[V8] Audi Engines

[Tony and Lillie]

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.