The wbo2 I'm using is the one on my Spit EFI pages.
a 'sibling' of the d-i-y wb02. It's the auzie version
http://www.techedge.com.au/vehicle/wbo2/default.htm
I have v1. 1.5 and now 2.0 is due out, using a MUCH cheaper
sensor as well.
Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com
----- Original Message -----
From: "Randall Young" <ryoung@navcomtech.com>
To: "Triumphs" <triumphs@autox.team.net>
Sent: Thursday, May 22, 2003 8:18 PM
Subject: RE: crankcase pressure and wideband o2 meters - long but WOW!
> > So I look over at the wb02 meter. Thumb on the pipe... idle A/F is now
> > at 15.8. LEAN! HHmmmm. plug the pipe back on the valve cover...
> > right back to, and dancing around 14.7-14.9 on the meter.
> >
> > Again... I ponder...So at high revs...I must be forcing even MORE air
> > in past the carb piston so it must be running even leaner?
>
> Paul, this is where you lost me. First, the fact it's running leaner with
> the vent tube plugged, means that whatever was coming through the tube was
> richer than 14.8. Not surprising when you figure that the purpose of this
> system is to vent fumes that have been collected by the carbon in the
> canister, and there should be no oxygen in the crankcase fumes
>
> Second, why would you think the problem gets worse at high rpm ? The
amount
> of air flowing past the piston is obviously much larger, but since the
> depression between the piston and the butterflies stays more or less the
> same, the amount of air/fuel pulled through the emission system would also
> remain the same. So, it would actually make up a much smaller percentage
of
> what the engine sucks.
>
> IMO this was deliberate on the part of the original designers, to make the
> mixture go lean at idle, thereby lowering idle CO.
>
> > So here we go... I'm about to re-design the crank venting system.
> > to work as it 'should' .
>
> If you're going to do that, why not go whole hog, and design a true PCV
> system with a fresh air intake, and an exhaust to intake manifold vacuum ?
>
> BTW, is your A/F sensor the 'EGOR' that was discussed some years ago on
the
> DIY-EFI list ? If so, how do you like it? I've been wanting one of
those
> ...
>
> Randall
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