replace an pwc engine with a diesel engine

[luxurynick]

Hey guys,

I need to know what would be the best way to build a diesel pwc from an old hull. Or just how would it work to replace an existing engine with a diesel engine. I would really like to build one just to say I can. It would probably not be legal on any lakes.

Thanks in advance

 

[ger87410]

Why wouldn't it be legal?

How big of a diesel engine would it take to produce 60 hp? Would that engine fit?

What's the biggest engine you can fit in said old hull?

Let's not worry about how fast it will go, just if it'll work. :biggrin:

 

[brett]

too heavy! a 60 horse kubota or yanmar probably weighs close to 4-500 lbs, maybe more

a 30hp turbo yanmar boat engine may work

 

[ger87410]

OK, let's concentrate on weight and size.

Anyone know what the biggest diesel engine U can fit in a sitdown hull?

I figured he'd use a sitdown hull since it's bigger.

 

[monsterSJ]

good luck

 

[brett]

here ya go
http://www.yanmarmarine.com/uploads/products/pdf/JH/4JH3_DTE_TechData.pdf

but for size and weight, probably couldnt get anything bigger than this, either way it would probably cost as much as a new sj
http://www.yanmarmarine.com/uploads/products/pdf/GM_YM/3YM30_TechData.pdf

 

[monsterSJ]

the cost to do this is gonna be huge and its gonna be a turd

 

[brett]

the cost to do this is gonna be huge and its gonna be a turd

yup

 

[WaveDemon]

sounds like my thread from about a week ago...


http://www.x-h2o.com/threads/33226

 

[Endo]

Actually it may be doable.

http://www.evworld.com/news.cfm?newsid=11230

 

[#ZERO]

Diesel engines do produce a lot of torque down low but it would never rev up quick enough for a jet-ski application.

Also the bearings wouldn't last very long due to the higher compression ratio.

 

[ger87410]

Diesel engines do produce a lot of torque down low but it would never rev up quick enough for a jet-ski application.

What about gearing it between the engine and PTO?

 

[tor*p*do]

gears rob power and add even more weight

 

[brett]

the only way to do it would be to use a hydraulic system with a diesel power unit

 

[dirtyoz]

Turbine, but the gear reduction would be heavy.

 

[ger87410]

If you're going to go turbine, why have a pump at all?

 

[Ericfox]

you could make it run off old french fry oil! that would actually be pretty cool!

 

[ger87410]

Great!

Smell like Mcdonald's while you're driving.:crazy:

U know they pay people to haul that stuff away?

 

[WaveDemon]

you can't actually use mcdonald's. the oil is hydrogenated.

 

[Ericfox]

arbys? those frys are good