Greg: operating temperature and water pressure questions.
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Greg: operating temperature and water pressure questions.

  1. #1
    Junior Member
    Join Date
    Dec 2013
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    Default Greg: operating temperature and water pressure questions.

    Greg,
    first, this is the 2007 gullwing that had the bow opened up with the white interior and motor cover. Thanks for your help and information.
    Questions:
    1. The operating temperature is around 100 as per the temp gauge. I have read that it should be up around 140 to 160. Do you recommend these temps and if so how can we make this happen?

    2. What water pressure should be going through the motor and pipes? Again I have seen that it should be around 12 to 14 psi. Do you recommend this pressure and if so should we install a gauge and make the adjustment?

    Thanks again for your help.
    Alan

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  3. #2
    Senior Member
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    Dec 2007
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    Default Water Temp

    Alan, During the winter I would be surprised if the gauge even moves because the water is so cold. All the years I have been running a jet boat I've always ran it as cold as I could get it. The main reason is that a cold engine is going to make more power. I've seen this time and time again when we run an engine on the dyno,as soon as we let the temperature go up we see a loss of power. NHRA Pro stock cars actually have chillers so the can bring the engine temp down way low and run a O weight oil. These cars after burnout and staging will leave the starting line at 100 degree's or slightly more. Besure you give the engine enough time to obtain proper oil temp and that would be your only concern. On a stock jet drive you will feed the engine with a 5/8 water hose and dump with 2 5/8 hose's , I have never installed a water pressure gauge on the engine , but on the race boat we do regulate the water temp to 15 lbs. Not sure what it would be on a stock jet drive. There are thousands of jets running the same plumbing set up and I have not seen any problems.

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