horsepower of a Kawa. 650

inohv8

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I am taking on a project using a Kawasaki 650 jet drive (pump only), does anyone know the max rpm necessary and max horsepower needed or used? in the real thing?
 

Jeff Walkowiak

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Re: horsepower of a Kawa. 650

about 7 k rpm not sure on hp probably in 60 to70 hp range what you doing with this i just have to ask, curious type
 

inohv8

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Re: horsepower of a Kawa. 650

got an drive unit on ebay, just thought I would prepare for a winter project and put it in a small boat,, I have an old 20 horse chrysler outboard with the lower end toasted.. not sure how project ill work on 20 horse, water intake for engine cooling fed from seperate pump. just a toy to work on.. thanks for the info.. I appreciate it..I think the chrysler max is about 4.5K rpm
 

Jeff Walkowiak

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Re: horsepower of a Kawa. 650

well it will be a dog ,jet pumps are no where as efficient as props ,so a 20 hp jet drive will probably only go 5mph the kaw pump has a hose for water supply to the engine so you can use it for water and run a hose out the back but I think its going to end up being a bad idea when all is said and done, your lower unit is the exhaust system for the engine and you will need to deal with the exhaust plus water is expelled in to the lower unit to cool it in normal use,you should have found a lower unit on e bay,Well maybe you can sell the jet pump on e bay to some one with a broken jet ski, we did not even touch base on the water intake grate for the jetpump .
 

inohv8

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Re: horsepower of a Kawa. 650

The chrysler idea was just a thought.. I have other ways and options, I do in fact have a high power drive that may be able to be connected, it is the equiv. of about 50 hp and 8000 rpm max. (electric drive (aircraft starter generator), I used it in an electric car I built., then into an electric motorcycle (that one almost killed me). I know what your going to say... to much weight in batteries.. but I do not intend to use batteries..<br />Na, the pump has potential, and the lower unit on the chrysler is repairable, I just need some toys to work on over the winter.<br />thanks for the comments.<br />stan.
 

Jeff Walkowiak

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Re: horsepower of a Kawa. 650

if you want something to work on build a rotary engine powered jet ski thats the perfect power plant rpm,horse power to weight ratio etc I can't believe they are not used more in marine use.
 

inohv8

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Re: horsepower of a Kawa. 650

gotta find an old 70s mazda somewhere.. and your right, that would be the best engine for it, plus they use up less room..
 

Jeff Walkowiak

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Re: horsepower of a Kawa. 650

the new mazda is way better with side ports it hardley uses any oil and dosen't smoke, but it would rock in a jet ski or boat and it builds up hp in the higher rpm bands like crazy ,I just don't understand why its not used and it is a simple design even easier to work on than a 2 stroke. and mazda is doing work on a turbo for them , turbo's are excellent in boats because you have an unlimited supply of water to keep them cool that was the only problem with them in a car they get hot and ruin the oil causing the berrings to fail, imagine a rotary outboard and the side port engine passes emissions so the environmental issue is no big deal, the ports hold heavy un burned gases in the engine and do not allow them to escape till they have burned enough to meet the emission standards. I just think its a great application for these engines we should tell mazda to get in the boat business honda kaw yam why not mazda all those japanese love taking our money.
 

Jeff Walkowiak

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Re: horsepower of a Kawa. 650

since im an inventor with us patents let me expound on something else reguarding pwc, jet drives are absoloutely inefficient in comparison to prop driven boats so why not do an enclosed prop driven jet ski with a tunnel to feed the prop the water it needs that keeps people away from it and improves the performance by 20 to 30 percent, adding speed even with reduced horse power and greatly improves fuel consumption ,another question for the watercraft gods.I remember when I was a kid watching the hydroplane races some of them were small like a jet ski is today with onlt a 9.9 engine they hit speeds in the 40's and we are talking about old engines back in the early 60's when hp to weight was horrid, example a 10 hp engine probably just the power head would weigh what a 130 hp efi jet ski engine weighs now, the possabilities are practically limitless.OK mi done .
 

inohv8

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Re: horsepower of a Kawa. 650

I got creative 2 years ago and built a ducted prop drive, using a honda car engine 1.5L delivering 92 horse.. the duct was made of stainless with a partial lower unit from an 85 horse chrysler, the problem I had was to convert from vertical shaft back to vertical shaft but 12 inches lower.. I ended up using two lower units for this.. the end result was to much reduction and the engine had insufficient torque.. so one of the lower units was reversed.. now I had lots of engine rpm and low rpm at the prop... I gave it all I had and the gear boxes basically melted away.. I gave up due to the fact my wife was pissed... it was a great project.. especially using a honda engine.. I had wires everywhere and t he ecm was here, the throttle body over there, the safety cct. over there.. but it did run and my modifiations were solid.. I still have the engine sitting on the cradle I built, ready for the next project.. oh yes, the boat I used was a 16 foot trihull bowrider which my son called frankinstien.. alas franky has been given to a friend wiith a 28 horse on the transom.. <br />ready for the next project......
 

Jeff Walkowiak

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Re: horsepower of a Kawa. 650

I have a standard motto that I always go by even in my patented steering it is always incorperated in every one of my designs It is K I S S .first I design it then I spend all the time on the K I S S principal and re desing it .Works for me.
 

inohv8

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Re: horsepower of a Kawa. 650

That's the only way to go with designs.. my motto is (from an old shop teacher), "form follows function", first make it up so it works, then the finess comes in...<br />thanks for the comments.<br />stan
 

CFronzek

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Aug 11, 2002
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Re: horsepower of a Kawa. 650

inohv8,<br />Making a standard hull into a go-fast is not a slam dunk.<br />Don't know much about pump drives but I do know that production pump drive hulls have special stern shape that helps the pump work properly.<br />Charlie
 

inohv8

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Jul 2, 2004
Messages
114
Re: horsepower of a Kawa. 650

I realize the keel is in the way.. there would be an amount of modification, but I don't really want to destroy my 10 footer.. it's a fun boat.. so the pump will either sit for other thoughts or sell on ebay I suppose..<br />thanks for the feedback.<br />stan
 
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