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Thread: Gt Pro -- New Class For Region 8

  1. #131
    Team Member Chairman's Avatar
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    It should bolt up just fine. The only issue I can think of is the water tube. They changed to a slightly shorter tube in 1985. But if you put the exhaust tuner from the '87 motor on the '80 powerhead the water tube will fit.

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  2. #132
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    Rich,

    Are going to be racing with us this summer? Where are you located?

    Bob

    Tunnelboat and V-bottom Plans for 15-35 hp, 40-60 hp, 60-80 hp

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  3. #133
    Team Member Smokin' Joe's Avatar
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    Quote Originally Posted by Chairman View Post
    It should bolt up just fine. The only issue I can think of is the water tube. They changed to a slightly shorter tube in 1985. But if you put the exhaust tuner from the '87 motor on the '80 powerhead the water tube will fit.
    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 yank the rope ... .

  4. #134
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    If the older tuner is used, a longer water tube will be needed. The easiest solution may be to cut down a tube from a long shaft motor. The tube does not need to have a shoulder on the upper end, and in fact I don't think they were made that way in that era.

    An examination of the two tuners will reveal that the rubber grommet is positioned higher on the older one, and will tell you how much longer the tube must be.

    A couple of years ago I put a 1984 powerhead on a 1990 midsection and nearly tore my hair out trying to figure out why it wouldn't pump water. A $50 water pump didn't fix it; a $10 used water tube finally did.

    Tunnelboat and V-bottom Plans for 15-35 hp, 40-60 hp, 60-80 hp

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  5. #135
    Team Member Smokin' Joe's Avatar
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    Quote Originally Posted by RTM View Post
    I`m putting together a GT Pro motor. I picked up a complete `87 Evinrude 25hp short shaft motor that is in need of a powerhead. Original powerhead is internally rusted due to a blown head gasket. I found a complete `80 35hp Evinrude powerhead. Will it bolt up to my `87 mid ?

    rich
    Don't expect to be the fastest boat on the course with a complete set of 1980 powerhead parts. Or 1988 and later.

  6. #136
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    OK Joe, we all want to be at or near the front. I know zilch about the 31.8 OMCs, except that I had a new `78 model 0n a 13' Whaler years ago. So what do I need for the fast parts?
    Rich

  7. #137
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    Quote Originally Posted by Smokin' Joe View Post
    Don't expect to be the fastest boat on the course with a complete set of 1980 powerhead parts. Or 1988 and later.
    That seems a bit pessimistic. I've won two highpoints championships with a 1994 motor, one with a 1990 and one with a 1984. The '90 and '84 were run on the same boat, identical performance.

    I'm sure it would be nice to have the perfect motor with all the "best" parts, but there's no need to be discouraged about running the average motor.

    Tunnelboat and V-bottom Plans for 15-35 hp, 40-60 hp, 60-80 hp

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  8. #138
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    Quote Originally Posted by Chairman View Post
    That seems a bit pessimistic. I've won two highpoints championships with a 1994 motor, one with a 1990 and one with a 1984. The '90 and '84 were run on the same boat, identical performance.

    I'm sure it would be nice to have the perfect motor with all the "best" parts, but there's no need to be discouraged about running the average motor.
    I agree there Bob, too many variables to call starting with racing an oval, driver skill & even luck.

  9. #139
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    What about gear ratios, is there a difference between the 25 and 35? Are all years the same?
    Rich

  10. #140
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    Quote Originally Posted by Chairman View Post
    That seems a bit pessimistic. I've won two highpoints championships with a 1994 motor, one with a 1990 and one with a 1984. The '90 and '84 were run on the same boat, identical performance.

    I'm sure it would be nice to have the perfect motor with all the "best" parts, but there's no need to be discouraged about running the average motor.
    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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