How to choose a suitable engine

[Daveynireland]

Have to agree with Jack frost. In my opinion the engine is your most important piece of safety equipment. It will get you out of trouble more often than a life jacket! There will always be an occasion when you wish you had more power. My Macwester 27 had a 12hp Yanmar engine when I bought her. After a season of sailing I change to a 20hp Nanni. (Kubota based unit) Beautiful little engine. Much more like the power I felt comfortable with. My next boat is a 37' steel Shadow. It comes with a 20hp engine. Joke! That's getting up graded to 40-50 hp before she even hits the water!

[Frosty]

Engine manufacturers do say today that no break in is required due to the machining tolerances that are extermely accurate. I dont agree,-- breaking in 'bedding of the rings' is important on a new engine. After that not so important. It is certainly not such an issue as to carefully choose a used engine that has exactly the right power requirments.

[Jimbo1490]

Jack,
the deal is that they are using rings that are already polished when installed and they final hone the cylinders to a 600 grit finish. There really is no break-in; it was done on the honing machine and at the piston ring factory. But if it makes you feel good to do some kind of a 'break-in', go ahead, it won't hurt anything. It can be a sort of ritual like breaking a champagne bottle over the bow

Jimbo

[Frosty]

Jimbo--600 grit???-- I used to use 80,-- I usually use 600 to polish automatic transmission valves, or brake cylinders.

Evan plasma coated rings ( new types ) need bedding--initially.

[Jimbo1490]

Yeah 600 grit! The last two engines I built spec'ed a 600 grit final hone and the instructions that came with the ring set said flatly no break-in was necessary. I heard Click and Clack recently say that all the auto makers are using basically the same type rings. Probably cuts down on a lot of warranty and arguments with the service dept. By the time they drive it from the production line to the car carriers it's broke in

Jimbo

[faneca999]

hello! i thing you talk portuguese...
e o seguinte:
tenho planos de 2 dos seus barcos, o "Pilgrim 590" e do "Kavalier 800" queria construir em prencipio o primeiro. mas de onde tirei os planos nao esta em portugues.pedia que me ajuda-se em algumas questoes, pois nem sei, por exemplo do material e premenores de construção da quilha, por exemplo. gostaria que me ajuda-se.. obrigado


abraço

[faneca999]

axo que falas portugues.

tenho planos de dois dos teus barcos . mas de onde os tirei nao estava em portugues. gostaria que me desses uma ajuda, pois tenciono construir um deles. em prencipio o de 5,9 metros. obrigado pela atençao despendida

fica o meu e-mail: sky_walker_x@hotmail.com

abraço

[MMNet SEA]

Originally Posted by orang laut

Hello folks,

I'm coming in here with some questions regarding choosing a suitable engine. Have a basic clue that there has to be some sort of correlation between the amount of hp with the size/displacement/purpose of a boat; one doesn't plonk in a 115hp Ford to move a 15 tonne cruiser... this much I'm sure of.

Is there a basic calculation?

Boatbuilding plans are in progress, and would be helpful to be able to narrow down the cost of obtaining, installing, maintaining & all the other
-ings beforehand.

The engine is intended for a wooden sailboat that's about 37' on the waterline, my (uninformed) guess is that it would weight around 12 to 15 tonnes all in.

Would be helpful if explainations could be given in chick-friendly lingo.

Thanks in advance

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If you are near Langkawi - send me a email I will direct you to a yachtsman who is changing engines - good price .

[Daveynireland]

try http://www.castlemarine.co.uk/pitch.htm

[orang laut]

Originally Posted by MMNet SEA

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If you are near Langkawi - send me a email I will direct you to a yachtsman who is changing engines - good price .

MMNet SEA, sounds good to me. Can private msg me if info highly confidential, though might be good advertising for the man forementioned