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  1. #1
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    Allison Grand Sport, Merc 150 gearcase mod

    Thought I'd share an update on our Allison with a stock Merc 150. We did an article a little while ago about gearcase design, and how to improve the pointy nosecones commonly seen on aftermarket cone kits. I modified ours, with just a file, and some sanding. I rounded out the tip, and re did the skeg to improve it. We gained 2 MPH, although we are now hitting the rev limiter, so possibly more. But just thought I'd share in case you wanted to try it.

    Article
    https://www.wavetowave.com/home/2019...cation-testing



    Last edited by WavetoWave; 12-02-2019 at 05:22 PM.

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  3. #2
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    Is that grandsport for sale ? What year is it ? How much ?

  4. #3
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    Hitting 77 on the limiter





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  6. #4
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    Quote Originally Posted by pkstv View Post
    Is that grandsport for sale ? What year is it ? How much ?
    It's a 2019. Everything is for sale.

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  8. #5
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    That's a nice rig! I had no idea a 150 fourstroke would run that good, and don't have to worry about blowing the motor up either, probably out last most two strokes.

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  10. #6
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    Quote Originally Posted by robert jordan View Post
    That's a nice rig! I had no idea a 150 fourstroke would run that good, and don't have to worry about blowing the motor up either, probably out last most two strokes.
    Exactly. They are bullet proof, and very economical to run.

  11. #7
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    How much for the gps speedo ? liked my g/ sport also but that's a lot of weight hanging of the back.
    I may be slow but im ahead of you.

  12. #8
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    Quote Originally Posted by racervboat View Post
    How much for the gps speedo ? liked my g/ sport also but that's a lot of weight hanging of the back.
    4 stroke Merc is about the same weight than 2 stroke , is verry light..
    Go boating,be happy!! And wear safety vest please!! And lesson good music...https://www.youtube.com/watch?v=2c5oHITTI8c

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  14. #9
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    Quote Originally Posted by WavetoWave View Post
    Exactly. They are bullet proof, and very economical to run.
    Nice setup my friend! Like you said and last trouble free. New models are slimmer too.
    Last edited by JP Love; 03-19-2019 at 05:53 AM.
    Go boating,be happy!! And wear safety vest please!! And lesson good music...https://www.youtube.com/watch?v=2c5oHITTI8c

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  16. #10
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    Quote Originally Posted by JP Love View Post
    4 stroke Merc is about the same weight than 2 stroke , is verry light..
    455 LBS. Dry weight.

    Copied from
    https://www.anglerschoicemarine.com/...sville-6091041


    • "Weights
    • Dry Weight455 lbs (206 kg)"


    Beautiful rig for sure !

    GLWS
    James H. W2F a V-King... Want 2 Fly a V-King

    Dedicated Site for Hydrostreams >> http://hydrostreamforums.com/
    My Project 1979 V-King restore >> http://hydrostreamforums.com/viewtopic.php?f=9&t=2761

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  18. #11
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    I also done some leading edge work before I etched my Bob s unit. I also believe it helped.
    97 xb2002t-3.4 etech 250 ho

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  20. #12
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    That’s great. I agree with your thoughts in the article and believe you could see 80 by moving up to a 30”. Very cool project.
    1995 Allison Grand Sport
    1998 Mercury Stock 2.5-260 SS

    1990 Velocity 30' - 502's

    Go Daddy Go! Racing

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  22. #13
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    Quote Originally Posted by racervboat View Post
    How much for the gps speedo ? liked my g/ sport also but that's a lot of weight hanging of the back.
    Good question, you'd have to check with one of the retailers on Scream and Fly. I didn't buy it retail, so I can't accurately say.

  23. #14
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    Quote Originally Posted by tnelsmn View Post
    Would like to see a before and after. I plan on adding a bobs cone to my lower this season. Is this a worthwhile mod to all bobs cones? Or more specific to this boat/engine combo? Thanks!
    Ya, it's worthwhile on all pointy cones. We outlined a few reasons why in this article I'll link to. In general, it improves water flow, and reduces drag.

    Details
    https://www.wavetowave.com/home/2019...our-lower-unit

  24. #15
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    Quote Originally Posted by WavetoWave View Post
    Ya, it's worthwhile on all pointy cones. We outlined a few reasons why in this article I'll link to. In general, it improves water flow, and reduces drag.

    Details
    https://www.wavetowave.com/home/2019...our-lower-unit
    Thanks, I found that after posting the question.

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