Steve,
That would be a wonderful idea! I am
still thinking about the pictures of your deck with 3 feet of snow on it from
last year! During your takeoff run will the P51 scoop up snow??
I guess I was not clear previously. Turning
off the secondary brings the mixture from about 14.7 to about 13.0. From
what you say, this should not happen. There should be no change.
From idle with both disable switches
on. Normal operation. If I then turn on the cold start, the mixture
goes to about 10 from a previous about 14.7
I may be confused from what you are asking
below but, I have never had both disable switches on at the same time. Only
one at a time. Usually nowadays, the secondary first, slight increase in mixture
shows up on the O2 sensor, them secondary back off, then the primary on, engine
tries to die, turn it back off rapidly to recover.
I have yet to try to recover the engine
die condition by turning on the cold start switch. I only now turn the
primary switch back off to cause the engine to recover. I plan to try the
cold start switch next time.
Come on down! :>)
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Monday, January 25, 2016
4:11 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: parts
upgrade; was: What do you think may be happening?
Bill,
I agree that once a
logic level ground is applied to EC2 pin 30, it shouldn't matter where
that connection comes from or how many there are.
It would be good to
verify that I am understanding correctly the series of events described below:
"With the engine at idle, mixture at
14.7, disabling the secondary brings the mixture to about 13.0. If I turn
both disables on, and then turn cold start on, the mixture goes really rich
around 10."
The first sentence
seems straightforward but troubling as stated previously.
In the second
sentence, are you saying that beginning with the engine running normally with
the injector disable switches both off (normal operating position), you then
turn both injector disable switches on? At this point does the
engine begin to die? If it does, this is normal. If you then
turn on the cold start switch before the engine stops, does the engine recover
and run very rich? If it does, then this is not normal and the cold start
switch is somehow supplying bus power to the injectors instead of
supplying a logic ground to the EC2 pin 30.
This seems like quite
a remote possibility, so I am probably not understanding your description
correctly.
I now have 8 minutes
of flight time on my P51 type cooling scoop and revised exhaust system.
Maybe a test flight to Texas
is now in order?
Steve Boese
From: Rotary motors in aircraft
<flyrotary@lancaironline.net> on behalf of Bill Bradburry
<flyrotary@lancaironline.net>
Sent: Monday, January 25, 2016
2:07 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: parts
upgrade; was: What do you think may be happening?
Steve,
Ok, when you turn on the
disable switches, they ground the pin 30 input on the EC-2 to the case of the
EC-2. When you turn on cold start, you ground the pin 30 to the
case. How the heck does the EC-2 know the difference so that it can act
differently???
Bill