Heated air to carb

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Dec 26, 2007 | 05:15 PM

lm987

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Joined: Oct 2003

Posts: 153

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Heated air to carb

Greetings,
I have a question regarding the intake air going through the air cleaner and then to the carb. I have a '70 Ford 302 that is going into a '50 F-1. The air cleaner has provisions to heat the incoming air. This is provided thru a metal heat shield attached to the exhaust manifold and then directed to the snorkel where a thermostat opens or closes a door to let the heat in or not. Installing the 302 requires that I use hugger headers to clear the steering shaft, I therefore cannot use the stock heat source. The majority of the swaps I have seen do not provide any provision to heat the incoming air or am I missing something? Is it really important to heat the incoming air??

Thanks
lm987

Dec 26, 2007 | 05:22 PM

fmc400

MSEE

Joined: Apr 2004

Posts: 10,386

Likes: 35

From: Austin, TX

Sometimes you need it, and sometimes you don't. I have gotten away without using it on all of my Fords, but many people have to do it. I'd say it depends on the climate and moisture in the air. I'd go ahead and install it without it, and see if it works out. If you start having a lot of cold-running issues, it is possible the internal passages in the carb are icing up without the hot-air system, and at that point you might have to come up with a way to fabricate a new heat shield to fit around your headers.

Dec 26, 2007 | 05:25 PM

LxMan1

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Joined: Dec 2001

Posts: 22,436

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From: Louisville,Ky.

On my 77, I took some aluminum 2" tubung and made a piece that clamped over a header tube (with enough air gap to breathe) and welded a piece over the hole to hook the hose going up the the air cleaner, because my carb would ice up every time in the cool weather.

Here is a pic of my set-up https://www.ford-trucks.com/user_gal...=62258&width=2

Last edited by LxMan1; Dec 26, 2007 at 05:28 PM.