[AT] OT BMEP - Ether -for George Part 1

[George Willer]

Brice,

Thanks for the response... I'm looking forward to part II

I'm not educated enough (high school graduate) to know the proper units of
measurement, but what I really want to know, and I'm sure many others would
like to know as well, is the maximum pressure that can be developed when
ether is used by any method as a fuel.  PSI is a term we are more familiar
with.  Armed with a solid number, we can then start a safety campaign to
halt many unsafe practices... or dispel some old wives' tales.

I've not been able to find useful information in my internet searches, but
it may be because I've been using the wrong units.

If we are comfortable with practices that are really a safety hazard and
shouldn't be, I'd like to hear intelligent arguments to change our  minds.
You may be just the person to find and provide that information.

On the other hand, if we are discouraged from using useful aids because of
superstition and unreasonable fear... I'd like to know that too.

You have no idea how much I look forward to our annual lively discussions.
I eagerly look forward to part II.  I'll follow the links provided to see
what develops.

George Willer

The true test of character is not how much we know how to do, but how we
behave when we don't know what to do.
--------John Holt


----- Original Message ----- 
From: <badams at alcor.astro.indiana.edu>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Thursday, September 09, 2004 12:48 PM
Subject: [AT] OT BMEP - Ether -for George Part 1


>   While I was innocently engaged in the production of shim stock at
> Portland George Willer asked , "What is the BMEP of Ether?" I vaguely
> remembered from a former life some tables with BMEP figures for
> different grades of aviation gasoline so I stifled my first response of
> "Wrong units" and told George I'd see what I could find.
> I found:
>
> 1.Brake Mean Effective Pressure (BMEP)
>     The work accomplished during one engine cycle divided by the engine
>     swept volume. It is essentially the engine torque normalized by the
>     engine displacement. The word ^Óbrake^Ô denotes the actual
>     torque/power available at the engine flywheel as measured on a
>     dynamometer. Thus, BMEP is a measure of the useful power output of
>     the engine
>
> 2.ASTM test procedures for aviation fuels use BMEP extensively for
> expressing operational characteristics.
>
> 3.BMEP is misused to express instantaneous cylinder pressure.
>
> 4. Some fascinating work is being done on diesel engines fueled with
> dimethyl ether:
>
> http://www.portalenergy.com/balpyo/ectw16/08.pdf
> http://www.mhi.co.jp/tech/pdf/e406/e406348.pdf
>
> I did not find a BMEP figure for dimethyl ether.
> See part 2 for "the rest of the story".
>
> Brice
>
>
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