[AT] fuel system question

[jtchall at nc.rr.com]

I can come up with a couple of ideas but no single reason:
No fuel pump, providing the tank is mounted higher.
Keeps the hood lower down.
Maybe being below the exhaust manifold keeps the  carb cooler---I might be 
stretching a bit with this one.


What tractors did use a downdraft carb? I think IHC F-12 and 14 did, but 
can't think of any others.

John Hall


-----Original Message----- 
From: Ron Cook
Sent: Saturday, January 19, 2013 8:37 PM
To: Antique tractor email discussion group
Subject: [AT] fuel system question

What is the reason most tractors and industrial engines use updraft
carburetors?  Some early inline automobile engines used updraft but they
switched to downdraft eventually.  Most aircraft engines use updraft.
Any ideas?  Maybe gravity fuel systems?

Ron Cook
Salix, IA
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