> > Hi All-
> >
> > Now that I have my newly-updated EC2 and EM2 back in place, I
wanted
to
> wire
> > in the O2 sensor to enable auto-tuning mode before I try for a >
> startup
> > again. The suggested O2 sensor, unfortunately, requires a
18mmx1.5thread.
> > A tough tap to find. Worse, it requires a 16.5mm pre-drill -- even
> harder
> > to find.
> >
> > Anyone have any suggestions on how to get my hands on
either/both of
> these
> > without spending an arm & a leg?
> >
> > Mark (Rocky mtn high)
> >
> > Magic words are Metric Hand Taps http://www.mcmaster.com/ Cost one
arm.
> >
> > Magic words are Metric Drills http://www.mcmaster.com/ Cost one
leg.
> >
> > Or if worse comes to worse a 41/64th will work.
> >
> > Also try Enco or Airgas or Rutland Tool and Supply
> >
> > Don't forget to make a quart vac can to smooth out those
intake pulses.
> >
> > I'll stop in on my way back or too OSH (Tuesday next week) and help
out.
> > It will help if you have or can rent a scope. We can take the
lid off
> Tracy's computer
> > and put a scope on the output wire of the pressure sensor. Or we
can
> > buy a pressure sensor and feed it some power and use it to
monitor > > the
> pressure
> > pulses. Or I can bring my computer and power it up and connect
to > > that
> pressure
> > sensor. We can tee off the pressure hose.
> >
> > Paul Lamar ...No rotor no motor.
> >
>
> For the O2 sensor, I got a "bung" that I welded into the exhaust >
system.
> It's the same thread as an 18MM spark plug. I think I got it at
NAPA,
> but I'm not sure.
>
> Bob W.
Thanks, Bob -- the bung is clearly the way to go!
Paul - I have a choice of a steel bung for $5.95 & a stainless bung for
$6.95. Any reason to pick one over the other? (In terms of
weld-ability
I
mean).
Mark (Rocky Mtn high)
Go with the SS. Do you have a scope? I might be able to bring mine
if not. We need to get a handle on this intake pulsation problem.
--
Paul Lamar ...No rotor no motor.
I do not have an oscilloscope. Let me post a message to the local
EAA'rs &
see if I can scare one up.
mrs
Great Mark. Maybe Doc has one. We can trigger off the crank angle sensor
signal.
--
Paul Lamar ...No rotor no motor.
I have been considering buying a scope. What bandwidth, channels, etc. is
needed?
I am extremely interested in this.
Doc Custer
Retired Software Engineer and sometime Audiologist
Well most scopes are 100 MHZ and two channels.
They still run about $1500 new.
You can some times find used bargains on e-bay.
This is a classic. Four channel and 350 MHZ
http://www.exphil.com/products/Tektronix/2465A
A bit over kill for single chip computer use.
http://www.google.com/products?q=Tektronix+2465A+&hl=en&um=1&sa=X&oi=froogle&ct=title
I have something like this one. Works great for single chip computer use.
http://www.google.com/products?q=Tektronix+465&btnG=Search&hl=en&show=dd
Make sure you get probes in the bargain as they can run into real
money.
Doc,
For working around airplanes, I can't emphasize enough the value of a
portable instrument. I would suggest looking for a used Fluke 192B or
196B Scopemeter.
http://us.fluke.com/usen/products/Fluke+190.htm?catalog_name=FlukeUnitedStates&category=SCM(FlukeProducts)
Another good choice would be the Tektronix TDS1000B or TDS2000B.
http://www.tek.com/products/oscilloscopes/tds1000_tds2000/index.html
Another would be the Agilent (Hewlett Packard) DSO3102A.
http://www.home.agilent.com/agilent/product.jspx?cc=US&lc=eng&ckey=1000003120:epsg:pgr&nid=-536902749.0.00&id=1000003120:epsg:pgr
All of these scopes are inherently digital and can be interfaced with a
PC for data storage and analysis.
Aubrey Thompson
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