WB Instruments

[Bruce]

You want to *read* the combustion exhaust gases.  The other stuff is from
overlap, ie when both the valves are open, poor sealing valves etc..  There
is a time between exhuast events when the flow tries to slow way down,  yet
the column of moving air is trying to keep it moving so, there are low
pressure areas, and if the O2 refeneces to atmosphere then that will affect
things.  What the *other* stuff is doesn't matter one whit to what you as a
tuner are trying to do.  It's the peak of the pulse you want to concentrate
on.
Bruce

From: "Brian L Massey" <blocklm at juno.com>
Subject: Re: WB Instruments
> On Thu, 12 Jul 2001 23:44:05 -0400 "Bruce" <nacelp at bright.net> writes:
> > I beleive I was talking about a peek detector so as to be able to
> > ignore the
> > *inbetween pulse* areas of the O2s readings.   Depending on the
> > display
> > type, 50% of the info displayed is showing in between areas of the
> > exhaust
> > pulses,  my area of concern is reading what the AFR is indicated by
> > the
> > pulses.  Hope that clears up what I was saying
>
> Yes, it does, but it just says what I thought you said before! My
> question is, what is causing the inbetween pulse areas to show a
> different afr than the last pulse itself? Unless there is dilution going
> on, it seems like all you should see if a fairly quiet stairstep between
> the very close afrs of each cylinder, unless you have a misfire. Why does
> this normal case (no misfire) need filtering or peek detection? I know
> I'm missing something. Tnx.
>
> Brian


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