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  1. #1

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    Riva open loop cooling issues in colder waters (CT)

    I have the open loop cooling for my setup and I am having issues in colder water in CT. I cannot get the engine up to temp unless I go WOT. It will get close and then as soon as I start cruising again, it drops down in the 120-130* range..and this is in June. In the colder months, I can't get it to stay above 110*. I have contacted Riva a few times about this and they have no answers. I don't feel comfortable operating my beautifully built EastSide engine at those temps. Also, I am running the smallest washers at the pump and in the thermostat housing. The only way I am able to get the ski up to operating temp is adding a manual bleed off valve at the intercooler and operating it by hand constantly to get something close to normal temps. Any ideas?


  2. #2
    Cosmicbrut's Avatar
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    Is your ski a 260 or 300?

  3. #3
    Make a restricter for the thermostat dump. Say it's a 3/4 hose get a 3/4x5/8 or 3/4x1/2 barb and stick it in the hose

  4. #4

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    Quote Originally Posted by Cosmicbrut View Post
    Is your ski a 260 or 300?
    300

    Quote Originally Posted by 01xp View Post
    Make a restricter for the thermostat dump. Say it's a 3/4 hose get a 3/4x5/8 or 3/4x1/2 barb and stick it in the hose
    Will this cause a pressure build up issue?

  5. #5
    Cosmicbrut's Avatar
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    Had to ask because the 300 routing is different from the 260. Reducing the outlet will help. You could also bypass the oil cooler. I dont run water through mine in the cooler months being the engine has trouble getting up to temp.

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  7. #6

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    I see the fizzle cooler has a dedicated dump line. Maybe I can run that as well to help keep the temps up. 3/4" will be too much and it will over heat the engine, but if I can maybe take it down to 1/2" to limit flow to the engine, it could help with temps.

  8. #7
    WICKEDSEADOO's Avatar
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    Quote Originally Posted by Snyper View Post
    I have the open loop cooling for my setup and I am having issues in colder water in CT. I cannot get the engine up to temp unless I go WOT. It will get close and then as soon as I start cruising again, it drops down in the 120-130* range..and this is in June. In the colder months, I can't get it to stay above 110*. I have contacted Riva a few times about this and they have no answers. I don't feel comfortable operating my beautifully built EastSide engine at those temps. Also, I am running the smallest washers at the pump and in the thermostat housing. The only way I am able to get the ski up to operating temp is adding a manual bleed off valve at the intercooler and operating it by hand constantly to get something close to normal temps. Any ideas?
    i put a thermostat im my rxp, it runs perfect. Riva washers suck ass.

  9. #8

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    Quote Originally Posted by WICKEDSEADOO View Post
    i put a thermostat im my rxp, it runs perfect. Riva washers suck ass.
    can you DM me the routing?

  10. #9

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    Send me an email tomespo3663@yahoo.com I can explain. I got rid of the washer setup as well.
    Quote Originally Posted by Snyper View Post
    can you DM me the routing?

  11. #10
    raiderx72's Avatar
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    Ran open loop for years in CT but with thermostats. If your not running one that's more then likely your issue.

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