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Tractor Talk Discussion Forum

Venturi on a carburator

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Peette

08-01-2006 19:55:18




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What is a venturi on a carburator?




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John T

08-01-2006 20:09:38




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 Re: Venturi on a carburator in reply to Peette, 08-01-2006 19:55:18  
Its the inner bore area where the bore diameter tapers down and decreases which causes the air velocity through it to increase and if theres a tube or an opening say down to where fuel is stored (like in the carbs bowl) the vacuumm created can suck gas up into the airstream where its blended with the air being sucked into the engine by the vacuum created when the piston goes down into the cylinder. Heck, its something like that I think lol.....

John T

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KEB

08-01-2006 20:09:37




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 Re: Venturi on a carburator in reply to Peette, 08-01-2006 19:55:18  
The part of the carburetor throat that narrows down, after the choke plate & before the throttle plate. The main jet outlet normally sits in the middle of the venturi. Narrowing the throat increases the speed of the air flowing through it, reducing the pressure (the venturi effect, named after the guy who discovered it) and thereby sucking gas up out of the bowl. Same principle as an airplane wing where air has to travel further, and therefore faster, over the top of the wing, resulting in reduced pressure compared to the air flowing over the bottom of the wing.

Keith

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