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Thread: 3 cyl Merc 40

  1. #11
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    Has anyone vented the exhaust above water on these motors with any improvements in performance? I've seen some guys drill the mid and sides of mid just above Cav plate. Just trying to get all I can out of this motor and keep it reliable enough to hunt/fish with. Thanks to anyone offering help. This motor will be on a 1648 War Eagle so there won't be any racing for this guy unless its duck hunting spots

  2. #12
    pdt
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    I asked same question about vents
    interesting answers

  3. #13
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    Quote Originally Posted by HGipson View Post
    Has anyone vented the exhaust above water on these motors with any improvements in performance? I've seen some guys drill the mid and sides of mid just above Cav plate. Just trying to get all I can out of this motor and keep it reliable enough to hunt/fish with. Thanks to anyone offering help. This motor will be on a 1648 War Eagle so there won't be any racing for this guy unless its duck hunting spots
    We have drilled one out when we put a bob's lwp on. I think it was a 3/4 in hole with a hole saw. We didn't have any speed gains, just had to re-jet cause it went a little lean. I made a plug with some washers and a bolt to sandwich from both sides of the case that covers the hole so we don't make as much noise going to our duck spot at 4am.

  4. #14
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    "I made a plug with some washers and a bolt to sandwich from both sides of the case that covers the hole so we don't make as much noise going to our duck spot at 4am"

    Brilliant idea, nice simple way to utilise the sound deadening effect of the thru hub, pure ingenuity.
    well done that man, gives me an idea to play with now

  5. #15
    Team Member fs5's Avatar
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    Quote Originally Posted by HGipson View Post
    Has anyone vented the exhaust above water on these motors with any improvements in performance? I've seen some guys drill the mid and sides of mid just above Cav plate. Just trying to get all I can out of this motor and keep it reliable enough to hunt/fish with. Thanks to anyone offering help. This motor will be on a 1648 War Eagle so there won't be any racing for this guy unless its duck hunting spots
    hi mate ,if your buzzing your engine past 6000rpm you will gain 50/100rpm.anything below that you will be hard pressed to tell the diff.
    the more rpms your doin the better it helps.
    theres no better sound then a merc triple with a drilled lower.

  6. #16
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    Quote Originally Posted by fs5 View Post
    theres no better sound then a merc triple with a drilled lower.
    You got that right!

  7. #17
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    Quote Originally Posted by pdt View Post
    Have any of these 70mph plus boats been officially ratified ?
    what means do you use to calculate the speeds of 70 mph ?
    Ratified. Why hell yea,,, several times,,, all the time,, on several occasions.
    Let it all Hang out

  8. #18
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    Quote Originally Posted by omcstratos View Post
    You got that right!
    Sounds like its got a big cam in it.
    Let it all Hang out

  9. #19
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    Quote Originally Posted by omcstratos View Post
    We have drilled one out when we put a bob's lwp on. I think it was a 3/4 in hole with a hole saw. We didn't have any speed gains, just had to re-jet cause it went a little lean. I made a plug with some washers and a bolt to sandwich from both sides of the case that covers the hole so we don't make as much noise going to our duck spot at 4am.

    Attachment 55061
    Did my picture work. I don't know why but I seem to be incompetent at uploading pics...

  10. #20
    pdt
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    How the hell do you hang on to a tiller at 70mph

    what a ride that must be

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