Actually, Bill, now that the wide band
sensor have come down in price (were over $250 when I first started looking at
them a few years back), I may consider re-writing some of the EFISM code,
so that a buyer would have the choice of narrow band or wide band ( they would
have to provide the sensor and I would probably suggest the Bosch). I
personally believe that the narrow band O2 gives all the useful
information we need – but, hey, if some folks want a wide band then the
customer is always right {:>). The only real difference is the voltage
curve extends over a wider range (like 0 – 3.5 volts, it varies) and most
importantly is much more linear than the ‘Z” curve of the narrow
band.
I may have to get one to play with.
Ed
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Saturday, January 02, 2010
2:02 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: first
flight of the new year
Maybe so, but it seems no farther than it is in the car and that has to
work quicker than it does in our app. Cars don’t go all squirrely
when you coast down a long hill??? We all need broad band sensors so we
can tell what is really going on. I am hoping that Ed will get upset by
all this and build one we can buy from him for about a buck! :>)
When can we expect the prototype, Ed??
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mike Wills
Sent: Saturday, January 02, 2010
12:16 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: first
flight of the new year
My exhaust header is an equal length type with 28"
inch primaries into a 2 -> 1 merge collector. The O2 sensor is threaded into
the collector so I estimate it is about 36" from the exhaust port. It
usually takes about a minute for the readings to settle down after a cold
start, but I've always assumed that they were accurate - even at idle. Maybe
that is an incorrect assumption.
Sent: Saturday,
January 02, 2010 6:48 AM
Subject:
[FlyRotary] Re: first flight of the new year
Happy New Year everybody!
Mike,
How far from the exhaust ports is your O2 sensor located? Does
anyone know what the minimum temp is for the O2 sensor? 800 degrees?
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Saturday, January 02, 2010
8:31 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: first
flight of the new year
Happy New Year to you, Mike
Wow. I’ll bet you are glad to
be in a different year and glad the old one gone.
I noted your comment on the lean/rich
possible O2 cause. Do you have a heated (3-4 wire) O2 sensor or an
unheated one??
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mike Wills
Sent: Friday, January 01, 2010
9:43 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] first flight
of the new year
Hope the holidays are treating you all well. Things are
kind of slow on the list this week. So figured I'd get things going.
I havent flown for almost 2 months. First my nephew's
accident (he's recovering amazingly well). Then travel for work. Then had to do
an annual on the airplane. Finally, had surgery to remove my appendix and gall
bladder. Been a busy couple of months.
But I'm feeling pretty good now, the airplane is ready for
its first flight after the annual, and today was a spectacular day here with
clear blue sky, unlimited visibility, light breeze, and temps in the mid 60s. I
resolved a number of minor issues during the annual, including the gas smell
that I've been living with for a while now. Found my left tank vent line
was loose where it penetrates the bottom of the fuselage so was venting into
the cockpit. The smell is now completely gone.
Also found a solution to a problem I've been noticing
since I've started flying further from the airport. I'd noted on previous
flights when returning to the airport with a long low power descent that the
engine runs quite lean as I enter the pattern requiring the mixture knob to be
turned full rich. On a couple of occasions I've had some misfiring as I turn
final - quite an attention getter! Today I realized the problem was a
non-problem, in other words operator error. While descending (and for that
matter, frequently at other times) I tweak the mixture based on the mixture
monitor reading. Today I ignored the monitor and just left the mixture alone
which worked just fine. I think during prolonged low power descents
the O2 sensor cools off and provides an inaccurate reading. The occasional
misfire was the result of running too rich (the mixture monitor indicated mid
range readings).
So todays flight was trouble free and gets me an hour
closer to the end of phase 1. 18 hours down, 22 to go.
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