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Manual transmission in a boat!!!!

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Old 12-04-2011, 03:50 AM
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Default Manual transmission in a boat!!!!

Some boats use a velvet drive trans. I even see some variations of the powerglide 2 speed (coan). A multi speed transmission with closer gear ratio would help some boats accelerate.

Why not a manual trans with a clutch?
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Old 12-04-2011, 05:31 AM
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Some boats use a velvet drive trans. I even see some variations of the powerglide 2 speed (coan). A multi speed transmission with closer gear ratio would help some boats accelerate.

Why not a manual trans with a clutch?
HI vtown. My first boat was a 16ft shaksphear powerd by a 3.8 jag motor with the 4spead manual trans which went through a u drive then to a stern tube and rudder , we even had the wooden jag dash pannel for the gauges ,bit of a crazzy boat ran about 55mph had a faily flat bottom .first time i took it out we never had any seats in it just 2 x 5gallon steel drums to sit on ,i still have the scars . i have seen a few ski race boats here in England that run auto trans th400 but they take up alot of room in the boat . regards paul
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Old 12-04-2011, 07:18 AM
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Weismann Marine/Traction Products has been making multi-speed transmissions for boats for years, including the six-speed units they used in Class 1 until they were outlawed.
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Old 12-04-2011, 10:03 AM
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Weismann Marine/Traction Products has been making multi-speed transmissions for boats for years, including the six-speed units they used in Class 1 until they were outlawed.
yes they do, but they arent the kind that the OP is talking about, with a clutch like you find in a car.

I dont know why it wouldnt work, but unless you are going really fast, a multispeed trans isnt going to help you.
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Old 12-04-2011, 12:46 PM
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Do you really one more thing to break on your boat



Multiple speed trans' have some pretty specific applications involving very high performance boats that require the need to carry a larger prop at slower speeds but still maintain an optimum rpm. I don't think you could shift fast enough to get it to work
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Old 12-04-2011, 02:28 PM
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I have a friend with basically just this. A manual gearbox (from some car) and he put a automotive bell housing wit a clutch and pressure plate/throw out bearing and he installed a hand clutch lever.

He merely pulls the clutch in and shifts the transmission kinda like an old farm tractor.
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Old 12-04-2011, 06:37 PM
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We use a manual clutch for FNR on some boats. The multispeed we do with a computer controlling the shifts and no clutch.

The biggest problem with a boat is it is like trying to shift when doing a burnout. It is very hard to do correctly but not impossible.

John Connor (Kaama) used to shift our box between the waves in the air, clutchless ,and manual 2 speed, with a cable. Two boxes at the same time. But that was John.

It will allow for a better prop selection with better acceleration and top end.

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Old 12-04-2011, 08:41 PM
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John Connor (Kaama) used to shift our box between the waves in the air, clutchless ,and manual 2 speed, with a cable. Two boxes at the same time. But that was John
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Old 12-04-2011, 09:21 PM
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We use a manual clutch for FNR on some boats. The multispeed we do with a computer controlling the shifts and no clutch.

The biggest problem with a boat is it is like trying to shift when doing a burnout. It is very hard to do correctly but not impossible.

John Connor (Kaama) used to shift our box between the waves in the air, clutchless ,and manual 2 speed, with a cable. Two boxes at the same time. But that was John.

It will allow for a better prop selection with better acceleration and top end.

pat W
What do you guys charge for your 3 speed auto trans?
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Old 12-06-2011, 01:36 AM
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For what power and what boat?

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