For Sale ‘73 and up Vacuum Amplifiers and Hose Parts

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haywire 440

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I really am not sure if they are used on the 300 or what they are used for. Both come together along with the hoses. Untested and no warranty. Everything is $25 plus the shipping.

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Those vacuum amplifiers weren't used until 1973 at the earliest as I recall and certainly not on a 70 300. When the emission control systems started incorporating exhaust gas recirculation (EGR) to lower nitrogen oxide emissions, it was desirable to ramp in the EGR in proportion to the engine RPMs and load of the engine to prevent sags or stumbles during acceleration. To do this, a very small tube was inserted into the throat of the carburetor and it became a very low vacuum signal proportional to the airflow into the engine. In order to be useful, though, it had to be amplified to develop enough of a vacuum level to modulate the EGR valve, which was the amplifier's job. Those units didn't hold up all that well over time though and not many people even want EGR valves to work on their engines any more.
 
I do guess at stuff (these were by a Hurst parts pile) and advertise it just in case someone can use it. I really appreciate the explanation of the parts and the uses.
 
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