Power Enrichment Operation

I believe that most engines have a "power enrichment" device that
enriches the mixture beyond "full rich" on take-off.

1. Is this true for both carburetor and injected engines?

2. What activates it? It it the position of the throttle lever, some
sort of MP differential, or something else?

In article ,
(PaulH) wrote:

I believe that most engines have a "power enrichment" device that
enriches the mixture beyond "full rich" on take-off.

1. Is this true for both carburetor and injected engines?

2. What activates it? It it the position of the throttle lever, some
sort of MP differential, or something else?

On the B-24 and B-17 is was throttle position that enabled it.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html

As far as I know, power enrichment is only on the large radials and
like PaulH says, is a function of the throttle position. I think the
primary purpose is to keep the engine from detonating at high power
settings.

My A&P school was in 1970 and I've been around jets since, so this
question is a strain on the old gray matter!!

On Tue, 06 Jul 2004 06:51:04 -0800, Dale wrote:

In article ,
(PaulH) wrote:

I believe that most engines have a "power enrichment" device that
enriches the mixture beyond "full rich" on take-off.

1. Is this true for both carburetor and injected engines?

2. What activates it? It it the position of the throttle lever, some
sort of MP differential, or something else?

On the B-24 and B-17 is was throttle position that enabled it.

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.

Funny, my IO-320 increases EGT when I reduce from maximum throttle.

Kent Felkins

" 2. PE does not occur for injected engines.

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