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Author Topic:   Mounting engine on 13' sport

bjh517 posted 06-25-2002 08:25 PM ET (US)
I am mounting a new 50 hp Johnson on an 1982 13' sport. What are the "rules of thumb" concerning mounting an outboard engine? I vaguely remember hearing something should be exactly inline with the bottom of the boat when in the running position. Was it the cavitation plate, prop spline?? Please help. Any advice??
Bigshot posted 06-26-2002 09:44 AM ET (US)
Cavitation plate should be level with bottom of hull. But you should raise the engine up a bit to get better performance.
Tom W Clark posted 06-26-2002 10:22 AM ET (US)
There is nothing "exact" about the height of the cavitation pate relative to the keel. Different boats and boat owners will do different things.
Boats and motors are generally designed so the cavitation plate can be below the keel about an inch or so. If you hang your motor on the transom in its lowest position you will see that this is the case.
Virtually all large outboards have multiple bolt holes so you can adjust the motor upwards. This may or may not be desirable. You can experiment.
In the case of a Johnson 50 on a 13' drill the mounting holes so you can be all the way down and work up from there if you feel the need.
11 footer posted 06-30-2002 03:17 PM ET (US)
a 50 on a 13?
seams like too much power.
jimh posted 06-30-2002 04:46 PM ET (US)
And a lot of weight, too.
Wille posted 07-01-2002 12:11 AM ET (US)
Cavitation plate with lowest part of hull, even 1/2 an inch above is OK.
13' whaler rated for 6 hp to 40 hp. 50 hp is too,too much for that little boat. (Weight and hp)
A 40hp is almost too much, but will make that little vessle scream. Be careful and have fun.
Bigshot posted 07-01-2002 09:59 AM ET (US)
Personally I would get a 15'. If speed you are seking.....get a 15. that 13 will not be that much faster with a 50 than a 40 due to hull design and efficiency. I had a 35 on mine and a bud had the same year 35 on his 15 and he was faster than my 13.

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Author	Topic: Mounting engine on 13' sport
bjh517	posted 06-25-2002 08:25 PM ET (US) I am mounting a new 50 hp Johnson on an 1982 13' sport. What are the "rules of thumb" concerning mounting an outboard engine? I vaguely remember hearing something should be exactly inline with the bottom of the boat when in the running position. Was it the cavitation plate, prop spline?? Please help. Any advice??
Bigshot	posted 06-26-2002 09:44 AM ET (US) Cavitation plate should be level with bottom of hull. But you should raise the engine up a bit to get better performance.
Tom W Clark	posted 06-26-2002 10:22 AM ET (US) There is nothing "exact" about the height of the cavitation pate relative to the keel. Different boats and boat owners will do different things. Boats and motors are generally designed so the cavitation plate can be below the keel about an inch or so. If you hang your motor on the transom in its lowest position you will see that this is the case. Virtually all large outboards have multiple bolt holes so you can adjust the motor upwards. This may or may not be desirable. You can experiment. In the case of a Johnson 50 on a 13' drill the mounting holes so you can be all the way down and work up from there if you feel the need.
11 footer	posted 06-30-2002 03:17 PM ET (US) a 50 on a 13? seams like too much power.
jimh	posted 06-30-2002 04:46 PM ET (US) And a lot of weight, too.
Wille	posted 07-01-2002 12:11 AM ET (US) Cavitation plate with lowest part of hull, even 1/2 an inch above is OK. 13' whaler rated for 6 hp to 40 hp. 50 hp is too,too much for that little boat. (Weight and hp) A 40hp is almost too much, but will make that little vessle scream. Be careful and have fun.
Bigshot	posted 07-01-2002 09:59 AM ET (US) Personally I would get a 15'. If speed you are seking.....get a 15. that 13 will not be that much faster with a 50 than a 40 due to hull design and efficiency. I had a 35 on mine and a bud had the same year 35 on his 15 and he was faster than my 13.