[Diy_efi] RE: Ways to effectively use O2 sensor on motorcycle?

[Sven]

Thanks for the practical advice Neil.  Others have mentioned problems
keeping sensor at temperature.  A solution recommended to me was placing the
bung within 8" of the cylinder exhaust port.  Seeing this single cylinder
650cc bike has two exhaust ports, I'm not sure if enough exhaust gases
 325cc equivalent displacement ) will flow by sensor if mounted before
collector.  What do you think about this ?

Let's say I go heated, do you recall what such a heated unit draws for
current ?  On the rectified circuit of this dirt bike, there are only lights
( head and tail ) that consume 40 watts combined.  Since bike doesn't list
output of generator, I can only assume it's sized for about this load.  Can
anybody recommend simple heated units ( ones that I can plug a voltmeter
to ) that can run under this power constraint ?  If I wanted, could I do the
DIY_WB with these power constraints ?

Sven


---------------Original Message----------------------------
Subject: Re: [Diy_efi] Ways to effectively use O2 sensor on motorcycle?
To: diy_efi at diy-efi.org
From: Neil.Poersch at mts.mb.ca
Date: Fri, 31 May 2002 07:49:22 -0500
Reply-To: diy_efi at diy-efi.org


Sven,
I have used a heated O2 sensor on my Moto Guzzi motorcycle for about 5
years now.  I use a digital panel meter for routine monitoring and a Fl=
uke
DMM with min/max/avg capability for specific testing. You absolutely ne=
ed
the min/max/avg capability to do any sort of controlled testing.

I did try a unheated O2 sensor but found it too dependent on EGT to pro=
vide
meaningful readings.  I strongly suggest using a heated unit.

Overall a basic "narrowband" heated O2 sensor will give you some
interesting info, saving you the need to do a lot of plug chops and giv=
ing
you pretty good jetting but it is still dependent on EGT and you will n=
ot
be able to produce the "ultimate" jetting.

The Wideband O2 sensor and associated circuitry developed by some of th=
e
wizards on this list will give you a better chance at finding that
"ultimate"setting.

Neil


-----Original Message-----
From: Sven [mailto:svenc at qwest.net]
Sent: Thursday, May 30, 2002 6:52 PM
To: diy_efi at diy-efi.org
Subject: Ways to effectively use O2 sensor on motorcycle?


Hi list.  If there is a more appropriate list for this subject, please
advise.

I have never tried to interpret the output of an O2 sensor.  In this
particular case I am looking to use a DMM to figure out if which carburetor
circuits are creating lean or excessively rich air/fuel mixtures.  The DMM
has 5ms resolution in "capture" mode which records the lowest and highest
values ( volts DC from sensor ) while in the mode.  An tone is produced when
a new low or high is recorded which, if it can be heard while riding, might
give some indication as to which carburetor circuit is responsible.  If not,
I'll just retrieve low and high value after the ride, adjust accordingly,
and test again.

Before I have a bunghole welded and mount the Bosch Universal O2 sensor
 part # 11027, single wire, unheated ) I'd appreciate peoples comments on
the effectiveness of this technique .  Any other ways to use an O2 sensor to
tune carburetor ?

Sven



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