[Vwdiesel] Honda Diesel

[James Hansen]

Oh, man, I know.  Diesel makes the world go round, but gas drives those that
think the world revolves around them.

To an end user (me for instance), it would seem that great pains have been
taken to improve air quality almost solely at the sacrifice of efficiency...
to the tune of about a 12 TO 25% increase in fuel usage moving from tier 2
to tier 3 compliance in ag engines.  Pretty much the same for other on and
off road users with a wide variability in how the increased costs get passed
on.  Now that we are in tier 4 transitional compliance, different technology
is being used (urea) which should bring fuel efficiency back up... maybe for
some anyway (not JD).  But no matter how you look at it, efficiency is
certainly not high on the want list of the rule makers.  Kind of like
natural selection, if you don't select for it, you don't get it, and nobody
in the north american engine market has been big on efficiency because it
all hangs on nitrogen emissions. Some players have a lot of European
exposure, which influences their engine design quite a bit it would seem.
(fiat group- case, NH, etc)

Reasons vary, but mainly it was using EGR.  It's like we are now replaying
the "smog rules" engines cars used in the 1970's in offroad engines.  They
use EGR to keep the combustion chamber cool to not make NOX compounds, and
surprise surprise, you have to use more fuel to get the same power. I
distinctly remember the parents 1978 bronco that made a whopping 8mpg
IMPERIAL right out of the box. You could quite easily confuse the
speedometer with the gauge for the enormous fuel tank, both moved in
concert, but different directions. 

At least those that are now using urea cat in tier 4 engines are able to
bump timing and durations with high boost to get really hot combustion, hot
combustion chambers make more efficient power, it makes the particle trap
work better too, then fix the nox with a urea cat.  Overall efficiency is
much much higher.  Guys that I know that have bought the 350K new tractor
are quite happy with them- they HAD to get rid of the fuel guzzler tier 3
junk that it replaced.  A big acre farmer can make a tractor payment on the
difference in fuel use between tier 3 and 4 transitional engines.

I wonder Travis, since the EPA has been used as a trade manipulator for so
long with air quality being the saw, if they would know what is good for the
environment even if it jumped up and bit them in the ass. Personally, I kind
of doubt it, it's still more enviropolitics than good intelligent use of
resources in some kind of sustainable manner.
-james

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of Travis Gottschalk
Sent: January-31-12 11:42 AM
To: vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] Honda Diesel


You mean all the "verage fuel efficiency decreasing in ag equipment -
various politico-environmental reasons" isn't good for the environment? I
always wondered how is it that they seem to think that more cleaner (but not
completely clean) air/fuel is better then a little "dirty" air. Isn't being
truely "green" just making things more efficient? It has to be self
sustaining. Also as to the fuel in the US-just because there isn't a lot of
cars that burn diesel there is plenty of ships, trains, Heavy equipment
(mines, road construction) and over the road trucks. There is more Diesel in
the US then you think and the funny thing is because it is more effecient
then gas. But the individual consumer still chooses gas. 
 
	 	   		  
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