[Diy_efi] DIY-WB and methanol

[steve ravet]

"Geddes, Brian J" wrote:
> 
> Good info.  What if we take the nitrous out the equation, and talk about
> just injecting extra fuel of a type other than petrol?  Propane, methanol
> and good old denatured alcohol seem to be the popular applications I've seen
> floating around recently.  From an off-the-cuff-been-years-since-chem point
> of view, it seems to me that propane (being a petroleum derivative) would
> have a pretty minimal effect on readings.  Denatured alcohol and methanol
> might muddy things up more, since they're not as "chemically similar".

I don't know if there's an easy way to answer that.  There are a lot of
"things" in the exhaust stream, some of which the O2 sensor is sensitive
to in varying amounts.  The mix that is typically present for gasoline
gives the curve for the Honda sensor.  Anything that comes in the top of
the engine that changes the relative mix in the exhaust will have some
effect on the sensor's output.

Maybe it's possible to find (in the literature) or measure the sensor's
relative sensitivity to these various components.  Then if you can
estimate what's present in your exhaust you might be able to combine the
individual curves into a composite for your fuel.

--steve


-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com

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