Like Tree0Likes

Why run HP500's so cool?

Old 08-18-2003, 02:30 PM
Thread Starter
jbrauer's Avatar
Join Date: Sep 2001
Location: Nashville, TN
My Boats: 2003 Spectre 36' Poker Run
Posts: 567
Default 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.

jbrauer is offline  
Reply With Quote
Old 08-18-2003, 02:40 PM
Charter Member
Charter Member
Dean Ferry's Avatar
Join Date: Nov 2000
Location: Merritt Is. Fl. USA
My Boats: 2006 Hustler 388, 2004 Hustler Talon 25, 1999 30 Spectre cat and 2007 21' hydrostream voyager w/ Merc. 225 EFI
Posts: 6,580

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 $$
Dean Ferry is offline  
Reply With Quote
Old 08-18-2003, 02:46 PM
Forum Regulator
VIP Member
Trade Score: (1)
Sydwayz's Avatar
Join Date: May 2001
Location: Worldwide
My Boats: 17' Speedliner Cat & O.P.B.
Posts: 21,920

Got me, mine runs damn cool too. 500EFI. T-stat is a 160.
Sydwayz is offline  
Reply With Quote
Old 08-18-2003, 03:32 PM
bajadude's Avatar
Join Date: Apr 2002
Location: Boca Raton, FL
My Boats: 340 Sundancer with 8.1s, formerly 1999 33 Outlaw HP500s
Posts: 708


Mine run around 140 - 150 as well.
bajadude is offline  
Reply With Quote
Old 08-18-2003, 03:41 PM
Mad Hatter
Posts: n/a

Its a boat, so its cause we can. Less temp more power less knock. Is this reputable engine builder experienced in boat motors?
Reply With Quote
Old 08-18-2003, 04:17 PM
VIP Member
VIP Member
Join Date: Nov 2002
Location: ankeny,ia.
Posts: 3,449

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*.

JaayTeee is offline  
Reply With Quote
Old 08-18-2003, 08:13 PM
Charter Member
Charter Member
fastedy's Avatar
Join Date: Oct 2000
Location: richmond virginia
My Boats: 2003 34' SUPERBOAT Special, 2001 30'SUPERBOAT Y2K, 2001 YAMAHA JET BOAT, 1974 REGATTA JET BOAT
Posts: 1,348

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
fastedy is offline  
Reply With Quote
Old 08-18-2003, 09:35 PM
Join Date: Feb 2002
Location: Honeoye, NY
My Boats: '77 Martini 7 Meter
Posts: 763

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
jpclear is offline  
Reply With Quote

Related Topics
Thread Starter
Last Post
General Q & A
10-09-2008 05:05 PM
Double R Performance
General Boating Discussion
09-01-2008 01:59 PM
General Q & A
08-08-2007 06:20 PM
05-23-2007 09:09 PM
General Q & A
08-11-2006 07:17 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 01:18 AM.

Copyright 2011 OffShoreOnly. All rights reserved.