Carburetors: Weight or Volume? Moe in Wichita, KS Wants to Know

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Discussion Overview

The discussion centers around the functioning of carburetors, specifically whether they operate based on weight or volume when mixing air and fuel for an engine. Participants explore the principles behind carburetor operation and the mechanisms involved in fuel delivery.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants assert that carburetors measure air and fuel by weight, as suggested by manufacturer information.
  • Others propose that carburetors utilize volume flow to deliver fuel into the engine, referencing the principles of airflow and pressure differences.
  • A participant explains that carburetors operate based on Bernoulli's principle, where the speed of air affects pressure and subsequently influences fuel flow into the airstream.

Areas of Agreement / Disagreement

Participants express differing views on whether carburetors primarily use weight or volume for fuel delivery, indicating that the discussion remains unresolved.

Contextual Notes

There are assumptions regarding the definitions of weight and volume in the context of carburetor operation that are not fully explored. The discussion also relies on interpretations of Bernoulli's principle and its application to carburetor mechanics.

moe7404
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moe in wichita ks
i started working on carburators in 1965. i read every thing i could get my hands on about carbs. all the info i got from the carb manufactors was that carbs weigh the air and fuel. but i have a couple of guys say a carb uses volume to put the fuel in a engine. so is it weight or volume? thanks.
 
Engineering news on Phys.org
I'm moving this from General Physics to the ME and Aero forum, where it will get more knowledgeable feedback.
 
Carburetors basically work by measuring air flow based on pressure difference, or volume flow if you want to put it that way.

Wikipedia.com said:
The carburetor works on Bernoulli's principle: the faster air moves, the lower its static pressure, and the higher its dynamic pressure. The throttle (accelerator) linkage does not directly control the flow of liquid fuel. Instead, it actuates carburetor mechanisms which meter the flow of air being pulled into the engine. The speed of this flow, and therefore its pressure, determines the amount of fuel drawn into the airstream.

http://en.wikipedia.org/wiki/Carburetor
 
moe in wichita ks
thanks for moving this subject. thanks to mech engineer for your answer. i guess i knew what you said, i just thought it ment that the air was weighed, but your answer is very good, thanks
 

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