GM unveils diesel-like gasoline engines

[Telco]

Nice looking concept. Think I'll wait to pass judgement on it though. Too bad Gramps didn't have access to the technology we have today, otherwise he might have been able to make it work. Sodium filled stainless exhaust valves, for example, are almost impossible to burn in an ICE unless you are just trying, might have worked fine for this.

[cfg83]

rh77 -

Originally Posted by rh77

I agree, they played the audience quite often -- and tended to repeat footage on subsequent episodes. But nevertheless, it was a neat view into this little-known industry.

Hugh was probably showing off for the camera 99% of the time -- we've all met guys like that -- frankly, I think he came off as an arse. He didn't take care of his employees -- as you said, he could've had Rick stay on with a simple heater repair.

My fav's were Jay and Alex: they had the most honest personalities of the bunch.

I hear there's going to be a Season 2, so that's cool

Ooooooooh, looky looky!

Sunday September 2nd - 09:00 PM - Ice Road Truckers: Off the Ice
http://www.history.com/schedule.do?a...e=EST&x=14&y=7

The truckers look back at their experiences during the last ice road season and explain what they do now that they're off the ice. Tensions are sure to be high as both Rick and Drew have not spoken to Hugh since leaving the ice roads prematurely. T.J., the rookie, has had time to reflect on his time up north and will discuss whether or not he'll be back up on the ice roads next year. Alex and Jay, full-time residents of Yellowknife, are sure to have some thoughts on how the locals feel about the spotlight that has been shined on their small town.

Sounds like a catfight.

CarloSW2

[repete86]

This sounds like another GM publicity stunt. I doubt that they will ever release it.

[cfg83]

Hello -

Here's an update :

Non-Hybrid Aura Prototype Delivers Higher MPG with New Technology
SaturnFans.com ? September 30, 2007
http://www.saturnfans.com/Cars/Futur...rototype.shtml

Engine experts have dreamt about it, talked about it and lectured about it, and today ? for the first time ? General Motors is letting outside parties drive the "most awaited advanced combustion technology" of the past 30 years.

GM demonstrated the combustion process, known formally as homogeneous charge compression ignition, or HCCI, for the first time in two driveable concept vehicles, a 2007 Saturn Aura and Opel Vectra. When combined with the enabling advanced technologies such as direct injection, electric cam phasing, variable valve lift and cylinder pressure sensing, HCCI provides up to a 15-percent fuel savings, while meeting current emissions standards.

...

Highlights of HCCI technology include:

* Diesel-like engine efficiency with substantially reduced after-treatment cost
* Builds off proven gasoline direct-injection and variable valve actuation technologies
* Adaptable to conventional gasoline engine architectures
* Requires only conventional automotive exhaust after-treatment
* Compatible with all commercially available gasoline and E85 ethanol fuels.

How HCCI Works

An HCCI engine ignites a mixture of fuel and air by compressing it in the cylinder. Unlike a spark ignition gas engine or diesel engine, HCCI produces a low-temperature, flameless release of energy throughout the entire combustion chamber. All of the fuel in the chamber is burned simultaneously. This produces power similar to today's conventional gas engines, but uses less fuel to do it. Heat is a necessary enabler for the HCCI process, so a traditional spark ignition is used when the engine is started cold to generate heat within the cylinders and quickly heat up the exhaust catalyst and enable HCCI operation. During HCCI mode, the mixture's dilution is comparatively lean, meaning there is a larger percentage of air in the mixture. The lean operation of HCCI helps the engine approach the efficiency of a diesel, but it requires only a conventional automotive exhaust after-treatment. Diesel engines require more elaborate and more expensive after-treatment to reduce emissions.

Attachment 962

CarloSW2