rhino jet jon

[brianb2247]

Back of boat cut out for bolt in jet pump all I have to do is trim and file alittle metal and drill holes

 

[brianb2247]

6 11/16 wide by19 11/16 long across the back it is6 11/16 by 6 11/16 trim the back support alittle using marine atwood poly sealant adhesive

 

[brianb2247]

The 640 motor is built

 

[Jim]

Awesome! Looking forward to more progress.

 

[Ranchero50]

Looks good. I am surprised they didn't fit and mount the pump for you, then add some bracing at the bottom. When the hull deflect I suspect the pump will shift which is hard on the flange couplings. Hopefully you won't have any problems.

 

[71Fish]

smackdaddy53 » 16 Aug 2014, 21:12[/url]"]

PSG-1 » 03 Aug 2014, 14:39[/url]"]I can't say how weight affects the performance of an outboard jet, but I can definitely tell you that it has an effect on an inboard jet or a PWC. As shown above, .125" sheet weighs more per square foot than .090" or .100" For an engine under 700cc, if you're using thick material for the hull, then it needs to be a short boat, like one of those New Zealand style jets. A 14 ft boat means more surface area, and more resistance.

I get that .125 aluminum weighs more than .090 or .100, and total boat weight affects boat performance. I agree there are better choices of power, however the poster asked about the TS640.

PSG-1 » 03 Aug 2014,[/url]"]First rule is that you don't want to over-lug these engines.

My point is simply this: The engine will not lug because the boat weighs more. The TS640 will spin the pump the same whether the hull weighs 400 or 800 pounds.

Dude, if you think ranchero and psg don't have any weight on the quesion at hand you are wrong. I would second guess myself if they told me I was wrong. They are "real world" jet heads, not hypothetical ones.

I meant no disrespect to anyone. I simply stated fact. If the term "lug" refers to over-rev, I give merit to PSG's reply. Hopefully some day I will be a real world jet head, for now I can only dream.

 

[brianb2247]

After I fit the pump and motor reinforcement brackets and plates will be welded in

 

[71Fish]

Is the bottom smooth?

Edit: Never mind, I see heat tracks where the bottom is probably straked.

 

[smackdaddy53]

I sent you a pm brian

 

[brianb2247]

Still figuring the layout heres the console set as side console who thinks it looks good or should I convert it to center console or should I ditch the console and and make it stick steering

 

[amk]

brianb2247 » 16 Aug 2014, 23:52[/url]"]Not really worried about performance buddy of mine has a .100 1448 welded with a 1995 tigershark montego 640 which is 60 hp I way 250 he weighs 225 boat weighed 450 acooler full food and drinks,5 fishing poles trolling motor and battery, one tackle box 37 mph gps comes out of the hole very nice thinking the boat is a little bigger yet more hp stock than his it hypothetically should perform.

wow that's pretty good my jet boat I got has a 1648 alumacraft with a 650cc Yamaha and It only gets 30 mph empty. Maybe im not getting all the power I should be getting. Your build looks awesome keep posting.

 

[amk]

it kinda looks like you need to move the console forward some. Also I have no idea of the conditions you run but on my river my center console being up high so I can stand/lean when I drive is crucial. Theres a lot of situations where I need the higher view point to see rocks and shallow spots.

 

[brianb2247]

Like the idea doing center console moee foreward and higher so you can stand and see better . I was working on the boat some more and was wondering if any one had pics of how they mounted their engine to the boat

 

[71Fish]

https://www.nzjetboating.com

 

[brianb2247]

went ahead and read over all the posts to this post and come to the question of how are trhese guys adapting their jet pumps with different motors because id like to use a sea doo engine if mine lacks power.

 

[PSG-1]

brianb2247 » Yesterday, 18:09[/url]"]went ahead and read over all the posts to this post and come to the question of how are trhese guys adapting their jet pumps with different motors because id like to use a sea doo engine if mine lacks power.

Spartan Jaw Coupler works well. This is what they use in most Yamaha and Kawasaki jet skis.
You will have to drill & thread one half to fit the PTO threads on the back of the engine, and then you'll need to drill & thread the other half to correspond with threads on your driveshaft, which you will probably also have to cut (this is why having your own welding and machining equipment is about the only way you can afford to build a jet boat)

This is how I connected my engine and pump. Ran it for several hundred hours like that with the 2 stroke, and with the 4 stroke, I've been running it for the last 250 hours or so, no issues.

 

[brianb2247]

Jet pump installed

 

[smackdaddy53]

Nice and clean!

 

[brianb2247]

Engine mounts welded in holes all drilled every thing laser straight gonna box in the motor mount to be sure no flexing, gotta pick up hard ware tomarrow

 

[Ranchero50]

Looks good, just remember accessibility will either save you or ruin your build when something dumb happens and you really need to get in there. I made the section of deck that my rear seat post attaches to unboltable from the frame to access the motor better. That's one of my biggest fears about putting carpet in, I'll bury my screws in the carpet pile.