Re: Best carb for gas mileage - Saab Vintage Models Bulletin Board - Saabnet.com
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Re: Best carb for gas mileage
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Posted by spiv (more from spiv) on Thu, 11 May 2006 22:03:12 Share Post by Email
In Reply to: Best carb for gas mileage, Drew Rogers, Tue, 9 May 2006 21:29:20
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I don't know if anyone has done a strict empirical test (which would be tricky, because to get a valid result you'd have to test each carb on the same car under the same conditions) but I suspect that you're going to find that your driving style makes more difference to MPG than which of these carbs you pick. Remember, if you're driving at part-throttle, the carb's throat size is basically irrelevant -- they're all capable of flowing more air than you're actually using.

Even if there are slight advantages to one carb model over another, I'd bet that the condition of your individual carb would be a bigger factor -- i.e., a well-tuned FoMoCo would beat out a grungy Solex even if the Solex is theoretically "better." So if I were you, I'd pick the one that's in the best condition and just go with it.

I've hardly ever measured my fuel economy with to-the-drop accuracy, but I can tell you that once, just out of curiosity, I measured it as accurately as I could over a long weekend mixture of mostly highway and some city driving. This was in a Sonett with a Weber DCNF carb, a synchronous (not progressive) model oriented more toward performance than economy, and even with that I averaged slightly over 31 mpg.

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