[V8] Audi Engines

[qshipq at aol.com]

 I spoke extensively with a close friend who is a new product development engineer for GM this past summer, and is involved in what you guys speak of in gas engines, technically referred to as Homogenous Charge Compression Ignition (HCCI).  He claimed it's running now with todays' technology and common available fuels E85>93, and mass production is likely 6-10years out using today as the benchmark.  His take:  What you will see is a gradual integration of this tech eventually evolving into the full HCCI engine, which has several advantages to both emissions output and mech/therm efficiency.  It also will eliminate the starter from the engine all-together (something BMW has already developed).  I would expect Audi/BMW/Mercedes to advance this as well, and Audi is probably best experienced to integrate it, based on their tdi experience.

I know having discussed the 2 stroke after-run and Wankel Engine tech in this regard with my late father (Senior GM Research Engineer) back in 1979.  At that time, the understanding of HCCI was complete, the technology not available.  Without question it will come to production engines, as the gains in emissions is beyond significant.

Scott J

 


 

 

-----Original Message-----
From: Tony and Lillie <tonyandlillie1 at earthlink.net>
To: Scott DeWitt <sdewitt at stx.rr.com>; V8 <v8 at audifans.com>
Sent: Wed, Dec 1, 2010 1:23 pm
Subject: Re: [V8] Audi Engines




Chrysler had developed a "hybrid" gasoline engine in the early 00's (or 

maybe late 90's), IIRC. I'd have to find the article. However, the engine 

idled and ran low throttle on compression ignition, and full throttle on the 

spark plugs, I think. It was a pretty neat idea, but as you mentioned, it's 

hard to do. It was deemed too complex to put into production, and variations 

in gasoling octane and quality would have a significant affect on the engine 

when runnin in compression ignition mode. It was also stated that the engine 

was pretty noisy when firing on compression.



Tony

----- Original Message ----- 

From: "Scott DeWitt" <sdewitt at stx.rr.com>

To: "V8" <v8 at audifans.com>

Sent: Wednesday, December 01, 2010 1:18 PM

Subject: Re: [V8] Audi Engines





> It's doubtful that a compression ignition gasoline engine will ever be 

> developed. Gasoline doesn't lend itself to be spontaneously ignited in a 

> controlled manner such as a diesel engine.

>

> Long time ago in the early 90's VW did develop a direct injection gas 

> engine with an absurdly high compression ratio (14:1) however it still had 

> a spark plug.

>

> IIRC one of the more recent incarnations of the BMW V12 used valve lift to 

> control throttle, and netted a substantial gain in engine efficiency, and 

> this was nearly 10 years ago. Mercedes even has a camless engine now, 

> valves are now activated by electric solenoids.