"G.R. Patterson III" wrote in message ...
David Megginson wrote:

Perhaps it's because the O-320 (and O-360?) is able to
have all four cylinders equidistant from the carb.

Doubt it. The carb on *my* O-320 is located behind the engine. No way all four
cylinders are equidistant from the carb. I doubt that Lycoming has set up a
tuned induction system either, but it's possible.


It seems to vary from one installation to the next. My carburated
O-360 will not run LOP. Well, it runs, but not very smoothly. My
flight manual lists a procedure for LOP (called economy cruise), but
my engine goes rough approximately 10 degrees LOP.

John Galban=====N4BQ (PA28-180)