On 8 Jul 2004 07:55:35 -0700, (PaulH) wrote:

From another group I have the following info:

1. Power enrichment is the usual practice for carbureted engines. It
is triggered in some cases by throttle position, in others by a
combination of throttle position and manifold pressure.

2. PE does not occur for injected engines.

Typically on a "modern" (clears throat) boxer aircraft engine the
carburetor leans the mixture in cruise as opposed to enrichment at
WFOT.

Some radial engine carbs have an enrichment valve that opens according
to throttle arm position.

TC