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blueflame 02-09-2009 08:50 AM

World’s cleanest internal combustion engines?
PSA Peugeot Citroën has sold more than 3 million HDi diesel engines fitted with a Diesel Particulate Filter

PSA Peugeot Citroen - You are journalist -

More info on particulate filters:

3 000 000 ème - Filtre A Particules - anglais

blueflame 02-10-2009 05:09 AM

yeah just more froggy crap

NeilBlanchard 02-27-2009 09:31 AM


I think that this engine design has a legitimate shot at being the cleanest, simply by virtue of it's superior efficiency: 39.5%

RobertSmalls 02-28-2009 11:16 AM

The most efficient ICEs today are very, very large engines, such as this 25000 liter two-stroke turbo diesel ship engine with ~50% thermal efficiency. I would guess that large, stationary diesel generators are also efficient, since weight isn't much of a concern and they can add waste heat recovery systems, etc.

Or if by "cleanest", you mean you'd survive the longest while locked in a garage with one running, I'd go for the Honda 1.0L 3cyl that came in the Insight with CVT. I don't know of a car with lower NOx, CO, and HC emissions.

Cd 02-28-2009 03:54 PM


Originally Posted by blueflame (Post 87156)
yeah just more froggy crap

Huh ? That slipped past me. What is 'froggy' crap ?

Cd 02-28-2009 04:01 PM

I saw a show a few days ago about trains.
I was surprised to see that miners use small underground trains that run on diesel.
The engines have a particulate filter that filters the exaust so well that there are practically no emissions at all.
At first, I wondered how this would work on a street car, but then realized that the fuel economy and acceleration would be horrendous.
It looks like it is possible in the article above though.
It's good to see someone sucessfully using the filters on cars.

RobertSmalls 02-28-2009 08:13 PM


Originally Posted by Cd (Post 90150)
Huh ? That slipped past me. What is 'froggy' crap ?

Citroens are French cars, and "frogs" is a derogatory term for the French.

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