Lycoming's views on best economy settings

"Ash Wyllie" wrote
GAMI claims something else is going on. Fuel from the upstream injectors is
leaking into the downstream intake ports, making the downstream cylinders
richer than the upstream cylinders.

They can claim anything they want - but if what they were describing
was real, the coke bottle test would show it and adjusting the
injector nozzles would fix it.

The coke bottle test won't find this, as it is an artifact of the way air
flows in the intake manifold.

I think we're talking at cross-purposes here. If you mean that the
problem is caused by improper air flow in the induction system, then
we have no argument. This is indeed the issue.

And adjusting the injector nozzles is what GAMI
is doing. By making accurate injectors designed for each cylinder all
cylinders provide the same power.

Well, no. If the air flow in the induction system is such that it
causes fuel to be carried from one cylinder to another after it leaves
the injector nozzles, there's no chance at all that the cylinders are
all getting an equal charge of air. Air flow requires changes in air
pressure.

Thus the cylinders DO NOT all provide the same power - they run the
same mixture, which is not the same thing.

Aircraft engines don't fail in the air, too often...

Really? Compared to what? Certainly not to car engines failing on
the road...

Michael