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Thread: Halved v-6 three cylinder

  1. #21
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    Default phots i think

    See if this workedName:  100_1848.jpg
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    Likes slowJEEP liked this post

  2. #22
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    Default more phots

    2.4 and 2.5 the most fun you can have with just 3 pistons.
    Always use the port bank when running left handed. It makes more power.
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  3. #23
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    Default

    port bank, STB exhaust like 31M omc

  4. #24
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    Default 1/2 v-6

    Quote Originally Posted by Powerabout View Post
    port bank, STB exhaust like 31M omc
    Port bank of cylinders and Port side of exhaust. Shortest piston to pipe length.

  5. #25
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    Quote Originally Posted by Mike Wienandt View Post
    Port bank of cylinders and Port side of exhaust. Shortest piston to pipe length.
    meaning the low bank side, 2,4,6?
    OMC always said it was about the thrust side of the piston v exhaust port and crankcase dilution?
    Hence the m31 block was reversed from the stock 49ci

  6. #26
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    I know if you run starboard bank, 1.3.5 the engine will not rev as high. We always figure it was piston face to pipe length.
    We always race 2,4,6. low bank, port side
    Thanks Powerabout, slowJEEP thanked for this post

  7. #27
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    Thanks for the pictures Mike. I was thinking about running single barrel carbs, I guess blocking off the unused side is good enough.

  8. #28
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    Quote Originally Posted by slowJEEP View Post
    Thanks for the pictures Mike. I was thinking about running single barrel carbs, I guess blocking off the unused side is good enough.
    When I raced SST70, it was to be 2.4 stock block. I filled the odd side reed block with epoxy so no air flow. Then just put a drop of epoxy in the carb inlet needle seat to not allow fuel to that side of the carb. That's all it takes there to make it work.

    In the Mod 110 class I used the mod 2.5, and big carb. However blocked off the other venturi. I never saw anyone make both venturis work on a half of engine. Velocity not correct for the tubes in the carb to run clean. Not to say it can't be done, but you have a lot of testing ahead of you. I thought about running the small carbs but never did.

    Some of our goals was quick beach start so larger carbs make that worse. Also was best off the dock with the small reed blocks. Big reed blocks were faster but chose to get to the first turn first.
    Thanks slowJEEP thanked for this post

  9. #29
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    so what kinda HP would these motors make ?

  10. #30
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    Quote Originally Posted by MErkMAniak View Post
    so what kinda HP would these motors make ?
    2.4L stock block with any tuner and tighter head is 125-6 hp
    2.5L Mod is 160 hp big time on the fun meter

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