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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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    5,087

    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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    5,087

    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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    6,486

    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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    4,430

    Running higher octane will let you run earlier...

    Running higher octane will let you run earlier timing without detonation.

    We run more oil in the mix. More oil tends to reduce octane levels which can lead to detonation. Higher octane fuel...
  6. Replies
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    1,858

    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.
    ...
  7. 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...
  8. 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...
  9. Replies
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    43,230

    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...
  10. Replies
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    43,230

    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...
  11. Replies
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    43,230

    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...
  12. Replies
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    43,230

    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...
  13. Replies
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    43,230

    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...
  14. 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???
  15. 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...
  16. Replies
    191
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    43,230

    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...
  17. Replies
    191
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    43,230

    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...
  18. Replies
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    43,230

    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...
  19. Replies
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    43,230

    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...
  20. Replies
    191
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    43,230

    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...
  21. Replies
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    43,230

    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...
  22. Replies
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    43,230

    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...
  23. Replies
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    43,230

    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...
  24. Replies
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    1,216

    I built the AMT model of the Ala Kart when I was...

    I built the AMT model of the Ala Kart when I was about 10 or 12 years old. One of my favorite model cars.. George did some "different" things, but some of his stuff was timeless..
  25. 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...
  26. Replies
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    459,544

    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...
  27. Replies
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    459,544

    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...
  28. 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.
  29. Replies
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    459,544

    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...
  30. Even if you improved the motor 10% your speed...

    Even if you improved the motor 10% your speed won't improve by 10%...

    Speed of a planing boat is a square root of the power. That is, to improve your speed by 10% you need 21% more power. So...
  31. Replies
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    Work on drag and the speed will come up along...

    Work on drag and the speed will come up along with the rpm's....

    If you are doing just over 60 @ 6500 rpm with this prop you should be able to hit almost 65 with it assuming that you have the...
  32. Replies
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    At these speeds you need to start thinking about...

    At these speeds you need to start thinking about aerodynamic drag. Get a cover for the front half of the boat, canvas or light plywood.. The air spilling off the transom creates a lot of drag. ...
  33. Replies
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    Didn't notice that you were on the other side of...

    Didn't notice that you were on the other side of the world. Ron Thomas did my last lower unit but I understand the other two folks recommended are great also.

    I've been doing some work with a guy...
  34. Replies
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    I wholeheartedly agree with what 25xs said. ...

    I wholeheartedly agree with what 25xs said. Especially if there is some damage or some of the parts are corroded and may make it so that things don't come apart easily.

    These gearboxes weren't...
  35. Replies
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    11,735

    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...
  36. Replies
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    11,735

    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. ...
  37. Replies
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    11,735

    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...
  38. Replies
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    11,735

    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...
  39. Replies
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    11,735

    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...
  40. Replies
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    3,111

    Well, if something sounds too good to be true, it...

    Well, if something sounds too good to be true, it probably is....

    Sure, castings can have voids, but by controlling the process that is minimized and if you get an occasional bad casting the...
  41. Replies
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    3,111

    Forgot to mention that while the people making...

    Forgot to mention that while the people making these machines keep boasting of great material properties, they typically Hot Isostatic Press (HIP) the part to insure that there are no voids in the...
  42. Replies
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    3,111

    Lots and lots of misconceptions as to what you...

    Lots and lots of misconceptions as to what you can do with metal printing....

    First of all the surface quality is such that you are going to have to machine all of the mating surfaces with the...
  43. Roll up 101....

    First of all, every boat is different. Some require more or less of any of the things you are trying to do. It is very dependent on setup, motor depth, hull design, fin size and locations of the...
  44. Replies
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    46,860

    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...
  45. Replies
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    Sticky: Thanks Dave that is exactly what I was trying to...

    Thanks Dave that is exactly what I was trying to understand.

    There's also a difference between cornering fast and cornering easy. Easy might also be digging a bigger hole in the water and may...
  46. Replies
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    Sticky: A couple of quick questions... What are the...

    A couple of quick questions...

    What are the widths of the two pads?? That is, what is the width of the wide pad and the narrow pad???

    And is there a difference in speed or handling that favors...
  47. Replies
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    779,760

    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...
  48. Replies
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    779,760

    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...
  49. 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...
  50. 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...
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