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GT40 water t-stat |
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Canuck-Surfer 
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Joined: September-14-2019 Location: Ontario, Canada Status: Offline Points: 222 |
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 Topic: GT40 water t-statPosted: September-13-2020 at 4:09pm |
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During my GT40 rebuild on my 96 Sport, we left the previous t-Stat on the engine. In running it For first time last week, it appears the T-stat is a 143 F model. I have a new 160 in the box but my mechanic suggests I leave the 143 in since I will run her hard sometimes boarding and surfing with ballast.
Thoughts? What are the pros and cons of leaving the 143 in? And why were there two different thermostat options for this engine? |
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1996 Sport Nautique GT40 EFI
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: September-13-2020 at 4:22pm |
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There aren't 2 the 160 is what is called for by PCM for their fuel injected raw water cooled engines. But if you think your mechanic knows more about PCMs engineering- most likely with Fords engineering help as well,then by all means follow what your guy recommends. ;)
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DVskier
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Joined: September-04-2014 Location: Seneca SC Status: Offline Points: 449 |
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Posted: September-13-2020 at 9:04pm |
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Fuel injected PCM engines are 160 thermostat. End of story.
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2979 |
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Posted: September-13-2020 at 11:47pm |
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PCM says 160 degree T-stat for EFI engines and 143 degree T-stat for carburetor engines. However, you can run a carby 351W with a 160 Degree T-stat. I did for several years. Performance was outstanding. I saw no reason to go to a 143 Degree as I was only in fresh water.
JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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Canuck-Surfer
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Joined: September-14-2019 Location: Ontario, Canada Status: Offline Points: 222 |
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Posted: September-20-2020 at 11:50am |
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Thanks for the feedback guys. I'm actually not sure that the 143 tstat is installed. Now my temp gauge only stays at 120 or a hairline above. I have ordered an infared temp gun. I am also checking the temp sender switch.
Since posting I've found all the other threads about the GT40 t-stat. I'm learning a lot with this engine, its been a lot of fun. One thing I have seen asked but not answered anywhere (that I can find) is why do saltwater engines need a cooler temp?
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1996 Sport Nautique GT40 EFI
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: September-20-2020 at 12:10pm |
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I don't know the chemistry behind it but have heard it's something about the salt crystalizing at higher temperatures.
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malibud
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Joined: July-08-2009 Location: north carolina Status: Offline Points: 613 |
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Posted: September-23-2020 at 6:50am |
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Off subject but do you having any pictures of your balast set up ? how much weight? what is the surf like . I was planning on it for a winter project. thanks
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Canuck-Surfer
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Joined: September-14-2019 Location: Ontario, Canada Status: Offline Points: 222 |
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Posted: September-23-2020 at 7:31am |
Haven’t gotten that far in the restoration. Will likely use fatsacs. Not much room in a 90’s sport for built in ballast! |
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1996 Sport Nautique GT40 EFI
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malibud wrote: