hotrodchevy83
Hotrodchevy83
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how about giving me the benefit of the doubt lol
Building monster go kart from scratch
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Gutteer
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why not just sell 2 of them and get a monster of a bike engine and make your kart scream way better than the jet ski motor could
Edit: plus it would be cool
Edit: plus it would be cool
DCProductions
Cockney Ragamuffin
I'm gonna bring in a little bit of R/C (sorry)
I've run rc boats and rc cars and I have to say there is a significant difference in the way the motors are tuned. Boat engines suck at running cars and car engines suck at running boats.
Now this is R/C so don't take this too seriously. Just 2 cents
I've run rc boats and rc cars and I have to say there is a significant difference in the way the motors are tuned. Boat engines suck at running cars and car engines suck at running boats.
Now this is R/C so don't take this too seriously. Just 2 cents
hotrodchevy83
Hotrodchevy83
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my boat screams lol
Gutteer
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Did you read what he just posted? water and ground have different friction amounts just because they make your water craft go pretty good doesn't mean they will work well/at all with your go kart in mind this being said if they do work and work well we have all learned something
edit: my post isnt meant to insult you in any way
edit: my post isnt meant to insult you in any way
fowler
New member
get someone to drive u along at 35 mph then get them to do the same at 70mph then choose with is more fun
what redsox and DC says is true
try water sking on sand
then u will see the friction differance
what redsox and DC says is true
try water sking on sand
then u will see the friction differance
bighead
New member
I would like to add a few cents here. I would find a doner sled if you have them in your area.
Check out this thread done by Killdozer. It is great way to use a sled doner. With his setup you use both the engine, primary and drivin clutches. You do not have to worry about belt allighments. He uses the doner frame and engine mounts. Original belt gaurds and brakes as well. Very smart and solid set up. You could gear it as well. I would love to see this setup on a buggy. It would be a worry free solid setup. Easy to install as well. I like not having to mess with belts and clutching. Killdozer gets builder of the year in my book. This set up kills about 8 birds with one stone. Best part is you could still swing arm it with ease. This should be standard for anyone using a sled engine.
Do you live in the states? even a 340 and 440 would have your buggy going like mad. Try to find a 340 or 440 fan cooled sled engine.
Here his thread and some pics. Amagine how fast this thing has got to be?
http://www.diygokarts.com/vb/showthread.php?t=9565
Check out this thread done by Killdozer. It is great way to use a sled doner. With his setup you use both the engine, primary and drivin clutches. You do not have to worry about belt allighments. He uses the doner frame and engine mounts. Original belt gaurds and brakes as well. Very smart and solid set up. You could gear it as well. I would love to see this setup on a buggy. It would be a worry free solid setup. Easy to install as well. I like not having to mess with belts and clutching. Killdozer gets builder of the year in my book. This set up kills about 8 birds with one stone. Best part is you could still swing arm it with ease. This should be standard for anyone using a sled engine.
Do you live in the states? even a 340 and 440 would have your buggy going like mad. Try to find a 340 or 440 fan cooled sled engine.
Here his thread and some pics. Amagine how fast this thing has got to be?
http://www.diygokarts.com/vb/showthread.php?t=9565
hotrodchevy83
Hotrodchevy83
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i know the motor has got a lot of torque not realy want it to run fast but run fast in short distance like low range
bighead
New member
Sled power my friend,
Are you thinking something like this? 440cc sled in Odyssey buggy.
Also how much does your engine go for? Are they spendy? I find 80's sleds in Oregon for $200 to $300 running.
http://www.youtube.com/watch?v=HtAZww3AMkM
I say sell the ski engine and buy a sled. You can even put the skis on the front if you have snow in your area. (area depending that is) Take a good look at the above setup. Just weld in the sled fram/mount and your done with the rear end. Try to use the original sled pipe like I did here. I think they run better using stock pipes.
http://www.diygokarts.com/vb/showthread.php?t=9403
I am going thru hell trying to get my belt right. I wish I did the above setup. I would never have to worry about it.
Are you thinking something like this? 440cc sled in Odyssey buggy.
Also how much does your engine go for? Are they spendy? I find 80's sleds in Oregon for $200 to $300 running.
http://www.youtube.com/watch?v=HtAZww3AMkM
I say sell the ski engine and buy a sled. You can even put the skis on the front if you have snow in your area. (area depending that is) Take a good look at the above setup. Just weld in the sled fram/mount and your done with the rear end. Try to use the original sled pipe like I did here. I think they run better using stock pipes.
http://www.diygokarts.com/vb/showthread.php?t=9403
I am going thru hell trying to get my belt right. I wish I did the above setup. I would never have to worry about it.
fowler
New member
i found an add for his engine asking $600 and anoughter asking 5
I wasn't saying you couldn't do it. Assuming that you are familiar with water craft, think about how you can easily pull a boat into a dock. How much does that boat weigh? Now, put that boat on dry land and try pulling it. Which was easier? Water provides so little moving resistance in comparison to dry land.
hotrodchevy83
Hotrodchevy83
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weigh bout 600lbs
fowler
New member
the boat
Now, go pull 600 lbs across dry land and try the same with it floating on water. This is why I don't think a jetski motor is the best option for the value of it. Sell it, get some cash, go buy a bike engine, and use the extra cash for kart parts.
CriticalMass
New member
I agree with the majority of posters here but not on the friction topic. An engine that boasts a certain hp and torque, that's what you are going to get at the PTO.
What I do agree with is the fact of cooling. Most all marine engines are designed to be cooled by fresh water constantly being pushed through the engine.
Even if you did fashion a pump and re-circulating system for the water, it will eventually get too hot and the engine will suffer.
I imagine if you do go through with this, you will only be able to run the kart for a short time. It will overheat eventually.
It's a sweet idea, but others are saying use a sled or street bike motor. You get the power you want, gearboxes, and the engines are designed for the application.
Do keep us updated though.
What I do agree with is the fact of cooling. Most all marine engines are designed to be cooled by fresh water constantly being pushed through the engine.
Even if you did fashion a pump and re-circulating system for the water, it will eventually get too hot and the engine will suffer.
I imagine if you do go through with this, you will only be able to run the kart for a short time. It will overheat eventually.
It's a sweet idea, but others are saying use a sled or street bike motor. You get the power you want, gearboxes, and the engines are designed for the application.
Do keep us updated though.
hotrodchevy83
Hotrodchevy83
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have electric fan and electric water pump
CriticalMass
New member
That is well and good, but the water will heat up eventually. It will heat up enough that it will affect the engines performance. When the ski is in water it's pulling cold water all the time, the water never heats up.
I don't think you grasp the cooling design behind the motors. That's why I said if you do make it work ie radiator and fan, you will only be able to run the motor for a short time before the water is too hot and the engine overheats.
Make sure you figure out what the optimum running temperature is for the motor.
I don't think you grasp the cooling design behind the motors. That's why I said if you do make it work ie radiator and fan, you will only be able to run the motor for a short time before the water is too hot and the engine overheats.
Make sure you figure out what the optimum running temperature is for the motor.
Doc Sprocket
*********
I think we're overthinking the cooling thing, and missing the obvious-
***THERMOSTAT***
Surely to god a thermostatic system can be employed here. I'm not familiar with the inner workings of a jetski engine here, but I find it very, VERY difficult to believe that a modern jetski engine simply inhales cold water and circulating it once, exhales. How could the engine possibly reach operating temperature? Running an engine cold all the time is not only inefficient, but downright damaging. So- that leaves two possibilities. One, that the original cooling system uses a thermostat to keep engine temps in check. Two, the system draws in the water, and has a small outlet- allowing the water to circulate around quite a bit without being constantly exchanged with COLD water.
If the former is true, the OP can continue to use the thermostatic system, and as long as the radiator and water pump are up to the task, shouldn't be a problem. If the second system is used, it might take a bit more fiddling to get right, but should still be doable.
Converting to a closed system may take some doing, but it shouldn't be Mission Impossible. Install a water temp gauge as soon as possible, and keep a really close eye in it until all the bugs are worked out.
You'd also be wise to adapt in a radiator with a pressure release cap, so that if the numbers get a bit high, you don't blow a hose. A small recovery tank would be a good plan, too.
By the way- I'm going to play Devil's Advocate for a minute here, regarding the whole boat VS car thing here, regarding HP, drag, etc.
First, HP is HP, torque is torque, and if the jetski engine develops, say, 65hp at 7000 rpm, that's PLENTY for a kart- think about it.
Second- efficiency. A propeller (or impeller on a jetski) nearly ALWAYS slips. There is no mechanical lock-up, as there would be between a kart engine and it's wheels. A propeller is like a clutch that is pretty much always slipping. Partially because of this, it takes a lot more hp and RPM to get a boat moving, and keep it moving.
Third- Drag. Until a boat gets up on plane, there is a significant amount of drag involved. Someone above compared pushing a car (or kart) on the ground, verses pushing a boat. I would suggest that pushing the boat is maybe a bit harder in comparison than you think.
***THERMOSTAT***
Surely to god a thermostatic system can be employed here. I'm not familiar with the inner workings of a jetski engine here, but I find it very, VERY difficult to believe that a modern jetski engine simply inhales cold water and circulating it once, exhales. How could the engine possibly reach operating temperature? Running an engine cold all the time is not only inefficient, but downright damaging. So- that leaves two possibilities. One, that the original cooling system uses a thermostat to keep engine temps in check. Two, the system draws in the water, and has a small outlet- allowing the water to circulate around quite a bit without being constantly exchanged with COLD water.
If the former is true, the OP can continue to use the thermostatic system, and as long as the radiator and water pump are up to the task, shouldn't be a problem. If the second system is used, it might take a bit more fiddling to get right, but should still be doable.
Converting to a closed system may take some doing, but it shouldn't be Mission Impossible. Install a water temp gauge as soon as possible, and keep a really close eye in it until all the bugs are worked out.
You'd also be wise to adapt in a radiator with a pressure release cap, so that if the numbers get a bit high, you don't blow a hose. A small recovery tank would be a good plan, too.
By the way- I'm going to play Devil's Advocate for a minute here, regarding the whole boat VS car thing here, regarding HP, drag, etc.
First, HP is HP, torque is torque, and if the jetski engine develops, say, 65hp at 7000 rpm, that's PLENTY for a kart- think about it.
Second- efficiency. A propeller (or impeller on a jetski) nearly ALWAYS slips. There is no mechanical lock-up, as there would be between a kart engine and it's wheels. A propeller is like a clutch that is pretty much always slipping. Partially because of this, it takes a lot more hp and RPM to get a boat moving, and keep it moving.
Third- Drag. Until a boat gets up on plane, there is a significant amount of drag involved. Someone above compared pushing a car (or kart) on the ground, verses pushing a boat. I would suggest that pushing the boat is maybe a bit harder in comparison than you think.
CriticalMass
New member
http://www.minibuggy.net/forum/motor-engine/6807-jetski-engine-buggy-oops-gotta-pc-here-pwc.html
Here's another thread on the same topic. A jetski motor is designed and built to have cold water flowing through it constantly. The water jacket surrounding the pistons is most likely smaller as to reduce the size of the motor. these motors get HOT and need to be rapidly cooled.
Now these guys seem to think it's doable with a big enough radiator surface coupled with a pump that can handle the flow.
Without digging much deeper into the issue it seems it would be more trouble then it's worth.
It looks like it can be done, just alot of work.
Here's another thread on the same topic. A jetski motor is designed and built to have cold water flowing through it constantly. The water jacket surrounding the pistons is most likely smaller as to reduce the size of the motor. these motors get HOT and need to be rapidly cooled.
Now these guys seem to think it's doable with a big enough radiator surface coupled with a pump that can handle the flow.
Without digging much deeper into the issue it seems it would be more trouble then it's worth.
It looks like it can be done, just alot of work.
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