Sled engine versus Sea-Doo engine

[ponyboy]

I am wanting to put a jet drive into a semi V bottom Jon boat . 16 ft , the problem is finding a complete sea-Doo drive system short of buying a complete machine. Sled engines are a dime a dozen and cheap enough to rebuild if one had to . Now I know you should never run a sled engine with out the primary or the pipes . So my question is if I went to a sled engine would it always be in gear.... My boat will not go up River and I do not want to spend 40 large on a boat that will ... thanks pony boy

 

[ponyboy]

they say theres no such thing as a stupid question .... after 65 views ... and still know answers ???? mabey I should of asked Alex Trebeck

 

[DaveB]

Sled engines are tuned to make power at a higher RPM. That said, I sold my old XLT 600 triple with the stock pipe to a guy that ran it on a mini-jet deal in a boat. It eventually blew up though.

 

[ponyboy]

Sled engines are tuned to make power at a higher RPM. That said, I sold my old XLT 600 triple with the stock pipe to a guy that ran it on a mini-jet deal in a boat. It eventually blew up though.

all good things come to an end Dave ..... but that don't answer my question

 

[ponyboy]

sorry Dave ....hope I did not sound rude there ..... but did this fellow take into consideration that this concept ( sled engine in boat )would require a rad , not tunnel coolers .... , and could not be run at WOT all the way across even in the smallest of lakes ..... sled engines are tempermental I know , and if I where to go with one it would not be an 65 hp xlt engine .... more like 150 hp ....this is why im am asking questions now and not later .... I don't want to ask later WTF did I do wrong ????

 

[DaveB]

Boat Motors vs. Snowmobile Motors - General Discussion - DOOTalk Forums

 

[ponyboy]

Boat Motors vs. Snowmobile Motors - General Discussion - DOOTalk Forums

I read the first thing I saw ..and should read more but I wont ... I have a 115 hp ob IL6 merc ( tower of power ) on my boat , and I have started it with a rope .....what is your honest opinion .... find a seadoo engine with the works , or try a sled engine .... pros an cons ????

 

[CUSO]

I am wanting to put a jet drive into a semi V bottom Jon boat . 16 ft , the problem is finding a complete sea-Doo drive system short of buying a complete machine. Sled engines are a dime a dozen and cheap enough to rebuild if one had to . Now I know you should never run a sled engine with out the primary or the pipes . So my question is if I went to a sled engine would it always be in gear.... My boat will not go up River and I do not want to spend 40 large on a boat that will ... thanks pony boy

I am sorry, but I have no idea what you are asking...Proof reading goes a long way.

would it always be in gear < is this your question?

My answer is, it all depends on you. There are no pictures, or explanation of your setup.

I think the best thing is to buy an old sportster, or seadoo, and do the swap.

 

[DaveB]

I read the first thing I saw ..and should read more but I wont ... I have a 115 hp ob IL6 merc ( tower of power ) on my boat , and I have started it with a rope .....what is your honest opinion .... find a seadoo engine with the works , or try a sled engine .... pros an cons ????

I would find a seadoo engine (or Yamaha, or, or)...with pump and exhaust. Every boat motor I've seen has water cooled exhaust and turns waaay lower RPM than a sled motor. I *think* the cooled exhaust allows the motor to run more radical timing and/or compression. (The guy who put my ol 600 in a jet boat, ran a proper closed loop cooling system with a heat exchanger....it was done right....not sure why it calved)

In any case, I am no more educated on the subject than you....just kind of curious as well as it could be a cool project. I'd try some boat forums....

 

[Iron Horse Racing]

Buy an old sea doo and swap it out, you'd need the cooling system and pump any way. Lots of old sea doos for sale.

or find and out board jet drive and bolt it on and go

 

[ponyboy]

yes , will it be in gear ,that is the question ...... if I try to start this in water , would it be like starting your sled with the throttle stuck , is there a nutral , or would I be chasing this thing across a sand or gravel bar the second it started ....... as far as the seadoo swap goes .... I can doo that

 

[CUSO]

The PWC's that I know of have a constant drive, the sportster type boats might have a neutral.

A buddy of mine had an old one, and I am not sure if he kept it or sold it. The boat was not taken care of, but the motors were fine. It was a twin 583 I believe. That thing went pretty good.

yes , will it be in gear ,that is the question ...... if I try to start this in water , would it be like starting your sled with the throttle stuck , is there a nutral , or would I be chasing this thing across a sand or gravel bar the second it started ....... as far as the seadoo swap goes .... I can doo that

 

[ponyboy]

thanx cuso..... sled engines have a clutch that allows them to sit idle I know as I have owned several in the past ... the last sea doo I rode was a supercharged kawasaki, and it did not move while idling ..... so is there a way to use a sled engine that will not F$%^&*k off on me when it fires up LOL

 

[lilduke]

NM has a 1100T motor for sale with 0kms...

 

[ponyboy]

thanks Lilduke ... but that don't answer anything I wont to know ...... I think I will just go over to JBBs beer an babes and call it a night

 

[lilduke]

If you want real answers to your questions talk to Tyler Myers at outlaw/eagle marine. He's built all kinds of ch!t like that and can answer any questions you may have.


Ps a sled motor will idle fine without a clutch on it. This has been done lots.
Im not an expert tho call Tyler. They build some serious boats....

 

[cdnredneck_t3]

yes , will it be in gear ,that is the question ...... if I try to start this in water , would it be like starting your sled with the throttle stuck , is there a nutral , or would I be chasing this thing across a sand or gravel bar the second it started ....... as far as the seadoo swap goes .... I can doo that

Any Jet drive I have seen is direct coupled to the engine and is always spinning in the forward direction. Neutral and reverse come from a reverse thrust plate that is dropped half way down the jet discharge for neutral and all the way down for reverse. It is a very simple set up.

 

[KVF 700]

Recently just helped build a mini river boat with a buddy. First off, IT is MUCH simpler to get an old seadoo and start with that. The reason is, is because it has the pump, proper cooling and exhaust set up. Seadoo engines put out quite a bit less hp than there same cc skidoo engines. All the engine adjustments are fine tuned on a seadoo to run with the provided load. Simply put IT WORKS.
Next, a lot of the pump housings on seadoos are molded right into the fiberglass hull. So your options are a) cut out that chunk of fiberglass and fit it in your Jon boat. Or b) machine you own pump housing and wear ring.

Lastly to answer your question about being in gear all the time. When you fire it up, the boat immediately starts moving. Just like a seadoo. So you get in the boat and push off shore, then fire up the boat and let it idle for a while to warm up. During this time it slowly moves ahead.

You have a great idea, and I've thought about doing it to. There are some great ideas on you tube. They are more complicated than you think though.

 

[teamgreen]

I add no value to this thread, but whatever you fabricate, take pictures for the rest of us

 

[TROLLCAT]

chop up an old sea-doo you will have the project done way ahead of time and enjoy it more IE more time playin less time trying to make the friggin thing work