Posted by sotxbill on February 10, 2016 at 09:24:58 from (104.5.24.112):
In Reply to: up draft carbs. posted by F.E.Bear on February 09, 2016 at 18:43:44:
I AGREE... floats and needles were prone to sticking and tractors ran bad gas... So the updraft worked better in that environment. They prevented flooding, dilution of oil, hydro-locking, and fires by letting the gas drain below the exhaust manifold. ALSO kept carb low and helped avoid vapor locking from excessive heat and leaving a way for any gas bubbles to move upwards to the tank without being trapped.. pending fuel line design.
Improvements in carb and float technology allowed the addition of fuel pumps, and fuel pumps, allowed the elimination of vapor locking due to higher pressure lines having a higher boiling temperature. And then this allow down drafts, meaning that now (heavier than air) mixtures could flow downwards and give better starting and performance on newer designed engines. 12 volt systems allowed longer and faster cranking, allowing better starts.
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