Thermostat Recom.
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Joined: Jul 2000
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Thermostat Recom.
Hi guys,
I'm looking for your suggestions on thermostats.
First, my truck:
67' F-100 240/L6 (fully rebuilt and running beautifully for 3 yrs.) three on the tree, with a 3.7 rear-end. 235/75/R15 tires..ect
Right now I have a 180 t-stat in there, and it rides the bottom egde of normal all of the time. Even when I tow a 3,000lbs. 19ft Wellcraft boat.
Other info: I live up here in beautiful Western Washington where it rains a lot, and the temp ranges from freezing to about 90 if we're lucky.
I'm tossing around the idea of changing to like a 195 t-stat because I've heard you can get slightly higher MPG. I also battle carb. freeze-up whenever it gets around 40 and rainy, or I hit the pass for some skiing.
What do you think?
Thanks,
Brian
I'm looking for your suggestions on thermostats.
First, my truck:
67' F-100 240/L6 (fully rebuilt and running beautifully for 3 yrs.) three on the tree, with a 3.7 rear-end. 235/75/R15 tires..ect
Right now I have a 180 t-stat in there, and it rides the bottom egde of normal all of the time. Even when I tow a 3,000lbs. 19ft Wellcraft boat.
Other info: I live up here in beautiful Western Washington where it rains a lot, and the temp ranges from freezing to about 90 if we're lucky.
I'm tossing around the idea of changing to like a 195 t-stat because I've heard you can get slightly higher MPG. I also battle carb. freeze-up whenever it gets around 40 and rainy, or I hit the pass for some skiing.
What do you think?
Thanks,
Brian
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Joined: Jul 1999
Posts: 3,172
Likes: 4
Thermostat Recom.
Brain ,
You have to remember that a leaner / hotter engine will use less fuel . In your case possibly switching to a higher temp thermostat will solve the problem . Carb icing will occur , esp at higher altitudes , if the temp and dewpoint are within 10 deg of one another which is often the case where you live due to the higher humidity . You need to make sure your truck has the means to warm the carb / upper intake area to prevent icing . The carb is mounted in such a way that engine heat isnt always enough to prevent icing . You should have some version of the flexible pipe from the manifold to the breather so that warm air prevents the icing esp under higher vacuum conditions ( idle , low rpm ) Carb ice will cause problems , I know this from flying , Cessnas have a control to divert heat from the exhaust manifold to the carb to prevent icing during landing when the engine is under low rpm conditions , same applies to your trucks engine . Try a higher thermostat , it wont hurt anything and check to see if plumbing from the exhaust to the breather is in place .
Paul
You have to remember that a leaner / hotter engine will use less fuel . In your case possibly switching to a higher temp thermostat will solve the problem . Carb icing will occur , esp at higher altitudes , if the temp and dewpoint are within 10 deg of one another which is often the case where you live due to the higher humidity . You need to make sure your truck has the means to warm the carb / upper intake area to prevent icing . The carb is mounted in such a way that engine heat isnt always enough to prevent icing . You should have some version of the flexible pipe from the manifold to the breather so that warm air prevents the icing esp under higher vacuum conditions ( idle , low rpm ) Carb ice will cause problems , I know this from flying , Cessnas have a control to divert heat from the exhaust manifold to the carb to prevent icing during landing when the engine is under low rpm conditions , same applies to your trucks engine . Try a higher thermostat , it wont hurt anything and check to see if plumbing from the exhaust to the breather is in place .
Paul
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Thermostat Recom.
Paul,
Thanks for your guick reply.
I think I'll try the 195 when I have some time and a few bucks burning a hole in my pocket.
As for icing, you're right, and I'm in the process of tying to figure out what I can rig up to help heat the carb.
When I got the truck it only had an oil bath and no other means of "warm air" being given to the carb. I also have what I believe is an EGR plate between my manifold and carb. Which seems to insulate the carb even more from geting it's warmth. I tried removing this, but the way the manifold is molded, my carb linkages hit the manifold when it sits directly on it. (if that makes sense :-)
It was originally a California truck (for what it's worth)
I don't know what else to do. I coverted to a paper filter that sandwiches between to chrome pieces on top of the carb because I didn't feel good about my oil bath.
So. I'm slowly looking through junk yards to see if I can find some sort of heat stove and air filter "holder" that will fit on my little 1bbl carb.
Thanks again, and if you have any other ideas I'd love to hear them.
Brian
Thanks for your guick reply.
I think I'll try the 195 when I have some time and a few bucks burning a hole in my pocket.
As for icing, you're right, and I'm in the process of tying to figure out what I can rig up to help heat the carb.
When I got the truck it only had an oil bath and no other means of "warm air" being given to the carb. I also have what I believe is an EGR plate between my manifold and carb. Which seems to insulate the carb even more from geting it's warmth. I tried removing this, but the way the manifold is molded, my carb linkages hit the manifold when it sits directly on it. (if that makes sense :-)
It was originally a California truck (for what it's worth)
I don't know what else to do. I coverted to a paper filter that sandwiches between to chrome pieces on top of the carb because I didn't feel good about my oil bath.
So. I'm slowly looking through junk yards to see if I can find some sort of heat stove and air filter "holder" that will fit on my little 1bbl carb.
Thanks again, and if you have any other ideas I'd love to hear them.
Brian
