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  1. #1
    Newbie
    Join Date
    Nov 2016
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    Lake Macquarie
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    5

    Default Jabsco water pumps

    Hi guys I have a 350chev mid mount with a dog clutch

    it had two water pumps on it one running a raw water system and one running a closed cooling system thru a heat exchange
    it was a very messy setup it had no thermostat and ran hot all the time

    im going back to basics and running a full raw water system with a thermo control kit

    I'm wondering which pump would be best to run

    one is a 52080-2001 with a 6" pulley
    and a 52040-2001 with a 4.5" pulley

  2. #2
    Senior Member
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    Jul 2009
    Location
    Brisbane
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    Default

    There could be a number of reasons why it's over heating with the current setup.
    What raw water pump does it have now? There should be no reason why you can't reuse it (unless it's worn out) and replumb for a thermo control.
    Jabsco is not my pick...
    3/4 Fynspray with a 5" pulley is by far the most common for a 350 Chev mid mount.

    Fynspray Water Pump 3/4" NEW DESIGN | Cassell Marine

    https://www.ebay.com.au/itm/252332928142
    Last edited by ski351; 08-01-2017 at 11:58 PM.

  3. #3
    Newbie
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    Nov 2016
    Location
    Hawkesbury, NSW
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    Default

    I would go the Fynspray if I could. They are cheaper and easier to service.
    I had to put a Jabsco on due to space last year and it's fine though.
    Are the pumps currently fitted in good condition ?
    Have you checked the impellers?
    Is the closed system serviced correctly?
    I would have thought the system should already have a thermostat in it.
    2000 Skiline Spirit 350SBC.
    Euro cars.

  4. #4
    Newbie
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    Nov 2016
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    Lake Macquarie
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    Default

    Thanks for the input
    I have removed all cooling systems and am awaiting the new thermo control kit to install and connect a full raw water system

    I have done a little more research on the two pumps I have
    What I'm now asking is how many litres a min would be need from the pump to supply the amount of water needed
    I have a 40lt a min and an 80lt a min would the 40lt a min do the job or would I need to use the bigger one

  5. #5
    Senior Member
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    Jul 2009
    Location
    Brisbane
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    Default

    Click on the Cassel Marine link I posted above. There is a chart showing flow rates ... litres/minute vs pump RPM
    Work out the crank and pump pulley diameters you are going to use to get the under drive ratio
    40L/min should be adequate

  6. #6
    Newbie
    Join Date
    Nov 2016
    Location
    Hawkesbury, NSW
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    Default

    I'll have a look tonight and see if I can find which pump I got last year for my SBC.
    I got it from Cassells as per the link posted by ski351. If your unsure, you could always ring them.
    2000 Skiline Spirit 350SBC.
    Euro cars.

  7. #7
    Newbie
    Join Date
    Nov 2016
    Location
    Hawkesbury, NSW
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    19

    Default

    I have a Jabsco 52040 pump with Rolco UFO pulley on it.
    The thermostat housing is a 4 port unit that bolts onto the std inlet thermostat location.
    With a new thermostat the engine temp is perfect.
    2000 Skiline Spirit 350SBC.
    Euro cars.

  8. #8
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    Nov 2016
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    Lake Macquarie
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    Default

    Thanks
    My new thermo kit arrived yesterday so it's all fitted I just have to change a few bolts to stainless the ones they supplied were not
    Then get the hoses hooked back up and run it ...... ��

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