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Old 11 April 2012, 13:45   #11
Boatnomad's Avatar
Country: Ireland
Make: Zodiac Mk I
Length: 3m +
Engine: 15 hp Yam two stroke
Join Date: Feb 2012
Posts: 728
It is normal,the exhaust makes my 15hp warm to touch after a short time.

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Old 11 April 2012, 13:56   #12
lockieboi's Avatar
Country: UK - England
Town: kent
Boat name: SIBotage
Make: Prowave
Length: 3m +
Engine: 15hp Johnson 2 smoke
Join Date: Sep 2010
Posts: 435
Thanks for clearing that up.

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Old 17 April 2012, 17:16   #13
Country: UK - England
Town: London
Boat name: Yellow Peril
Make: Ribcraft
Length: 5m +
Engine: Yamaha 100 (2T)
Join Date: May 2006
Posts: 82
Originally Posted by lockieboi View Post
Thanks for clearing that up.
Very approximately; pedants welcome to have a go....

Assuming 33% efficiency and WOT, a 15hp engine may be trying to shed 30hp of heat. That's about 20kw. Some is shed via the exhaust gases, some via the water - and remember most cooling water exits via the exhaust too.

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