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  1. Replies
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    Sticky: I was interested in racing, but after finding out...

    I was interested in racing, but after finding out what todays stuff is about I decided to just collect and run them sensibly for personal enjoyment...but what I learned about racing outboards and set...
  2. The reason that stock/mod outboard racing...

    The reason that stock/mod outboard racing (particularly the so-called B stock) is virtually gone as it deserves to be, is because everybody doing it is running obscure and antique engines that are...
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    Your weight is just right at maximum for...

    Your weight is just right at maximum for competition. These engines are good for drivers up to 160 lbs. You are at 165 (75kg) so that is o.k....
    Someone said 100lb boats and 100lb drivers but that...
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    These are awesome engines in a race set-up. They...

    These are awesome engines in a race set-up. They are suitable for drivers up to 160lbs in competition. These are a 50-55+ mph ride. If you are between 160-200 lbs in body weight though, it is still a...
  5. I laughed so hard at this clip, my eyes are...

    I laughed so hard at this clip, my eyes are watering!!
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    Excellent! Glenno, I would like to say that your...

    Excellent! Glenno, I would like to say that your project isn't just a home-made propeller....it is a fine and precise work of art that will prove successful. It looks perfect!
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    The best way to balance your new prop is this: ...

    The best way to balance your new prop is this:

    1- Make sure your threaded rod or test shaft is straight and true by laying it on a flat surface and rolling it to see if it has any wobble.

    2-...
  8. Replies
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    16,694

    The wonderful DREMEL tool makes everything like...

    The wonderful DREMEL tool makes everything like this easy. That's what is needed here for precise work in corners. It will take time though.
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    Here is a feasible suggestion for rod design........

    Here is a feasible suggestion for rod design.....

    Just machine a gully through one rod end. Then narrow down the other rod end to fit and ride in between the other rod's gully or valley, whatever...
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    Forget the turbo......you don't need it. Having...

    Forget the turbo......you don't need it. Having years of experience around 18 wheelers, and having owned and fixed up a classic International 9670, I can tell you that the venerable Detroit 6v and 8v...
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    I've tried it before, and didn't see or detect...

    I've tried it before, and didn't see or detect any negative effects. But I mostly use my Pennzoil outboard oil though.

    PWC engines are very high performance compared to typical outboard engines....
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    It depends on how efficient the motor was to...

    It depends on how efficient the motor was to start with......but ultimately, I would say a bit richer. It will be more powerful than a closed restricted style exhaust, but more feul will be evacuated...
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    about "high compression heads", between two and...

    about "high compression heads", between two and four cycle engines......

    I see a lot of people emphasizing on making the cylinder [combustion chamber(s)] tighter.... Well, on a two cycle engine,...
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    I have a Yamato-80 racing engine. All eight of...

    I have a Yamato-80 racing engine. All eight of its reed petals are raised about 1/16" of an inch off the blocks. A long while back, I e-mailed Rick Montoya about this and he said that it was normal...
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    If the engine starts up and performs adequately,...

    If the engine starts up and performs adequately, then they are O.K....

    What you have are "racing reeds". Any good race/high output engine (with reed valves) are going to be raised a bit. The...
  16. Replies
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    Sticky: If the ignition was weak under compression, it...

    If the ignition was weak under compression, it wouldn't start as easily as it does and/or idle so good...but jumping fire, and shorting at higher RPMs has been my experience though, until I sealed...
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    Sticky: Turn the fuel divider rail upside down so the...

    Turn the fuel divider rail upside down so the initial fuel feed from tank will come in from the top down to the pumps, instead of bottom up. That might help guarantee equal distribution to pumps....
  18. Replies
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    Sticky: When I needed one of those thin-wall block nuts,...

    When I needed one of those thin-wall block nuts, I would just grind the outer hex sides of the correct thread size nut till it would fit in the wrench. Use a micrometer to check the amount of removal...
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    Sticky: Maybe high speed wasn't what broke it. This...

    Maybe high speed wasn't what broke it. This engine he built is something different and there is no telling what kind of power and load that's happening with the rotating assembly. It could be packing...
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    Sticky: Bolts in general have a standard torque rating...

    Bolts in general have a standard torque rating based on sizes and grade as already tested. There is info that can be found on the net. But if you go beyond the rating of a particular grade bolt, it...
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    533,436

    Sticky: It can definitely be fixed, but you have to make...

    It can definitely be fixed, but you have to make some rods that are capable of handling the output of this design (stress tested at engine temperature), or find some that are. Those factory Merc...
  22. Hi friends! Well, I went for a long boat ride...

    Hi friends! Well, I went for a long boat ride today and you wont believe what happened! One of the cylinders came loose! It did not cause any harm...but something I want to emphasize is that if...
  23. Thanks for this info! My Vacturi carb is the...

    Thanks for this info! My Vacturi carb is the exact one that came with the early PR-50 (Johnson "16" racer). It does have about a 1.75" venturi. Interestingly, it is working very well on my PO-37 or...
  24. UPDATE!! I took it out for a run today!! Here's...

    UPDATE!! I took it out for a run today!! Here's the tale of the tape......

    It started right up, by the second pull...I had to lean it out a bit to get it smooth, but it ran pretty well. It does...
  25. It definitely would seem a bit much carb for...

    It definitely would seem a bit much carb for practical use by looking at it. I haven't had a chance to try it out yet though. I found out by searching around that this carb is a Vacturi (36D10)...
  26. Thanks Tim! I appreciate this info. I haven't...

    Thanks Tim! I appreciate this info. I haven't tried to crank it up yet, but I hope it is a stock (gasoline) version of this carb. If it isn't, I might not get it to run so good. Mine has the old 90...
  27. Anybody know about Vacturi-500 carburator adjustments?

    I have recently finished a complete mechanical restoration on a nice complete PO-15 (22 HP) Johnson....the big iron twin beast! I acquired it and a little 1956 Johnson 7.5 for later restoration from...
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    Looking at that plug (mighty clean looking) and...

    Looking at that plug (mighty clean looking) and the patterns on the pistons (not the carbon patterns, but the clean metal patterns that line up with the ports) I would seriously check my oil...
  29. Replies
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    If the plugs are real clean after an hour or so...

    If the plugs are real clean after an hour or so running, could be moisture (water) in fuel or from somewhere within.
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    Ford had a great 302 for many years. But the GM...

    Ford had a great 302 for many years. But the GM 5.0 liter that was available in the late seventies and in the 80s was a (305 v-8). GM did have a 302, but that was a special competition/performance...
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    The 3/4 ton vans by GM were actually "heavy half...

    The 3/4 ton vans by GM were actually "heavy half tons". Rather than the heavier 14 bolt rears with the full floating axles like the ones on 3/4 ton pick-ups, many of the 3/4 ton vans had those five...
  32. Well, after reading that one cylinder has lower...

    Well, after reading that one cylinder has lower compression by design and remembering this older reply here of mine, looks like I got the closest if not exact guess! But I figured it was something to...
  33. Well, the bigger carb can be put on to start...

    Well, the bigger carb can be put on to start anyway, but if the engine is loaded on the heavy side (not able to reach max RPM with current load), then a bigger carb likely wont help and can make...
  34. It depends on the displacement of each 30hp motor...

    It depends on the displacement of each 30hp motor compared to yours. If either is the same, it should work. However, from what I am reading, it sounds like you really need a lower pitch prop more...
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    Three possible scenarios........#1-the gap...

    Three possible scenarios........#1-the gap between magnet and coil-heel is too wide on the new wheel......#2-the magnet might be placed differently because of design change from another...
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    That's what I use, just regular Pennzoil marine....

    That's what I use, just regular Pennzoil marine. The synthetic is great, but I have always had good running with the regular on my older outboards for fishing. My fishing motors are: a WM7 "Super-10"...
  37. Replies
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    You can get Pennzoil marine 2-cycle oil at...

    You can get Pennzoil marine 2-cycle oil at Advance Auto Parts and also Walmart both at a reasonable price. If you have an O-Rielly Auto Parts store near, they sell Lucas high performance two cycle...
  38. That is what I would expect! But perhaps there is...

    That is what I would expect! But perhaps there is a difference in design from one cylinder to the other that warrants such a change?......ex.( one of the crankcases powers a fuel pump or has an oil...
  39. Replies
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    Sticky: This reminds me of some of my ideas about setting...

    This reminds me of some of my ideas about setting up a personal practice coarse. One thing that could be done pretty cheap is to buy 4'x8' sheets of styrofoam, cut them into triangle pieces, get some...
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    If you will need to cut a new keyway after boring...

    If you will need to cut a new keyway after boring the hub to larger I.D, that can be something to question as far as possible stress cracking at that point. Factors to consider are.....

    - load:...
  41. The military has equipment rated their way...

    The military has equipment rated their way (traditional instead of general consumer specs). It is the same output as the 35 or later 30 hp. The Mars is a stealthy outboard that has a special sound...
  42. Replies
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    [QUOTE=Bill Van Steenwyk;145592] Yes,...

    Yes, pro-race motors have two piece shaft assembly's. The Yamato stock outboards do to. Many of the early OMC opposed iron racers were also made this way. But what is different is that these motors...
  43. Replies
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    Coupling shafts can be tricky. They need...

    Coupling shafts can be tricky. They need "perfect" alignment and strength along with balance, otherwise such a fabrication can be destructive to the gear-case and power-head and dangerous.

    Your...
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    This reminds me of the 3hp class that I think the...

    This reminds me of the 3hp class that I think the AOMC did. I found out about it and, just for fun, built a 12ft plywood jon boat and fixed up a little 3.5 Chrysler. Once I climbed to the middle of...
  45. What you'll need is for the inside diameter of...

    What you'll need is for the inside diameter of the fitting to be as close as possible to the inside diameter of the cooling tube. A 1/4 NPT fitting is about right I believe. You might want to go all...
  46. Replies
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    6 to 8hp motors? Hmm....It would be hilarious if...

    6 to 8hp motors? Hmm....It would be hilarious if someone showed up with a Elto 6hp midget-racer, Martin high-speed 60, or a 7.9hp Champion 4LX hotrod!!
  47. That merc 4cyl is a really great looking engine!...

    That merc 4cyl is a really great looking engine! Thanks Aeroliner for the info on timing....

    I guess it would have been a good idea to have used a timing light on my old ignition first as some...
  48. question on ignition timing: CDI vs BREAKER POINTS

    My question is... does a CDI ignition require a bit less advancement (simply regarding the position of the mag plate) than it would with the old points type?

    The reason I ask, is that a while...
  49. Thread: carbs

    by champ20B
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    Not to change the subject, but I was wondering if...

    Not to change the subject, but I was wondering if these alternate twin konig and "Z" quincy models were what was used in "B-restricted" later on till the 1980s? I know that a modified alky Yamato 80...
  50. Thread: carbs

    by champ20B
    Replies
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    5,657

    If you mean the "opposed cylinder" pro-outboards,...

    If you mean the "opposed cylinder" pro-outboards, that is reverting back to the one carb per cylinder scenario (even if you have only one carb feeding both cylinders). An opposed twin is like a...
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