[Diy_efi] DIY-WB and methanol

[Garfield Willis]

On Wed, 9 Oct 2002 13:45:58 -0700, "Derek" <derek_obanion at yahoo.com>
wrote:

>I have a US DIY-WB on it and it works great. I haven't seen the readings=
 thrown
>off when the methanol starts spraying, even when I was running a 50/50 =
mix of
>methanol and water. I have been delivering up to the same volume rate as
>gasoline. No sudden jump in the ratios when the mix hit the motor. The =
AFRs
>matched up exactly with what I expected, based upon my previous AFRs and=
 the
>volume flow I was using. But now that I'm switching to pure methanol, I =
think if
>there was even a little inaccuracy before, it will be even less of a =
issue now.

Well, you know what they say, you can't argue with 'experience'. :)

But think about what you're saying. You replaced up to half your petrol
volume with a 50/50 mix of methanol (which has a stoich AFR of 6.5, well
below half of petrol), and liquid water, which especially when expanded
to water vapor in the exhaust is a MAJOR diluent of the total exhaust
gas components (seriously dilutes the partial pressures of the things
the O2 sensor is sensitive to), and yet is inert to the sensor. And
there was no 'sudden jump' in the *indicated* AFR. I hope you understand
what you're saying (or seeing).

Plus, I take it the last sentence above says that when you switch to
pure methanol (total fuel stoich AFR now at more than HALF of petrol),
you expect to see even "less inaccuracy"? Did I read that right? IOW,
you're saying that if you switched from straight petrol, to a 50% 50/50
mix of methanol+water, and didn't see much of a change in indicated AFR,
then when you went to straight methanol, you'd expect even LESS of a
change in indicated AFRs?

Wow. OK. No sense in arguing with a true miracle. This one's for Mother
Teresa, not me.

Gar


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