Intake pre-heater.
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Junior User
Joined: Nov 2005
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From: Sandia Park, New Mexico
Intake pre-heater.
<O
</O<O</O
I think it’s called an intake pre-heater. The thing-a-majig that hooks to the heat shield that allows warm air get into the air cleaner/carburetor.
Anyway, is it supposed to be closed normally, then open when it gets hot.
Or is it normally open, then close off when very cold, allowing warm air to flow in until warm.
I tried to test it by putting it in the deep freeze, but no workie.
I jerry-rigged the thing to allow more warm air to flow in. Is this a good idea?
Most people leave this un-hooked. But I only drive this a few time a year, and it’s always cold!
Plow/Truck
</O<O</OI think it’s called an intake pre-heater. The thing-a-majig that hooks to the heat shield that allows warm air get into the air cleaner/carburetor.
Anyway, is it supposed to be closed normally, then open when it gets hot.
Or is it normally open, then close off when very cold, allowing warm air to flow in until warm.
I tried to test it by putting it in the deep freeze, but no workie.
I jerry-rigged the thing to allow more warm air to flow in. Is this a good idea?
Most people leave this un-hooked. But I only drive this a few time a year, and it’s always cold!
Plow/Truck
Senior User
Joined: Jul 2003
Posts: 204
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From: Montana
A friend used to fly planes - military in Vietnam, commercial aircraft, crop dusters. He said the best way to avoid carburetor icing is to provide preheated air to the carburetor. He runs carb preheat on all his rigs. Some of his rigs he runs a choke type cable to the flapper valve so he can turn it on-off. The Ford flapper is in the closed position (letting in heated air only) until the temp sensor on the valve warms up enough to open the valve to let cold air in. I thinks its better to have the heated air rather than use the exhaust heat crossover that gets the intake manifold so hot you can't touch it.
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Junior User
Joined: Nov 2005
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From: Sandia Park, New Mexico
Thanks FEmtnmax,
Your information was very helpful.
Sounds like I did ok by pulling on the spring to close off the intake to allow more heated air in. I didn’t completely close off the cold air, just in case its not working. Probably not a good setup for running on a daily driver.
Is the pre-heater replaceable or available?
Plow/Truck
Your information was very helpful.
Sounds like I did ok by pulling on the spring to close off the intake to allow more heated air in. I didn’t completely close off the cold air, just in case its not working. Probably not a good setup for running on a daily driver.
Is the pre-heater replaceable or available?
Plow/Truck
Senior User
Joined: Jul 2003
Posts: 204
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From: Montana
That ranch friend leaves the flapper set to hot air for the entire winter. Its not like the heated air is so hot it'll damage something. Maybe watch the air filter element for signs of excess heat. I want to get my hot air flapper working to draw air from around headers. Haven't done it yet. The old '67 truck kinda gets pampered in the winters to avoid road salt, so I don't drive it much. Its kinda like working on farm equipment. Winter is for tear down and making improvements.
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