Econamizer PLUG

Carlyle hoffman · Jul 18, 2020

On all fuel tractor carbs what is the PURPOSE of the ECONAMIZER PLUG Marvin Schebular _ Carbs

gene bender · Jul 18, 2020

never heard or seen on an all the tractor carbs i have worked on such a thing

1948CaseVAI · Jul 18, 2020

Google has tons of info but it works a lot better if you can spell. There is a decent explanation here:

https://route249.com/2018/09/09/how-to-rebuild-the-marvel-schebler-carburetor/

David G · Jul 18, 2020

Economizer valves were used on cars during excessive vacuum so that during deceleration, it allowed the engine to suck in air without going through venturi giving it better ecomomy.

JMOR · Jul 18, 2020

(quoted from post at 12:36:54 07/18/20) Economizer valves were used on cars during excessive vacuum so that during deceleration, it allowed the engine to suck in air without going through venturi giving it better ecomomy.

hat is not the M/S implementation

Steve@Advance · Jul 18, 2020

What I've always thought of an economizer valve was internal of the carb, it read vacuum and changed the jetting according.

Holley and Autolite used the screw in diaphragm type, all others use metering rods.

Some of the updrafts have a place for them, but I've never actually seen one in place on a tractor carb on anything but the troublesome Ford Holley. I have seen them on updraft marine carbs. They used a combination accelerator pump/metering rod.

It sounds like a good idea, but they were prone to corrode in place, get stuck from sitting. It would be a nightmare with ethanol!

JMOR · Jul 18, 2020

(quoted from post at 13:45:44 07/18/20) What I've always thought of an economizer valve was internal of the carb, it read vacuum and changed the jetting according.

Holley and Autolite used the screw in diaphragm type, all others use metering rods.

Some of the updrafts have a place for them, but I've never actually seen one in place on a tractor carb on anything but the troublesome Ford Holley. I have seen them on updraft marine carbs. They used a combination accelerator pump/metering rod.

It sounds like a good idea, but they were prone to corrode in place, get stuck from sitting. It would be a nightmare with ethanol!

o, no, no......people keep interjecting all these schemes that are nothing like what he has in the M/S carb. It is a simple jet in a passage connecting throat of carb (near throttle plate) and the fuel bowl. It modulates bowl pressure as a function of throttle plate position, thus leaning mixture at part throttle. The linked article pretty much covers it along with all my drawings showing where/how connected.

electro · Jul 18, 2020

An economizer circuit just adjusts the mixture at mid throttle or so. Some automotive carbs apparently used valves that would enrich the mixture at wide throttle and others, the MS carbs and Zenith small engine and tractor carbs, lean the mix at mid throttle. One method will enrich the mixture at full throttle, the valve, and the other method, back suction, will lean the mixture at partial throttle. Both give the same results.The MS and Zenith carbs have the back suction style as JMOR described which lean the mix at partial throttle.

Some MS carbs use an economizer jet and some, such as the DTLX series, use a passage narrowing economizer plug. Since you mentioned a plug you likely are working on a DLTX series carb. The end result is the same with either the jet or a passage narrowing plug.

Econamizer PLUG

Carlyle hoffman

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gene bender

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1948CaseVAI

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David G

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JMOR

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Steve@Advance

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JMOR

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electro

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