[Red Badger]

Rest In Peace, old friend, your work is finished.....

If you want ON or OFF the DIESEL ”KnOcK” LIST jut FReepmail me..... This is a fairly HIGH VOLUME ping list on some days.....

[Aqua225]

This doesn’t sound practical to me.

(1) Carbon build up will eventually cause pre-det issues with the natural gas being sucked in through the intake stroke, as the engine ages.

(2) Have to put two fuels in your car, granted it won’t be a lot of diesel all told, still annoying.

More practical would be if they had figured out a reliable injector pump design that could inject CNG into the cylinders at the required pressures for diesel ignition of natural gas. That is probably a very tough problem though... mechanically speaking. Also, increasing engine robustness while reducing weight, to handle the higher compression ratios required (ethanol takes 23:1, I’d expect natural gas to be somewhere between ethanol and diesel... have not looked this up).

[Jack of all Trades]

I worked on partial Propane injection for a while about 10 years ago.

A sensor that measures pressure in the cylinders plays a key part...

...aaaand there's one of the major technical hurdles, at least as I'm aware of. I haven't looked into it in a while. That pressure sensor is going to see on the order of 100 million pressure cycles over the life of the engine. That's a lot.

[saminfl]

This corresponds to fuel consumption of less than 2.4 l per 100 km.

2.41 what per 100 km?

[norwaypinesavage]

It doesn’t look to me like they’ve solved an important issue in natural gas-diesel engines. Surprisingly, it’s soot. Liquid fuel disperses quite evenly in a diesel combustion chamber. Gas doesn’t disperse evenly. This leaves pockets of gas rich zones which have insufficient oxygen, and create soot. You know, the black stuff you see coming from diesel trucks when they accelerate. It seems like some in the “Green” community don’t like this.

[varmintman]

There are several new kinds of IC engines in the wings, two of which are unusually interesting:

http://www.angellabsllc.com

http://ecomotors.com

[Yo-Yo]

Researchers at ETH Zurich have developed an internal combustion engine that emits less than half the CO2 compared to a regular engine without compromising performance.

And in a world where CO₂ emissions don't matter because AGW is no longer an issue, we need to concentrate on the highest possible efficiency, regardless of the CO₂ levels.

Lowering CO and NO_X I can understand...

[slumber1]

Hybrid?

Cummins Heavy-Duty Natural Gas Truck Engine is already on the market and Clean Energy Fuels is building a series of LNG fueling stations across the US Interstate highway system. Who needs a hybrid?

[justlurking]

the researchers were able to achieve a highly efficient combustion with a maximum efficiency of 39.6%.

Is this a big jump? I thought the average for an internal combustion engine is 18-20%.

But, I'm finding claims that with direct injection, gasoline engines can get as high as 35% and diesel engines as high as 40%.

[Squantos]

My goal is rollin coal.... Black smoke from my cummins irritates the hell out of Prius drivers for some reason.

We do have a TDI Veeeee DubYa Passat that gets great mileage . Actually hit 50mpg once, going down hill in a tail wind but average about 43mpg if we keep our foot easy on the pedal.

Sure wish EPA was never invented (jimmy carter sucks duck eggs) .... Some really nice turbo diesels across the pond that get 50+ mpg all the time and they can scoot to boot. The technology exists... Bring it here yesterday !

Stay safe Red Badger ! Thanks for the ping .

[Chickensoup]

I have a new golf diesel. Is it the diesel engine?

[KYGrandma]

Ford had natural gas engines until about 10 years ago.

[ROCKLOBSTER]

Researchers at ETH Zurich have developed an internal combustion engine that emits less than half the CO2 compared to a regular engine>>>

Big whoop, what the hell difference does that make?

"Anthropogenic global warming" is a hoax, and since there hasn't been any warming for 19 years...the whole thing is a hoax.