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  1. Replies
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    Yes, exactly. You could shorten the pipe and...

    Yes, exactly.

    You could shorten the pipe and get it to work at higher rpm, but if you took it off the existing tower and ran it without a pipe it would not make the 60 hp it does now at 5500 rpm. ...
  2. Replies
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    ETEC on Stinger Tower

    No, this is a pipe that is tuned to high power. For optimal power in a single pipe resonance (as this pipe is tuned for) you need a long pipe. If you look up the introduction of the 2 cylinder...
  3. Replies
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    The 2 cylinder ETEC has a massive tower and...

    The 2 cylinder ETEC has a massive tower and inside that tower is a tuned exhaust. The exhaust goes down and wraps back up giving a single cylinder tuned length.

    If you put it on another tower...
  4. Replies
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    I wouldn't sweat it. Yes it's more than you...

    I wouldn't sweat it. Yes it's more than you probably should, but really, it's only .005 on a side and that likely isn't going to be much different than a .030 overbore. As Z noted, keep it from...
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    If you're using the 44xs on any kind of a race...

    If you're using the 44xs on any kind of a race boat, you don't want to use the heavy stock 500 flywheel. The boat won't slow down when you back out of the throttle and that can be dangerous.
    ...
  6. i saw one for sale at the AOMCI meet in...

    i saw one for sale at the AOMCI meet in Constantine Michigan some years ago. I'm thinking it was 2012 or 2013. It looked very much like C5 in that it was in natural wood, but it was pretty rough at...
  7. Replies
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    The biggest problem you're going to have is the...

    The biggest problem you're going to have is the weight of newer motors.

    The 4 cylinder Merc is what has been used in stock and modified outboard for the last 40 years... What you have with a 1990...
  8. Replies
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    Definitely could make a cut on the sides of the...

    Definitely could make a cut on the sides of the rods to reduce weight. Lower is always better. Do some calculations and you'll see that cutting a notch on each side of the rod won't reduce the I...
  9. Replies
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    49,906

    Your biggest issue is going to bucking of the new...

    Your biggest issue is going to bucking of the new rod. The good thing is that the rod is shorter, and bucking failure is a square of the length so you won't require as much of a section as the OE...
  10. Replies
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    49,906

    He mentioned that he's going to tack weld the...

    He mentioned that he's going to tack weld the pin. Tack welding on things with bearings is dangerous. I know they do it with cranks all the time, but one needs to be careful since one can ruin a...
  11. Replies
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    49,906

    1018 is a low carbon steel, the only thing you...

    1018 is a low carbon steel, the only thing you could do with it would be to carburize it anyway, not worth the trouble. I saw the drawn cup and yes that's a good way to do it, that gives you a good...
  12. Replies
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    49,906

    Looking a lot more realistic. I like the...

    Looking a lot more realistic. I like the bearing, that should work a lot better. If you look at the area outside the bearing, it needs to be greater than the area of the bolts. That is because the...
  13. Replies
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    Sticky: Why the 50/50 blend?? Just curious, not familiar...

    Why the 50/50 blend?? Just curious, not familiar with Dominator, what's its claim to fame???
  14. In order to get anything to stick to the existing...

    In order to get anything to stick to the existing polyester you are going to have to use epoxy.

    I've had very good luck with Raka resins. They have different viscosity resins depending on what...
  15. Replies
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    49,906

    While the outer surfaces of the rod are copper...

    While the outer surfaces of the rod are copper plated to mask the carburizing process (so that the rod isn't hard and brittle on the surfaces that are under tension) and only allow the bearing...
  16. Replies
    191
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    49,906

    Careful with welding on the rod cap. If you weld...

    Careful with welding on the rod cap. If you weld on it make sure that it is round when you are done. Welding will distort the cap and also anneal the rod cap (that is a forged part) so it will be...
  17. Replies
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    49,906

    Go with the rolling element brg.. With a half...

    Go with the rolling element brg.. With a half inch pin and not much length you'll seize it in no time without full pressure lubrication (or even with full pressure lubrication). If you keep the...
  18. Replies
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    49,906

    Hmmm Quadruplng the power by FI is probably...

    Hmmm

    Quadruplng the power by FI is probably not the best idea... When I was in high school 40 years ago I read the book "The Sports Car, it's Design and Performance" by a Brit named Colin...
  19. Replies
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    49,906

    Actually the rods and bearing have a good bit of...

    Actually the rods and bearing have a good bit of margin. In modified motors these parts are spun to much higher speeds than a stock motor. When you realize that stress and loads are a speed squared...
  20. Replies
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    49,906

    I'm sure way back when that Mercury would have...

    I'm sure way back when that Mercury would have done something like this if it would have been workable. If there was a way to make this work they wouldn't have made "double" 6's with gearing just...
  21. Replies
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    49,906

    The "forked" rod approach won't work with long...

    The "forked" rod approach won't work with long needels. The angular rotation is different between the two rods and that would cause skidding on the more lightly loaded bearing. To make the forked...
  22. Replies
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    49,906

    Not to throw cold water on the approach, but you...

    Not to throw cold water on the approach, but you need to think seriously about some kind of bearing and a much bigger area for the pin on the master rod. The stress in the pin is high and the...
  23. Replies
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    Sticky: I was looking at rod torque numbers and in my...

    I was looking at rod torque numbers and in my Chilton manual for the 44's it has the same 15 foot pound (180 inch pound) number that you had found previously and used on your last build.

    Jerry...
  24. Replies
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    Sticky: Another thing you might do is call or send a note...

    Another thing you might do is call or send a note to Jerry Wiendant at Trident racing. Jerry is the person who wrote the "44 Secrets" paper, has probably built about a thousand racing motors (or...
  25. Replies
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    Sticky: Did you do a closeup inspection of the broken...

    Did you do a closeup inspection of the broken parts and look for "beach marks" on the rod bolt breakage surfaces? I used to do failure analysis on jet motors and most of the time we could find the...
  26. Replies
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    Sticky: Very late 44's were cracked rods, Not sure what...

    Very late 44's were cracked rods, Not sure what year they went to it, but most of them were the machined rods.
  27. Replies
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    Sticky: That same size bolt on the 44 cubic inch motors...

    That same size bolt on the 44 cubic inch motors is torqued to 18 foot pounds (216 inch pounds) so yes 15 foot pounds is a bit low....

    The merc motors run in the modified classes run pretty high...
  28. Replies
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    Man that thing is built like a tank!!!! With...

    Man that thing is built like a tank!!!!

    With glass on the bottom like that you could have easily reduced the thickness of the bottom sheet by 1/8 of an inch at least.

    Curious as to how much it...
  29. Replies
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    At 35 mm prop shaft depth, you are still pretty...

    At 35 mm prop shaft depth, you are still pretty deep. I'd expect that you would pick up speed by raising the prop, but at some point it will start to slip more and that will be a retrograde step. ...
  30. Replies
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    First of all, I'm pretty sure the "Long Haul" is...

    First of all, I'm pretty sure the "Long Haul" is heavier than the "Wetback", and it is a runabout which isn't going to be as fast as a hydro. A hydro basically flies on a cushion of air and your...
  31. Replies
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    Looks like you are getting it dialed in. A bit...

    Looks like you are getting it dialed in. A bit more tuck and you should be fine. You need to also make sure you are running fast enough, the faster you go the more it will smooth out. What prop...
  32. Replies
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    Tim is of course correct, if the bottom isn't...

    Tim is of course correct, if the bottom isn't flat it will porpoise. In addition you have the engine mounted too low, if the shaft centerline is 35mm below the bottom, it's almost twice as deep as...
  33. Replies
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    Jeff, If you port it a bit lower the exhaust...

    Jeff,

    If you port it a bit lower the exhaust gas won't scrub along the surface and won't transfer as much heat to the cylinder wall in that area. Keeps the oil from burning on the cylinder wall...
  34. Replies
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    Sticky: Yes, you can't use GM LS coils, they have current...

    Yes, you can't use GM LS coils, they have current limiters and also problems with misfire, but there are other coils that could work. I would think the stock Mercury coils would be fine if the box...
  35. Replies
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    Sticky: Once you go to a "one coil per plug" setup that's...

    Once you go to a "one coil per plug" setup that's not an issue anymore. In the old days you would run a 4 cylinder 4 stroke with one coil at 6,000 rpm all day. That's roughly 2000 hz (= revs/second...
  36. How long will carbon reeds last in a 44 Merc??? ...

    How long will carbon reeds last in a 44 Merc??? Also, if the motor is built to APBA stock spec's and revved to say 7200 rpm is there a big advantage in carbon reeds? I realize that with a mod motor...
  37. Replies
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    You probably should have kept the padded V hull,...

    You probably should have kept the padded V hull, they are pretty darn efficient and with the power available easily could have gotten you over 50 MPH. A big flat bottom is fine, but it will pound...
  38. Replies
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    Volume of material = Cost and Overall Size = Cost...

    Volume of material = Cost and Overall Size = Cost

    That is, the more volume in the part the longer it takes on the machine to make it. The overall size also comes into it because the bigger the...
  39. Replies
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    Can you say EXPENSIVE.. I knew you could...

    One word sums up 3D printing of metals.... expensive...

    Making metal parts by 3d printing is very expensive. To make a 75H tower would cost you $10,000. Just because you can doesn't mean it...
  40. Replies
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    Sticky: Where I am they don't let me have anything...

    Where I am they don't let me have anything sharp......
  41. Replies
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    Sticky: Far far less expensive to CNC machine them from a...

    Far far less expensive to CNC machine them from a forged blank than to 3D print them. CNC machining of aluminum is really fast, it cuts like butter with high speed cutting tools.

    Once you...
  42. Replies
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    The regressive pitch (less pitch at the tip) is...

    The regressive pitch (less pitch at the tip) is intended to improve the efficiency of the prop at high speed. The idea behind it is that with a progressive pitch there is a big difference in...
  43. Replies
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    Sticky: No, that link doesn't work anymore. Mercury...

    No, that link doesn't work anymore. Mercury probably deleted that link when they discontinued the oil.

    TCW3 is a rating test. It is run at 6,000 rpm on a water cooled engine. That doesn't mean...
  44. Replies
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    Sticky: The Wiendant link works for me, if it doesn't...

    The Wiendant link works for me, if it doesn't work I'd go to the Wiendant performance technology home page and then go to the racing products drop down menu and then click on the 2 cycle lubricant...
  45. Replies
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    It's just the effect of the float opening and...

    It's just the effect of the float opening and closing. Here's a link to owners manual for that carb.

    http://www.edelbrock.com/automotive_new/misc/tech_center/install/1000/1409_manual.pdf

    The...
  46. Replies
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    2,604

    They don't have to flood to go from rich to lean,...

    They don't have to flood to go from rich to lean, just a change in mixture. BTW what was the change in fuel flow? From what to what? If it wasn't that large (as a percentage) then it is most...
  47. Replies
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    Since its carbs and floats are involved, my guess...

    Since its carbs and floats are involved, my guess is that the pitching of the boat is causing it to run rich when the boat pitched up, and then went lean on the downslide... Could also be the G's...
  48. Replies
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    Sticky: Rejuvenate was discontinued last year. I...

    Rejuvenate was discontinued last year. I mentioned that in post 11 of this thread. Up until now it has still been available at West Marine and a few other places. West had it on clearance and I...
  49. Replies
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    Number 1., get a tach. You don't know what you...

    Number 1., get a tach. You don't know what you have or don't have if you don't know engine speed. Tiny tach's are cheap, and you simply can't start evaluating what you have done without it.
    ...
  50. First of all, .062" (1/16th) is a lot of offset...

    First of all, .062" (1/16th) is a lot of offset from straight. If you are doing this properly you need to make sure you have a machined adaptor that is more like within .020 if you are using splined...
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