors. 827352a18 and 827353a18 with no issues
    It's been a long time but this is how I remember it. Same part number and same piston for S3000 and Drag. First two ring then single ring. Never saw separate part numbers for S3000 and drag pistons.

    Engines were the same other then left hand rotation and right hand rotation. The rotation change was done by different, flywheel and starter. Left hand engines typically made a few more horsepower on the dyno.

  17. #30
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    I wonder if left hand engines run a little leaner on the port side like a standard rotation motor.

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