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Thread: T-stat what is everyone using?

  1. #1
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    T-stat what is everyone using?

    I have a 165 degree t-stat installed the motor runs at a tad under 170 and after hard runs a tad over 170 probably 180-190 is that too high or is it okay ford 5.0 ho

    my 16 had no t-stat and ran 140 and after hard runs would jump to 200 then drop back down to 140 after some time at idle
    When the sky is grey,look out to sea.
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  2. #2
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    I use a 140* thermostat because I run in salt water and have been told that above that the salt acts badly with the iron. After a hard run, it'll get to maybe 160* for less than a minute as the thermostat adjusts for the lower water flow.
    Maddy's Daddy
    L.I.,N.Y.

  3. #3
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    "in the day" most all older marine engines used~
    160* in fresh water
    140* in salt water

    Your 165* T-stat seems to be running slightly high~~~But these things are not very accurate anyway.

    I usually test new T-stat units in a pan of water on the stove with a candy thermometer beore installing them .

    The Robertshaw units seem to flow much more water than the Stant brand T-stats as they have a wider valve opening and thus seem to keep engine temps from spiking when slowing down after a hard run.

    Matty~
    Your 165* T-stat should be OK in the old Ford.
    Last edited by silverghost; 08-26-2012 at 11:45 AM.
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  4. #4
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    Matty, my '92 302HO always runs 125 degrees at no wake speed, 125 deg for early Spring cruising (colder lake temp), 130 deg during Summer cruising and 135-140 deg after a hard WOT run. Then returns to normal soon after. I havent replaced the t-stat yet so I don't know it's rating.

    This winter I'm installing a 160 deg EMP Stewart t-stat predrilled with 3 bypass holes (so there is always some waterflow and less changes in the cooling system temp).

    HTH, John C
    '
    92 Sweet 16 302 Ford
    Windshields are for Sissies!!!

  5. #5
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    '
    92 Sweet 16 302 Ford
    Windshields are for Sissies!!!

  6. #6
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    gonna see how it runs up in lk george much different water temps up there .
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

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