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heater control valve vacuum pressure

This is a discussion on heater control valve vacuum pressure within the Flair Birds [1964-1966] forums, part of the Thunderbird Model Years category; Can anyone tell me how much vacuum is needed to operate the heater control valve. Thanks, - John...

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Old 03-16-2018, 04:52 PM
 
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heater control valve vacuum pressure

Can anyone tell me how much vacuum is needed to operate the heater control valve.

Thanks,
- John
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Old 03-19-2018, 10:17 AM
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A simple lever valve that size shouldn't take any more than one pound of force to operate (probably a lot less). The diameter of the vacuum cylinder is about 1-1/8", meaning that it is about 1 square inch area. So 1 pound divided by 1 square inch = 1 pounds per square inch. That equals about 2 inches of Mercury (in Hg), which is the common unit to measure vacuum.

So the valve should open under 2 inches of vacuum. Your engine, at idle, should generate at least 15.
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