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01-20-2007, 02:06 PM

jobst.brandt@stanfordalumni.org wrote:

> It is at the low partial power range that most automobile engines are
> operated and it is there that the diesel achieves its fuel economy.
> We don't drive with the pedal all the way, or even half way down to
> the floor, and that is where fuel economy shows up in the diesel.
>
> http://hyperphysics.phy-astr.gsu.edu...ermo/otto.html
> http://tinyurl.com/3xa48n http://auto.howstuffworks.com/diesel.htm
>
> To make up for that, I have seldom been in a diesel car where the
> owner didn't mention that the car is much smoother running than the
> older ones... but you can usually notice it or the subject wouldn't
> have been mentioned. The Germans have the best description of it:
> nageln and klingeln... driving nails, and bell ringing, quite aside
> from the vibration at low speed caused by a 20:1 compression ratio.

So if low vibrations are on top of your list the rotary engine comes
into play again. Sorry, could not resist, but I wonder if you had the
opportunity to drive an European car with one of the more recent Diesel
engines by Peugeot/Citroen or Volkswagen. They really do have much
improved and are very easy and nice to drive with high torque at low
RPM. It is not just fuel economy and lower fuel taxes for Diesel in
some countries but also the contentment of drivers that have led to a
market share of Diesel cars in Europe that already results in problems
for the petrol industry to produce the right mixture of Diesel and
gasoline. But until now your huge SUV's with low mileage take up the
extra gasoline :-)

x'post rec.bicycles.misc,rec.bicycles.tech
follow up to rec.bicycles.tech

Günther

01-20-2007, 02:06 PM	#107 (permalink)
Günther Schwarz Guest Posts: n/a	Re: OT Interesting video jobst.brandt@stanfordalumni.org wrote: > It is at the low partial power range that most automobile engines are > operated and it is there that the diesel achieves its fuel economy. > We don't drive with the pedal all the way, or even half way down to > the floor, and that is where fuel economy shows up in the diesel. > > http://hyperphysics.phy-astr.gsu.edu...ermo/otto.html > http://tinyurl.com/3xa48n http://auto.howstuffworks.com/diesel.htm > > To make up for that, I have seldom been in a diesel car where the > owner didn't mention that the car is much smoother running than the > older ones... but you can usually notice it or the subject wouldn't > have been mentioned. The Germans have the best description of it: > nageln and klingeln... driving nails, and bell ringing, quite aside > from the vibration at low speed caused by a 20:1 compression ratio. So if low vibrations are on top of your list the rotary engine comes into play again. Sorry, could not resist, but I wonder if you had the opportunity to drive an European car with one of the more recent Diesel engines by Peugeot/Citroen or Volkswagen. They really do have much improved and are very easy and nice to drive with high torque at low RPM. It is not just fuel economy and lower fuel taxes for Diesel in some countries but also the contentment of drivers that have led to a market share of Diesel cars in Europe that already results in problems for the petrol industry to produce the right mixture of Diesel and gasoline. But until now your huge SUV's with low mileage take up the extra gasoline :-) x'post rec.bicycles.misc,rec.bicycles.tech follow up to rec.bicycles.tech Günther