automotive carburetor adjustable main jet, does it exist?
#1
Mopar Fanatic
Thread Starter
automotive carburetor adjustable main jet, does it exist?
I was wondering.
On a carburetor, the idle circuit is variably adjustable by a needle screw, right? So, it's like a non-fixed jet? Why isn't that done with the main circuit?
That how it seems to work on older small engines, with the main adjustment on the bottom of the bowl.
I did a search and found this.
but, It looks like this for small engine/agriculture equipment. So... why not automotive engines? Why use a fixed jet that has to be changed for adjustment?
Or do I have this whole thing wrong and don't know how a carburetor works?
On a carburetor, the idle circuit is variably adjustable by a needle screw, right? So, it's like a non-fixed jet? Why isn't that done with the main circuit?
That how it seems to work on older small engines, with the main adjustment on the bottom of the bowl.
I did a search and found this.
but, It looks like this for small engine/agriculture equipment. So... why not automotive engines? Why use a fixed jet that has to be changed for adjustment?
Or do I have this whole thing wrong and don't know how a carburetor works?
Last edited by dodgem880; 09-22-2017 at 05:13 PM.
#4
Mopar Lover
An automobiles carb will have multiple fuel circuits, each one dealing with a specific rpm or load to keep a consistent fuel mixture over a large rpm range. Small engine will have a much smaller rpm range and predictable single load making a simple carb with two fuel circuits enough to manage the demand.
When you look into auto carbs you'll find how complicated and precisely engineered they are.
When you look into auto carbs you'll find how complicated and precisely engineered they are.
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