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  1. #46
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    should not be any play in them threads put a jam nut on there and see if you can snug it up trim the motors the same maybe just buy the ends that swivel ,i have non swivel on mine works ok , some day get the latter

  2. #47
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    Click image for larger version. 

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    Love this pic!

    Thanks Eli, I think I'm going to buy a heim joint for one end.

  3. #48
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    Guys, let me get your opinions on this. If I were to repower my 23 eliminator with new engines, what would you do? I'm currently running twin 300 vmax hpdi's with custom Bob's coned lowers.

    Options:

    1. Twin 250 sho's. Would need custom lowers due to Yamaha not making a 20" LH. I would expect 100-110 mph and great acceleration, plus be able to keep most of my rigging. Unique, as I don't think this has been done before. $39k
    2. Twin 250 or 300xs. Could use them factory stock but have to rerig some stuff. Should accelerate great and hit a solid 110 I think. Proven combo but not anything special, plus I was hoping to go 4 stroke. $36-40k
    3. Single verado 400r. Could use it factory stock. Would expect 100 mph and mediocre acceleration, but would need a lot of new rigging. Cool, the new hot thing. $31k
    3.5. (Edit) Single verado 350. Available in 20" but not with a sport master. Not sure how the 5.44" case would work at speed. Would expect low 90's and mediocre acceleration. Would require new controls and complete new steering. $25k.
    4. Single 250 sho. Could use it stock with little rigging. Would expect 80-85 mph and meh acceleration. Not much of a performance machine. $19k

    Thoughts and opinions? Any options I missed?
    Last edited by engineermike; 07-13-2017 at 11:15 PM.

  4. #49
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    couple of merc 280's sure would sound better lol

  5. #50
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    I don't disagree, but I was looking at new engines...

  6. #51
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    Quote Originally Posted by engineermike View Post
    Guys, let me get your opinions on this. If I were to repower my 23 eliminator with new engines, what would you do? I'm currently running twin 300 vmax hpdi's with custom Bob's coned lowers.

    Options:

    1. Twin 250 sho's. Would need custom lowers due to Yamaha not making a 20" LH. I would expect 100-110 mph and great acceleration, plus be able to keep most of my rigging. Unique, as I don't think this has been done before. $39k
    2. Twin 250 or 300xs. Could use them factory stock but have to rerig some stuff. Should accelerate great and hit a solid 110 I think. Proven combo but not anything special, plus I was hoping to go 4 stroke. $36-40k
    3. Single verado 400r. Could use it factory stock. Would expect 100 mph and mediocre acceleration, but would need a lot of new rigging. Cool, the new hot thing. $31k
    3.5. (Edit) Single verado 350. Available in 20" but not with a sport master. Not sure how the 5.44" case would work at speed. Would expect low 90's and mediocre acceleration. Would require new controls and complete new steering. $25k.
    4. Single 250 sho. Could use it stock with little rigging. Would expect 80-85 mph and meh acceleration. Not much of a performance machine. $19k

    Thoughts and opinions? Any options I missed?
    EngineerMike, I think you're spot on for your twin speed assumptions, but a little optimistic on the singles. Hopefully we see what one runs with a 400R here in the next month or so, mine is at Checkmate getting a new interior and gel repairs. I'm hoping to have it rigged and running in August. I'm expecting 90-95, we shall see. I think high 70's would be all I'd expect with a single 250., 80 would be cooking with a single 250, JMHO.

    To the OP, RikuY, how are things with your boat, now that you've had it a year?
    A problem is only a problem when viewed as a problem...

  7. #52
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    Hydroscreamin, you might be right. My speeds were just guestimates. My original take was that a single engine will suffer a lot of acceleration loss but not that much top speed loss due to weight and drag reductions. However I found one guy that only managed upper 60's with a single 275 (v8). There's another guy claiming 87 from a single 225 and 98 from a single 300, but he did major hull mods to knock something like 800 lb out of it. Now I'm thinking 75 from a single 250 or 95 from a 400r.

  8. #53
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    EngineerMike, I'm in agreement with you. I did run the numbers in the speed calculator, keeping the hull constant the same for each combo, using 265 as the number. This may change twin to single, but keeping it the same for calc purposes allows only the HP change to be seen.

    If you keep a boat weight of 3200, you can see with 520 HP (2-260's like Eli's combo) nets 107, the 250 nets 74, and the 400 nets 94. Note also in the link it is referring to UNcorrected HP, so the LIE FACTOR on a dyno will skew results. It's a ballpark tool for me, I wouldn't get caught up in it trying to predict to the last MPH, but it does help add some reality to how much power it'll take a combo to pick up 10 MPH if you have a good baseline.

    http://www.go-fast.com/boat_speed_predictions.htm

    My hull weighed 1540 before I started on it with tanks, and weighed 1540 when I was done with it without tanks, but I added a 3rd layer to the transom, more layers of glass in the sponsons to replace rotten core, and crossbracing every two feet to stiffen the whole boat up. If you want to read a novel and see the build thread, here it is: http://www.riverdavesplace.com/forum...mod-23-Daytona

    So the bare hull with tanks is 1620, I'm predicting 400 lbs for interior and stereo, 80 lbs for batteries, 680 lb engine (ready to run: steering cyl, 8L oil in sump), 50 lbs for Stainless Marine Gorilla jackplate, 25 lbs for power steering and jack plate pump, 120 lbs for fuel (20 gal), plus 200 lbs for driver equals 3175.

    A twin 300 XS can add 330 lbs for the difference in engines, 40+ lbs for twin 3 gal oil tanks with oil, another setback bracket (40-50 lbs), and steering ( 10 lbs per engine, or 20 lbs), which is an additional 430 lbs on the conservative side.

    Have you weighed your boat yet with the twin Yammi's? It would be good knowledge to have. I've done the "drop the boat and weigh truck and trailer separate" method, and just weigh the boat on scales, they come out the same.
    A problem is only a problem when viewed as a problem...

  9. #54
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    The more I think about it, the more it looks like a repower with a 400r or a pair of 250xs makes the most sense, or just leave the 300's. I just have trouble getting excited about the pair of xs motors. They're 2 stroke and been done many times. Based on forum reading, the 400r needs a center pod to work right on a cat. The skater guys are whining about difficulty setting up a single with no pod. If there were a perfect hull for a single 400r, the 23 eliminator might be it. I know at least one 22' talon and 22' liberator have been done (both have center pods) with speeds of 110 - "115MPH with more speed on tap." They're also claiming 110 with a single 300xs and I'm certain the elim 23 won't do that.
    Last edited by engineermike; 07-16-2017 at 07:39 PM.

  10. #55
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    I agree that if a 400 single is going to work on a midsize cat then you have the perfect one for it. I would wait to see how hydros performs. I sent you a pm on your 300s before I saw the pictures on this thread.

    Joe

  11. #56
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    Bad Ass....looks great !

  12. #57
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    I've sadly hurt an engine, so I decided to try and sell the twins and rigging and convert to a single. In case anyone knows anyone looking for a cheap route to 660 hp worth of twin outboard power plus quality rigging, here is a link:

    http://www.screamandfly.com/showthre...c-stage-2-kits

  13. #58
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    Hydroskreamin, did you get your boat going with the 400r? Do you have any pics of it?

  14. #59
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    Quote Originally Posted by engineermike View Post
    Hydroskreamin, did you get your boat going with the 400r? Do you have any pics of it?
    I'm assuming you are asking for pictures of it rigged, correct?

    I have not gotten it rigged yet as it has been in interior purgatory since June. I was supposed to pick it up tomorrow and that got pushed off. Hopefully, I can get it running before the water gets hard here. I probably can't get to it for a month now due to work commitments, but I'm going to do everything in my power once I actually have it in my garage to finish rigging it and run a few props across it before the water gets hard.

    If interested, I do have a pic with the jackplate and engine bolted to the transom when I drilled the new transom.
    A problem is only a problem when viewed as a problem...

  15. #60
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    Yes, post it!

    On a side note, how fast is a 23' eliminator with twin 200's?

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