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  1. I'm sure there are others here that would be...

    I'm sure there are others here that would be better qualified to answer that one on megaphones. From dyno experience I have found that with expansion chambers , the convergent cone, at the far end...
  2. Champ, I've never tried insulating pipes on an...

    Champ, I've never tried insulating pipes on an outboard only on the drag snowmobile. The pipe temp would be a variable that would be different from dyno to real world though. First off there is no...
  3. I've spent several years drag racing snowmobiles...

    I've spent several years drag racing snowmobiles where a dyno was almost a must for finding the very small range that the horsepower peaked. This range on our very narrow power band of a hundred or...
  4. Bill and Mike, you are both using sensible logic...

    Bill and Mike, you are both using sensible logic that I have also found to be true in pretty much all other motor performance situations. But this case is different, somehow everyone seems to be...
  5. Mercs and megaphones--thinking the unthinkable?

    There is something that I've never been able to figure out and never heard a good explanation either. Here's the deal, I own a Stuska water brake dynamometer (130 hp max, 14,000 rpm) and have dyno'ed...
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    I had a few emergency jobs that pulled me away...

    I had a few emergency jobs that pulled me away from the project, but as soon as warmer weather approaches I'll jump back in. I'm also working on a 84 cu. in. 3 cyl 90 hp Merc for my 14' 6" Andrews...
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    Here's a few more pics of the latest progress....

    Here's a few more pics of the latest progress. The electric starter mounting ear is almost finished, the alum block wasn't quite big enough for both starter bolts and will need a bolt on piece for...
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    Here is the pyramid reed mount plate with mounted...

    Here is the pyramid reed mount plate with mounted reed cages. I got a little carried away when I was programming the pockets for the cages and went the extra step of programming individual pockets...
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    Chris and anyone else that the link won't work...

    Chris and anyone else that the link won't work for; go to youtube and search for "dixon edm" and "cnc reed".
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    5173751738This is how I went about cutting the...

    5173751738This is how I went about cutting the front of the crankcase, reed cage pockets. The pic is the screen of the CNC Hurco that shows the program that was used to cut the four cavities. It's...
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    The pictures here show how I dealt with cutting...

    The pictures here show how I dealt with cutting the rod clearance into the new crankcase. I always assumed that the rod clearance was a true arc, but by cutting a scrap crankcase, I easily saw the...
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    Jeff, the problem with short lived reeds may be...

    Jeff, the problem with short lived reeds may be due to the original reed location being just too close to the crank throws. I just never could bring myself to close the reeds stops down to insure...
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    The drill is 2 15/16" and I deceided not to use...

    The drill is 2 15/16" and I deceided not to use it so I milled the bulk of material out with a 3/4" ball end mill, leaving about 1/8" stock for clean-up with the boring tool (shown above). If I went...
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    Here is the progress after bandsawing and milling...

    Here is the progress after bandsawing and milling the basic shape. At this point, the center line bore was not done yet. The machine that is pictured above is a DeVlieg jig mill that weighs in at...
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    This is the starting point, a 37# block of 7075...

    This is the starting point, a 37# block of 7075 alum that I happened to have. The original front crankcase half of a 44 weighs about 3# and isn't up to doubling the horsepower without problems. The...
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    The turbo 44 was used mostly on hydros that were...

    The turbo 44 was used mostly on hydros that were 'iffy' at speeds over 90, but many times I was still pulling quite hard at 90. The automatic boost controller on the turbo didn't seem to work for me...
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    Not pretty? Maybe I'm like a dad that thinks his...

    Not pretty? Maybe I'm like a dad that thinks his kids ARE pretty, but no one else does. In my eyes, it just doesn't get much prettier than this! BTW, I think that racers that run without cowls will...
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    Nitrous!

    Tim, Sunday is way better for me because I won't be getting my nitrous tanks back from filling until Saturday afternoon. Have you ever tried the direct port mega-fogger super blast nitrous system on...
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    HP to weight advantage?

    Tim, I'm glad you brought it to my attention about the 2 1/2 to one HP advantage I have over you. IMO, that's cutting it a bit close, I prefer at least a three to one HP advantage over anyone I line...
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    C' mon Tim!

    [QUOTE=Tim Kurcz;110680] Not to worry, though. There’s one more opportunity to secure a quality shoot at Dixon Smith’s where it will run side-by-side with his 2.5 Merc drag hydro.

    Tim, I'm...
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