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  1. Replies
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    Sticky: Prop work at Kankakee

    I'll be at Kankakee with pitch gauges and other tools to rework props on the spot. One-time charge, unlimited free reworks.

    I'll have a Hill-McCauley SST-45 prop along in case anyone in that class...
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    Sticky: There's a big difference in high speed jets, and...

    There's a big difference in high speed jets, and I'm not sure why. The 35 carbs came with 59Ds, the 30s came with anywhere from 61D-65D, and I don't know what's the right jet for the 30 carb. I've...
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    Sticky: Maybe it's a 1993 block. I have block that was...

    Maybe it's a 1993 block. I have block that was given to me, late model, my dealer friend identified it as early 1990s because of the extra ports. Has not the usual identification on the block,...
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    Sticky: [QUOTE=Chairman;90102]As far as I know, the only...

    [QUOTE=Chairman;90102]As far as I know, the only difference in gear ratios comes with the 1976 35hp. The ratio changed with the 1977 and has been the same since.

    What's the 1976 GR? I don't...
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    Sticky: Small vertical slit-style extensions of the ports.

    Small vertical slit-style extensions of the ports.
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    Sticky: That could be due more to boat bottom, setup and...

    That could be due more to boat bottom, setup and prop. The '94 block does have the extra small 'fingerfile' ports but I have no idea of their effect.
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    Sticky: Don't expect to be the fastest boat on the course...

    Don't expect to be the fastest boat on the course with a complete set of 1980 powerhead parts. Or 1988 and later.
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    Sticky: Gaskets are different so you may need 1980 tuner...

    Gaskets are different so you may need 1980 tuner to make the water tube fit. You won't have mechanism to prevent starting in gear either but that matters less. As long as you're not standing when you...
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    Sticky: So with offset it's effectively a bit lower than...

    So with offset it's effectively a bit lower than 21". Reasonable. I'm waiting to hear report of a fast tunnel running a good 10x17 or 10x18. The Yamaha cleavers are not what I have in mind.
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    Sticky: My experience with v bottoms is that you'll kill...

    My experience with v bottoms is that you'll kill handling if you jack the motor toward 'split bullet'. We ran around 21" height in EP, sometimes, depending on boat.prop, 22".
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    Sticky: PS By mixing parts from different years I can...

    PS By mixing parts from different years I can make something that's a bit faster than a 1982 model. My personal motor is 1983, it's fairly fast (41.5 mph on a 350 lb 15' boat), after a lot of tricky...
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    Sticky: I removed the plastic restriction from a '78 25...

    I removed the plastic restriction from a '78 25 carb and it still measures 1-2mm in inside dia.
    less than a 1976 35 venturi restriction. I tried it (with 59D) jet on the 1978 25 and had to turn the...
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    Sticky: It's not the leaves themselves but the flat leaf...

    It's not the leaves themselves but the flat leaf plate that is an enormous restriction to air flow. Nothing can be done about that in a stock class, relatively and little in a mod class.
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    Sticky: 20/25/30/35 Differences

    Both Bombardier and the original OMC parts list show both 30 and 35 hp motors for 1986-1993, but a search of the parts lists shows no difference between the two. Apparently, there was no difference...
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    Sticky: You didn't tell us the prop size and brand. RPM?

    You didn't tell us the prop size and brand. RPM?
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    Sticky: What's p.d.f.?

    What's p.d.f.?
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    Sticky: PS Nerstrom recommends his 3 cyl looper 35, but I...

    PS Nerstrom recommends his 3 cyl looper 35, but I have yet to see one for sale. Next choice: a Mark 55 with a tiller handle, but they're rare and expensive as well. Plus, I'll never find a tiller...
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    Sticky: Here's the power curve below. Jim Nerstrom...

    Here's the power curve below. Jim Nerstrom pointed out to me that you can't get much power out of the 2 cyl. 35 because of the intake system. That's easy to understand: like the shock mounts, the...
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    Sticky: I also don't understand why, when your Vs are...

    I also don't understand why, when your Vs are running a 20-21" transom height while your tunnels are running with the gearcase bullet above the sponsons, and you're both running essentially the same...
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    Sticky: I don't understand why you have a problem at...

    I don't understand why you have a problem at 20-21". You're running a jack plate, and with no offset on a 13'-14' Allison I could pump water with the OMC 75 (or Mercury 850) at 22.5" transom height,...
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    Sticky: We couldn't run closed course anywhere that high...

    We couldn't run closed course anywhere that high in the V classes without losing control, only for straightaway records. What's the transom height measured from pad center?
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    Sticky: The only time I saw a need for a low water pickup...

    The only time I saw a need for a low water pickup on an SE boat was in time trials.
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    Sticky: Just be sure to run 25:1 Evinrude, Mercury,...

    Just be sure to run 25:1 Evinrude, Mercury, Castrol or Yamaha 2 stroke oil.
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    Sticky: 46-47 mph@6700RPM with 10x16-17" cleavers, the...

    46-47 mph@6700RPM with 10x16-17" cleavers, the optimal prop doesn't yet exist. The boats should bereak 50 mph if the right props could be found. I reworked the Yamaha cleavers that some are running,...
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    Sticky: What brand prop, also dia x pitch? I run a 1983...

    What brand prop, also dia x pitch? I run a 1983 35 on a 350 lb 15' Allison, runs over 41 mph with and into wind (41.5 mph avg., 6050 RPM) but I wouldn't be able to run 20" high, run 19 1/4", 19 1/2"...
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    Sticky: Impeller was 'welded' to the impeller housing,...

    Impeller was 'welded' to the impeller housing, clearly was run without water.
    I separated the cylinders on my best 3 cyl. racing block in 1986 when I picked up a plastic bag that covered the water...
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    Sticky: Thanks, useful to see how you label pitch so we...

    Thanks, useful to see how you label pitch so we can compare notes better. I generally take the chord at the leading edge, but with little camber there. I couldn't see the dia.x pitch nrs. for...
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    Sticky: Looks like a 1980 35 I bought recently. Piece of...

    Looks like a 1980 35 I bought recently. Piece of junk with both sleeves separated from cylinders. However, I also bought another powerhead and 2 blocks, so will be a screamer when rebuilt. Now have a...
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    Sticky: How many RPM? How high are you running the...

    How many RPM? How high are you running the propshaft compared with lowest point on front sponsons? Thanks for the info!
    Joe
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    Sticky: GT Pro

    Beautiful photo, nice to see the small motor action in the U.K.!
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    Sticky: GT Pro Class

    Ron,

    My plans are ambitious because I'm only in the U.S. Aug.-Nov. each year.
    I'm trying to buy some abandoned fishing motors cheap for rebuilding.
    I've talked with Bob Dillon, solid mounts are...
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    Sticky: GT Pro Class

    Since these posts I've been contacted by 2 guys in La. with 35s on tunnels who want to know how to make them go faster. The GT Pro class should be encouraged/supported in Texas/La. as a start to...
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    Sticky: 15' Allison, same running surface as my record...

    15' Allison, same running surface as my record setting XR-14. Just a fishing boat.
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    Sticky: GT-Pro Class

    This looks like an extremely attractive class! Boat racing has become far too expensive since my era of 1977-'85 in EP and mod VP. The old OMC 35 runs, I have one that I rebuilt (with .060" milled...
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    Sticky: Send me a photo, I may take it off your hands...

    Send me a photo, I may take it off your hands since he didn't pay. But what are dia. and pitch? I can use 10x15.

    Joe
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    Sticky: Ok, I see. you got another one at that price? ...

    Ok, I see. you got another one at that price?

    Joe
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    Sticky: Ron, What's the price of the gt pro props? ...

    Ron,

    What's the price of the gt pro props?

    Joe
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