[Diy_efi] WI, methanol, and corrosion

[Greg Hermann]

At 9:12 AM 1/24/03, Bernd Felsche wrote:
>On Thu, Jan 23, 2003 at 01:39:27PM +0100, Axel Rietschin wrote:
>> From: "Marcell Gal" <cell at x-dsl.hu>
>
>> > > the combustion chamber. This excess water will not evaporate fully in
>> > > the throttlebody because the intake charge is already at its dew
>> > > point and the excess will remain in suspended liquid form.
>>
>> Even a little water evaporation (before it enters the cylinders)
>> will displace _some_ oxygen and this is a bad thing.
>
>Typically between 0.1% and 4% of the air can be water vapour under
>atmospheric conditions... After that, it's off to the steam tables!

You need to be off to the steam tables before you even think about
evaluating the comments I have made on this--- :-)
>
>Although reducing the amount of oxygen correspondingly is generally
>a "bad thing" because the power potential is reduced, the water
>vapour may allow more aggressive ignition timing resulting in a
>greater increase in torque to offset the loss in potential power.

I will say again--If the saturated vapor pressure of the water evaporated
to cool the inlet charge adiabatcally to a given temp is LESS than the
pressure drop that would occur across an IC that would cool the charge to
the same temp--you will have a net GAIN in overall volumetric efficiency
and power--WITHOUT even considering or adjusting the timing/anti-det/fuel
economy aspects of the deal.

Greg
>
>--
>/"\ Bernd Felsche



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