The cheap jet boat and the outboard powered jet ski make their first trip on the water!
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- Опубликовано: 8 сен 2024
- This week is our first test drive of the boats we built for just over $1k in just a few weeks. This was our test run before we embark on the trip to Peel island!
Love the builds! The jet could definitely use way more prop. Considering the torque that 6 cyl makes, you could step the prop way up and get better speed and lower rpms.
The props in those jet units are already pretty good, a 2:1 ratio would suit it better as that jet unit is meant to run at around 7k rpm or higher
On the pontoons weld a flat plate that sticks out like 4 inches on top front of the pontoon that's wider than the Pontoon as a splash plate. Kinda like a solid mud flap. On that old inline six. I would take out the thermostat and let the water to just flow straight through. That should help with cooling. Also on that straight six I'd put like a CVT drive on it. Kind of like a snow machine or side by side. So that way it'll move the jet drive faster than the RPMs of the engine when cruising. You can also adjust the spring and weights of a CVT so you can have it at Max gearing at like 2500 RPMs. Maybe you can find a wrecked side by side to steal the CVT drive off of. Also you may need a steeper pitch on the impeller.
Boats have different power requirements than cars; upshifting while cruising will only overload the engine and make the overtemp issue worse. While a 3000 lb. car may only require 20 or so HP to maintain 75 MPH on level ground, a 3000 lb. boat would require 300-400 HP to do the same speed. Consider too, that water is about 800 times more dense than air, so it's going to produce around 800 times more drag on the wetted surface than if it were a car driving down the road.
I digress. To "change gears" in a boat, you need to change the prop/impeller. Under certain very special circumstances, a multi-speed transmission works in a boat, but that clapped out shit heap is far, far from any of them. There's also a ton of other factors in play here... poor pump design (note all the aerated water behind it and the leaks at the transom), mismatched impeller to the engine, overweight and underpowered engine, not enough RPMs, ect...
It was a fun project I'm sure, but that thing needs so much revision to be improved, they're better off starting with a clean slate.
T in a water inlet into the exhaust and extend it’ll help keep temps down also if you can find a steeper pitch impeller it’ll help a lot they can be pretty cheap
Impeller is also quite sensitive to gap, efficiency goes up is it fits 🤓
I was thinking it could do with an overdrive box in there to spin the jet drive faster, the old Holden 6 just doesn't rev near hard enough
New wear ring in jet unit, should only just be able to get a sheet of paper between the impeller and the wear ring, any more it will cavitate.
Look like a blast to drive.
Way more savage Pitch on the Jet or Spin it at double speed with a gearing setup. I thought that would be an issue. The jet ski motors turn much higher RPM than an Old Holden 6 But you do have the advantage of torque. If you could find a 1:2 gearbox you'd be laughing or use a chain and sprockets. Great Job on both fellas. Few modifications and tweaks and You'll be right. If that Island is 50-80Km out, you are going to need a fair bit more fuel I think.
Another pissa episode, bloody love the Aussie ingenuity!
Hey Gibbo, what’s worse then lobsters on your piano? Crabs on ya organ 🤣🤣🤣🤣
Well done guys excellent work great welding skills there nice work.
Love ya work guys..... Really been looking forward to seeing them in the water!🤣😁😎 absolute gold!👍🍺😁😁😁Keep up the good work... How good!
How long until you slap a turbo on that red motor 😂
thanks for sharing this video of your projects fellas. Really enjoyed it.
And ya must be doing something right, because they stayed afloat 👍
Good fun.
Ha ha that was hilarious I love it! Fab up some water deflectors on the front of the pods & make them pointy to cut through the water better
Really wicked job lads so glad I found this channel! Maybe experiment with different pitch impellers which is basically like changing diff gears and tyre size.
either way can't wait to see more on the projects when budget allows keep it up boys 👏
I like the low budget - that makes it more interesting with low cost builds, where it is more skills and having fun for a little money - thats a big win 💪🤓
You guys do lovely work.
That is some insane fab and welds going on 🤙
Jet drive impeller with much higher pitch will get the rowboat up on plane easier. Also put a ride plate under the Jet drive. The Jetski pontoons need a splash shield from lower front edge up an along the boat hull.
Goes great, I got set back on a few things on my boat but hopefull I can finish it soon
my brother's from down under love those freaken boats!! you all are freaken crazy!🤣 watching from missoura us! you all stay safe! there's alot of crazy shit going on all over!!😉🖖
Congrats on not sinking ..👍👍👍👍
for the boat. maybe slapping a plastic or alloy fin/paddle that clamps around the jet nozzle and points down would increase steering authority at low speed.
Great job on both least you didnt sink great stuff Aussie Aussie Aussie hoy hoy hoy 🇦🇺🇦🇺🤝🇦🇺🇦🇺😎🙂👍🍻🍻 cheers KC 🇦🇺🇦🇺
Someones already mentioned a scoop on the inlet for the reds cooling water but also needs the telltale moved over to the drivers side so you can just put your right hand over the edge while driving to feel if its pumping and what the temp is.
Always wanted to whip up a mini “speed” boat I called it as a kid haha!
Pretty much exactly what I invisioned making, love it boys.
Sounds like the 202 needs an accelerator pump
You definitely need to rtv seal the pump assembly against the transom to prevent the leaks you have.
Needs a scoop on the water intake to help get water into the pump and a rubber impellor type pump instead of the SBC one.
Proper impellor pumps can generate anywher from 20-70psi, easy enuf to push cooling water thru a 186. Plus they can suck the water up while engine is just idling.
Savage she make them they’d be an awesome boat. 👍
Better than Finnegan’s Garage hahaha 🤣
If it sits, it ships!
See you on Peel boys! 🍻🤣
Impressive fab work. For the cooling on the jet boat, why not just tap into the jet pump for your water supply? Rather than running the electric water pump.
Mate , Cleeter can keep his mini jet boats , I’ll have a “Savden” thanks 👌🏻
I reckon lift the pontoons a couple inches, tilt the front up a little and a point on the front. They should be awesome then I reckon.
Awesome 👍
put a screen before the waterpump dont want to suck up some leaves
There is something wrong in the alignment in the Jet engine, they should put a trust bearing at the end of the impeller shaft. it would have been more faster.
Might need a 2 speed box
So blind garage challenge can the blind man ski behind your boats what do you reckon guys who wants to see that video great job on the boats boys when you guys taking me fishing haha
Yeah thats worth a subscribe.
You have half of it done already ... build a jackshaft and put a gear advantage via chain or belts! Start at 2:1 your steering will imorove with more water volume out of the nozzle
Aaaaaa the song of the majestic red motor
an old mountain bike gear set and chain should do trick
Awesome builds, asking a red motor for RPM though...
You need an old Mazda 1300 engine....will rev at 8-9000rpm all day
Oh yeah, and that jet unit is meant to run at 6-8k rpm, so you can either find a gearbox that has a 2:1 ratio or you can try a sprocket and chain method
The jet needs gearing so the engine don' t have to rev so hard, and the pontoons can't have that angle in the front.
Other than that, great job guys..!!
Is that a 235 Chevy straight 6?
Its a holden 202
WHAT!!! I scooter around this lake with my daughter. Ever time I’ve gone past this boat ramp I thought it looked like where you go. Why’d I think you’re in brissy?
Down in Mexico 🇲🇽 if you’ve read the signs lol
@@motorfab 🤣🤣🤣