I worked as an engineer for the Ford / VW Joint Venture in Brazil about 10
years ago, on the production cars running on pure alcohol (well, not really
pure -- about 96% ethanol / 4% water and junk).
The cheap cars at the time ran single-point, throttle body injector systems.
Even in warm weather, this really pointed to a big difference between
ethanol and gasoline. Ethanol vaporizes at a single temperature (around
140F, IIRC) while gasoline contains a range of fractions that vaporize along
a curve of temperature, say from 120F to 300F or so.
The end result is a liquid puddle of alcohol in the intake manifold of a
cold engine that all vaporizes suddenly as the engine warms up past a
certain point. Difficult to calibrate for, and you end up with rich engine
conditions, stumbling, and high emissions. I would think that even with
port fuel injection this effect may manifest itself in cold weather
conditions. Probably why you generally see E85 max in the US.
-- Rob
Northern Michigan
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, June 22, 2005 8:11 PM
To: Biofuel@sustainablelists.org
Subject: RE: [Biofuel] Brazil's ethanol effort
Assuming that the problem in cool conditions is fuel vapourization and
mixture formation, I expect that inlet injection (fairly common now)
would work, and that if it didn't, direct injection would work.
I don't know how ethanol and injection pumps get along, but I think that
if there is a problem it could be beaten.
Doug Woodard
St. Catharines, Ontario, Canada
On Wed, 22 Jun 2005, DERICK GIORCHINO wrote:
> I have recently done some reading on the ethanol as a fuel of choice. But
it
> seems that those in tropical climates have an advantage. It seems that gas
> engines run better and start in a hotter climate. And those of us that
live
> in a varying climate could have some difficulty with ethanol in the colder
> time of year. Do you think I am wrong? What is you opinion.
[snip]
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