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  1. #1
    Registered jbrauer's Avatar
    My Boats:
    2003 Spectre 36' Poker Run
    Join Date
    Sep 2001
    Nashville, TN

    Why run HP500's so cool?

    I'm in the process of going through one of my HP500 carb motors. It appears that the previous shop left some trash in the block that worked it way to a couple rod bearings! #$%$#*&^%#!!!

    Any way I now have a very reputable motor builder doing the work and he asked why run the motor with a 140 degree thermostat? He was concerned about burning off the condensation in the motor if it runs so cool.


  2. #2
    Charter Member Charter Member Dean Ferry's Avatar
    My Boats:
    2006 Hustler 388, 2004 Hustler Talon 25, 1999 30 Spectre cat and 2007 21' hydrostream voyager w/ Merc. 225 EFI
    Join Date
    Nov 2000
    Merritt Is. Fl. USA
    I'm not usre what the T-stat temp range is suppose to be in a stock Hp 500, BUT I changed my water pump impeller this year and my 1999 HP 500 and it idles @ 125 Deg. and ~150 after WOT. On average it runs about 140 Deg.
    Everything is for sale @ a certain $$

  3. #3
    Forum Regulator VIP Member Sydwayz's Avatar
    My Boats:
    37' Active Thunder AVH; 17' Speedliner Cat OB
    Join Date
    May 2001
    Got me, mine runs damn cool too. 500EFI. T-stat is a 160.

  4. #4
    Registered bajadude's Avatar
    My Boats:
    340 Sundancer with 8.1s, formerly 1999 33 Outlaw HP500s
    Join Date
    Apr 2002
    Boca Raton, FL

    Mine run around 140 - 150 as well.

  5. #5
    Mad Hatter
    Its a boat, so its cause we can. Less temp more power less knock. Is this reputable engine builder experienced in boat motors?

  6. #6
    VIP Member VIP Member JaayTeee's Avatar
    My Boats:
    2002 baja 33 o/l 575sci's
    Join Date
    Nov 2002
    mine run between 150*-160*

    The 96' and newer 500's have
    oil cooler thermostats,
    the oil cooler is bypassed til
    oil temp reaches 210*.


  7. #7
    Charter Member Charter Member fastedy's Avatar
    My Boats:
    2003 34' SUPERBOAT Special, 2001 30'SUPERBOAT Y2K, 2001 YAMAHA JET BOAT, 1974 REGATTA JET BOAT
    Join Date
    Oct 2000
    richmond virginia
    I tried differnt T-stats on the dyno with my 500efi, ran best at 140*
    "If Things Seem Under Control, You're Not Going Fast Enough"
    Mario Andretti

  8. #8
    My Boats:
    '77 Martini 7 Meter
    Join Date
    Feb 2002
    Honeoye, NY
    The condensation thing has a LITTLE something to do with water temp. and a LOT with oil temp. The cooler you can run the water and keep the oil at 220*F. the better. I had to go to the 160* water thermostat to maintain the 200*+ oil temp. --- Jer

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