EngEd@aol.com wrote:

Hello, Paul,
   Ha.
   Vis-a-vis getting "your ballot box stuffers mobilized in time," I rest my
case for a short voting period.
   Regards.
   Dennis

BTW April 04 issue. Melting snow is not evidence of global warming. Only if it is getting
warmer everywhere there is no snow :) I agree. Europe is in denial on the diesel
having just talked to some automotive engineers at the Geneva show.

Hi Paul.  "In denial on the diesel..."  ??? Please explain.

dave
mailto:dave@arb.net
http://arb.net

They still are not convinced it causes cancer. When you accelerate a diesel engine 
the first thing that happens is a much richer mixture. This causes smoke or
cancer causing particulates. If it does not go rich it does not accelerate.
The air intake is already wide open. It is always wide open.
Diesel's control the speed by controlling the amount of fuel injected not the 
amount of air. That is how you make a diesel engine accelerate. When you see a diesel 
truck smoke that is what is happening. The driver just floored the accelerator 
pedal.

With a gas engine the first thing that happens is it wants go lean but the 
computer can keep up and keep the mixture in the proper range. Gas engines 
speed is controlled by throttling the air. This is a fundamental difference 
between the gas engine and the diesel engine. Several devices have been developed
to mitigate this diesel particulate problem. What is universal used now on 
European car diesel engines is this variable vane turbo charger. This causes 
the turbo to speed up faster attempting to supply enough additional instantaneous 
air to keep up with the richer mixture so to speak. Another device is an electric 
motor boosted turbo charger as used on the RX8 hydrogen powered car.

Paul Lamar
 
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