"Frank Stutzman" wrote in message
...
Dan wrote:


JPI mentions GAMInjectors as required for the Lean of Peak method.

Which is just one way the JPI manual is flat wrong. The big radial
engines
in airline use were run LOP as SOP. That was way before fuel injection.
I can run my carbed E-225 LOP (although only about 20 degrees before it
gets too rough) as can lots of other carbed engines. It may take some
induction tuning or playing with carb heat to make it happen though.

True!, and Deakin emphasizes that point, but the context is that the radial
engines, due to their design, had more even fuel flow/distribution, even
with carburetors.

Currently, the Jacobs 755 radial has a single updraft carburetor and thus
has fuel distribution on par with a HO layout. They recently got approval to
replace the single carburetor with a FI unit and they report it's "turbine
smooth".

Now, Newps says he runs significantly LOP without GAMI's, but his is, I
believe, an anomaly. OTOH, my old TNIO-550 ran smooth right up to fuel
cutoff with GAMI's, and like a La-z-boy vibrator without them! :~)