DIY_EFI Digest V5 #843

[Clare Snyder]

>
> Date: Thu, 25 Oct 2001 19:50:58 -0700 (PDT)
> From: Phil Hunter <ilphayunterhay at yahoo.com>
> Subject: calibrating NBs (was Re: DIY_EFI Digest and EULA)
>
> Clare Snyder wrote:
> [snip]
>
> > I'm looking forward to getting the boards, and
> > hopefully the parts kits, to build the units - one
> > for the aircraft engine project, and the other as a
> > portable test/ diagnostic unit.
> [snip]
>
> For this aircraft app, a couple of thunks occured to
> me, unless you're talking about a turbine, don't most
> all aircraft fuels contain lead? Lead kills O2
> sensors.

This is an auto conversion - planning on running Premium Mogas, at least in the
development stages.
>
> I've heard HEGOs, and I assume the WB sensor (UEGO?)
> since they are heated, can be more tolerant of lead
> if you wait for them to heat up before starting the
> motor, something about lead less likely to stick to
> cold surfaces.
>
> This brings up an idear, howzabout using a WB to
> "calibrate" a NB, then use the NB instead of the WB,
> and dispose of the NB when its fouled? 3-5X cost
> savings. Since it's calibrated, the NB can even be
> used instead of new for further savings.
>
> Perhaps something like a lawn mower engine can be
> used as a simple way to calibrate, make an exhaust
> pipe w/ a couple of "bungs" for the sensors, start
> datalogging and vary the mixture needle.
>
> I've read here that backpressure and EGT can vary NB
> output, so these variables may make this impractical,
> but if you can at least measure backpressure, assuming
> there is any on an aircraft, then you s/b able to come
> up w/ some kind of arrangement in the mower's exhaust
> to vary backpressure accordingly.
>
Not much backpressir with 180 degree headers and a 3 ingh stack on 164 CID.
> phil
> (digest)
>
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