Is It Possible ? An Unasked MC2100 question ? - Page 2 - JeepForum.com
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post #16 of 17 Old 12-01-2011, 08:52 AM
scrapman
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1984 CJ7 
 
Join Date: Apr 2010
Location: Tyler, TX
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Originally Posted by cj5752 View Post
The venturies are machined into the carb body. If you look down the throat of the carb you will see it is tapered to a point then becomes wider again. this constriction is the ventury. The taper speeds up the air to make it draw fuel through the jets better. If the venturie area becomes to large for the amount of air you are pulling the air speed drops and you don't get as good of vacuum sinnal at the boosters. At this point throttle response gets worse.
I think he is talking about taking the venturi cluster out of a 1.08, and using it in a 1.21, which is a better rebuild candidate for him. He says he has found a 1.21 where the bottom openings are the same size as a 1.08, I don't see why this wouldn't work.

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post #17 of 17 Old 12-01-2011, 10:57 AM Thread Starter
Oily
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1985 CJ7 
 
Join Date: Jun 2006
Location: Kerrville, Texas
Posts: 1,577
Quote:
Originally Posted by cj5752 View Post
The venturies are machined into the carb body. If you look down the throat of the carb you will see it is tapered to a point then becomes wider again. this constriction is the ventury. The taper speeds up the air to make it draw fuel through the jets better. If the venturie area becomes to large for the amount of air you are pulling the air speed drops and you don't get as good of vacuum sinnal at the boosters. At this point throttle response gets worse.
Wow ! That makes sense, . Even the rebuild kit exploded view identifies part #37 as the venturie boosters. I need to examine all of my boosters.
I don't have an inside micrometer. I could feel the taper you speak of. Upon visual inspection, I can even see casting marks at the taper. They do look different on my 1.21s with the larger butterfly openings but the 1.21 with the same sized butterflies as my 1.08, look the same.
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