goatmilk66
Member
I am building 1860 aluminum boat with 2012 RXT 260.need input on how to cool without ride plate.heat exchanger would be my guess,but how can I get water off of my pump to circulate through raw side?
-
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.
cooling seadoo 260 in jon boat
- Thread starter goatmilk66
- Start date
- Status
You could eliminate the ride plate system and get a raw water (the water you are sitting in) feed from the pump, much like the 2-strokes do. Or, you could feed a heat exchanger via the raw water and still keep a closed loop system. Larger boats use the heat exchanger system quite often.
goatmilk66
Member
where do I pick up water from pump to keep closed loop?,and how to return water to river would solve my issue.i like heat exchanger idea.
I would have to look at a 2-stroke hull to see where the raw water feeds the engine. The 4-tecs may have something as well, but I don't know why off hand due to the closed-loop system. As far as dumping the water goes, you could easily do a through hull fitting and or dump it out the existing exhaust.
[MENTION=31048]LouDoo[/MENTION] or [MENTION=41828]Minnetonka4me[/MENTION] can likely give you some guidance.
Sounds like a neat project, you might wind up with the fastest boat on the lake, certainly the fastest jon boat. Maybe a little scary but fun.
Reading your post, I'm wondering if you could use the hull of the boat itself as a heat exchanger, maybe simply bolting the existing ride plate to the inside of the hull. Or maybe just use a small radiator from a water cooled motorcycle or a small car. Honestly I've not heard of a project like this so I'm just throwing out some ideas. A guy in TN put a 2-stroke rotax in an jon boat.
To answer your question a 2-stroke Seadoo intakes water from the jet pump and exhausts most through the exhaust.
Lou
Reading your post, I'm wondering if you could use the hull of the boat itself as a heat exchanger, maybe simply bolting the existing ride plate to the inside of the hull. Or maybe just use a small radiator from a water cooled motorcycle or a small car. Honestly I've not heard of a project like this so I'm just throwing out some ideas. A guy in TN put a 2-stroke rotax in an jon boat.
To answer your question a 2-stroke Seadoo intakes water from the jet pump and exhausts most through the exhaust.
Lou
Attachments
Last edited by a moderator:
Bolting the heat exchanger to the hull would work I believe. The key would to make certain that it fits perfectly flat against the hull. This is assuming you are using a metal hull.. The heat removal may be slightly less efficient than if it was touching the water itself, but if it does fit perfectly against the hull, I would think it would do a pretty good job. If you could not get it to fit perfectly, then I would design a sealable box that you would put water into and then have the riding plate within the water. It would act as an efficient means to pull the heat as the water within the box would be against the hull and the hull would cool the water, which would draw the heat from the riiding plate.
goatmilk66
Member
it is a 1503 4-stroke ,I know raw water runs to the intercooler and then to exhaust.i just don't know if there is enough to tee off and go through heat exchanger also.attaching ride plate to hull is good idea,but I have UHMW plastic 1/2" on bottom of boat for rock impact,and lots of bracing inside of hull.
goatmilk66
Member
good idea!,i am looking at all ideas that are out there.there is a boat build on u-tube that has 215hp rotax with ride plate attached to boat bottom,i would like to ask him about controls and steering that he used but I see no way to contact him.i have seen seadoo with 30 plate heat exchanger onboard also,but no info on how to connect.
Ok,,, I would keep the ride plate but mount it outside the hull but like a trim tab. If it can not be mounted out the back center, then get another one and mount one on the let and one on the right. They can act like trim tabs. Only one would need to be functional for the cooling purposes.
wfo speedracer
Active Member
Also there are some raw water setups available for the 4 tecs,a few other forums have many threads on this subject, you will need to join to see the pictures, I would post a link to the site but apparently I cannot do that here, sorry. Feel free to PM me for a link that will put you in the right direction.
Here is a link to such a kit :
http://www.pwcmuscle.com/riva-sea-doo-4-tec-open-loop-cooling-kit.html
Here is a link to such a kit :
http://www.pwcmuscle.com/riva-sea-doo-4-tec-open-loop-cooling-kit.html
Last edited by a moderator:
xintersecty
New Member
I think there is plenty of raw water from the pump. Personally I lean towards heat exchanger idea. You need to start posting pictures of the work done.
goatmilk66
Member
that is what I want to do,try not to change any more than what I have too.just don't know if I need to run water through hull or exhaust.where to tee off is still up in air,like before or after intercooler.what exactly does intercooler cool?
It cools the incoming air to make it more dense. So for sure after the IC, not before it.
goatmilk66
Member
you guys are great help,thanks a lot!!!
wfo speedracer
Active Member
I think the box idea may be the best route if you are not wanting to change stuff around, there is plenty of water at the pump so much so that Seadoo puts a restrictor in the exhaust cooling port on the pump, you could probably remove the restrictor then tee off there and go into a box containing the stock rideplate and still have plenty of water to cool the exhaust.
goatmilk66
Member
I will post pics. as I get close to completing.
Nike12000
Active Member
a youtube video would be even better!
goatmilk66
Member
how much gpm flow runs through closed loop?
IDoSeaDoo
Well-Known Member
Do what I'm doing: I'm putting a 4tec into an old Challenger and using a 30 plate water to water heat exchanger. I tried a tube exchanger, and it wan't enough. You'd have to get a massive one to cool that engine. I can guarantee that the plate exchanger works great on the bench, and others have used it in their skis w/o issue. I haven't tested it on the water, but have 0 doubt about it. The BTU calculation checks out. Look up the thread Challenger 4tec Upgrade for more details, I was messing with this part of the project like a year ago or something.
goatmilk66
Member
thanks for info,i ordered 30 plate heat exchanger sunday.your reply makes me feel good about decision on purchase.may need strainer to keep trash out of the small passages.
xintersecty
New Member
In my boat repair thread, I go over strainers. Every once a while, I empty my strainer and find just light sand in there.
- Status
