Thermostat for GT40
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=47772
Printed Date: November-15-2024 at 10:00am
Topic: Thermostat for GT40
Posted By: Mpost
Subject: Thermostat for GT40
Date Posted: July-19-2019 at 1:57pm
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My real question here is what difference does running at 140 VS 160 make on a 98 SN with GT40 MPI? performance? fuel usage? While using the boat the past week for skiing and cruising it is running right around the 140 range on the temp gauge. Only time it goes higher is during a shutdown, and then upon starting it immediately drops back down to 140. This is running during 85 to 90 deg outside temps and 80 surface temp. I used the IR temp gun to check block temp etc. and just below the thermostat yesterday was reading 137 while idling after a run. Top of Tstat housing around 110. So I am confident that my gauge is close. Have a new 160 tstat to install and am just assuming there is a 140 in it now, but could just be old and wearing out? And just because we all love pictures  Thanks for any replies as always  ------------- 84 SN Sold 98 SN Lund Pro V 1975 Alumacraft |
Replies:
Posted By: 8122pbrainard
Date Posted: July-19-2019 at 2:20pm
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Martin, You are normal.  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: MrMcD
Date Posted: July-19-2019 at 3:17pm
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If your GT40 has a carburetor 143 is the thermostat setting. If it is a Fuel Injected engine the setting would be 160. ------------- |
Posted By: KENO
Date Posted: July-19-2019 at 4:30pm
He says right here it's fuel injected  All GT40's are fuel injected, some engines with GT40 heads had carburetors but they were named something different too. Since you're running cooler than 160, the computer is probably making the engine run a little richer. I'd say not much performance difference at all and probably nothing you'd really notice as far as fuel usage either. If you haven't looked at the thermostat at some point, you may find it's a 143 like mentioned or it could be a 160 that's stuck open or maybe there's nothing at all in there. Oh BTW, if Pete thinks you're normal, coming from somebody like him I'd be worried about myself. I think you're pretty normal, but I'm far from normal like Pete is just more reason to be worried
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Mpost wrote:Posted By: Gary S
Date Posted: July-19-2019 at 4:47pm
 ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: Mpost
Date Posted: July-19-2019 at 7:18pm
  thanks all, Ill report back when I pull it and replace. ------------- 84 SN Sold 98 SN Lund Pro V 1975 Alumacraft |