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Thread: Evinrude 31.8ci Mod Advice

  1. #31
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    I agree with you, before we buy a prop we are going to get a jack plate and maybe a trim and tilt, we want to get the best out of this prop before switching props if we hit 6200rpms then that's are limit to switch props because that's when our rev limiter kicks in. I don't really know what else to do to the engine besides the tuner idea I said, cleaning up the lower unit, and timing to maybe 33 degrees. any more ideas??

  2. #32
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    we were surprised with the 3mph gain and quite happy. we are always keeping a good eye on our water pressure don't want to over heat the motor, and I agree with you maybe a little more and we will be right on our 40mph but will probably hit the rev limiter before that.
    "All this is proof that props & set up are the things to do & afterwards motor work can be icing on cake." very true

  3. #33
    Team Member JohnsonM50's Avatar
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    Cleavers tend to run very efficient, in the 90% & better neighborhood, still there's no garantee one will do better than what you have. best to test, only way to know.

  4. #34
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    Hey guys sorry it took so long to get back. Just tested the motor with a stock tuner and ran 37.5mph at 6140RPMs not much difference but with the out side air temp only getting warmer the test held up very well. Making a Hydraulic jack plat this week so will have more feed back next week. Any more advice would be great. Any ideas to make the aluminum boat slide over the water smother?

  5. #35
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    Quote Originally Posted by Emustard View Post
    Hey guys sorry it took so long to get back. Just tested the motor with a stock tuner and ran 37.5mph at 6140RPMs not much difference but with the out side air temp only getting warmer the test held up very well. Making a Hydraulic jack plat this week so will have more feed back next week. Any more advice would be great. Any ideas to make the aluminum boat slide over the water smother?
    Sliding over the water smoother.. that is the question that goes way back. We generally sand cross direction with 400 grit on the flat kneeldown race hulls. Thats thought to be better than shiney smooth. If you want to go radical, a coat of west & graphite but it might do nothing for all the effort. The most succesful method besides lotsa horsepower is airing it out, so the jackplate?? Hope it works out.

  6. #36
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    hopefully we can finish it this week so we can test it on the weekend, just have a couple of more things to do before we mount it and wire it.
    Attachment 54296Attachment 54297Attachment 54298Attachment 54299Attachment 54300Attachment 54301Attachment 54302

  7. #37
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    Quote Originally Posted by Emustard View Post
    hopefully we can finish it this week so we can test it on the weekend, just have a couple of more things to do before we mount it and wire it.
    Attachment 54296Attachment 54297Attachment 54298Attachment 54299Attachment 54300Attachment 54301Attachment 54302
    u can still rise the motor some more and still be safe on your water. we use to river race down here and we ran 25s and 20s on 10ft aluminum boats and we would put the prop shaft about 1inch under the bottom of the boat,,, a cleaver prop are a chopper prop, works the best at this height, if your stock prop is sliping at this height puts some cup on the end of the blades and it should stop. good luck.
    Let it all Hang out

  8. #38
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    I agree to raise it all you can with the prop you have been testing, when maxed out a determination on a surfaceable prop can be better made. 2 things happen in general, the motor is free to spin more R's & the boat is hopefully aired out a little more.

  9. #39
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    We will definitely try raising the motor a little more but im sure we are pushing the limit with that prop right now so your probably right we will start slipping. What kinds of speed were you seeing with with the 25s on 10ft aluminums?

  10. #40
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    Quote Originally Posted by Emustard View Post
    We will definitely try raising the motor a little more but im sure we are pushing the limit with that prop right now so your probably right we will start slipping. What kinds of speed were you seeing with with the 25s on 10ft aluminums?
    anywhere from 52 to 55 with the ole 20 mercury,, i still have my motor, we all had stacks on them, one guy had a ole 25 johnson,same as the 35 and he put the stacks(horn) on it and it would run 60, we couldnt do nothin with him,, it could fly. lol but we had them all jack high with cleave props on them.
    Let it all Hang out

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