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Heated Throttle Body?


TerryD
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no, the coolant feed is there to prevent icing in the throttle body, when the ambient intake temp is such that any moisture could freeze and prevent smooth action of the butterfly the coolant , does not cool the throttle body, by heating the throttle body it allows the initial start up to run more smoothly, and as such decreases the warm up time.

it is a known, but pretty pointless mod to actually remove the coolant feed to the throttle body, as it will allow cooler denser air (in theory) to enter the cylinders

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it encourages smoother running and prevents the throttle icing up when very cold

I can't see how it would ever ice-up as its sitting on top of a hot engine?

if the ambient outside temperature is low enough, without a heated throttle body, or carburetor, you can cause icing on the butterfly and inlet venturi, because of the drop in temperature as the airflow increases through the inlet venturi, yes it sits on a hot engine, but in the winter, on a moving car, little heat can be absorbed into the surrounding components

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Yes Mat is correct. It is useful for cold starts as it aids slightly in getting the engine to operating temp quicker. the fuel from your injectors will struggle to atomise in colder temps so the extra heat early on helps the fuel atomise. this in turn helps fuel economy as less fuel is required on cold starts to achieve the desired A/F ratio to operate the engine as it mixes with the air more freely when atomised.

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Surely if a throttle body is heated by the engine coolant then it's going to be just as cold as the rest of the engine when it first starts up ? Wouldn't it have to be electrically heated to have any effect when the engine is cold ?

Good point! Anyway there is no pressure drop through the throttle body as its not needed. The engine has fuel injection?? :driving:

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Surely if a throttle body is heated by the engine coolant then it's going to be just as cold as the rest of the engine when it first starts up ? Wouldn't it have to be electrically heated to have any effect when the engine is cold ?

the Cold start adds more fuel on start up, this acts as a choke and allows the engine to warm quicker, the coolant feed to the throttle is taken directly from the main feed from the block.

during cold start the extra fuel is not at the point where optimum running is required, however when at optimum running temp, the cold start is not operating and the heated throttle helps with the warming of the air, improving engine efficiency, as stated above, in extreme cold the heated throttle prevents venturi icing......

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