Hi
Mike,
I guess I’m missing
something - If your mixture monitor shows stoich at full throttle, then it’s
not solely an airflow problem – it appears to me that it’s the lack of
sufficient fuel. IF you are at stoich 14.7:1 A/F ratio then that means you
have more oxygen available in your system to support burning more fuel = more
power. You should be able to enrich the mixture particularly at
full throttle (assuming you are wanting full power at full throttle) to around
12.65:1 air/fuel ratio for best power. I know you know all of this -
that is why I am puzzled by your statement that you feel it’s an airflow
problem when on the surface with the Stoich ratio it would appear it’s a lack
of sufficient fuel.
Ed.
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mike Wills
Sent: Thursday, October 15, 2009 11:22
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: where's the
missing power?
Sorry for my absence on a
topic I started. My nephew had a skateboarding accident last weekend and
is in the hospital in a chemically induced coma until his brain swelling is
under control. And I thought car powered airplanes were dangerous. Stay away
from skateboards.
Tracy - My
mixture monitor shows stoich at full throttle. I suspect an airflow issue
rather than fuel.
Al - my vacuum gauge is located in
the plenum directly behind the throttle
plates.
Lynn - I agree
that the TB inlet is horrible and needs a bell mouth. The inlet is also pretty
obstructed by the cowl which isnt visible in the pics I sent. I think I'll
make an attempt to clean this up some and see if it gets me anywhere. If not
I'll live with it for a while.
Kelly - always tough to determine
if the problem is an engine issue or if the load is simply too much for the
engine to overcome. I'm going to experiment with the shallow dive several have
suggested and see what happens.
----- Original Message -----
Sent:
Tuesday, October 13, 2009 4:21 PM
Subject:
[FlyRotary] Re: where's the missing
power?
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Al Gietzen
Sent: Tuesday, October 13, 2009 7:22
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: where's the
missing power?
I dont have a regular manifold
pressure gauge, just an industrial type vacuum gauge ( I really gotta get an
MP gauge). Anyway, the vacuum gauge was indicating 4" of
vacuum.
Where are you
measuring the 4” vacuum? If it is near the ports it is no unusual; if
it is out before the runners; something is
wrong.
Al
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