In the diesel parlance:

"indirect injection" means injecting into a small pre-chamber which is vented into the remainder of the combustion chamber.  Old technology, but very well tested and durable.

A "direct injection" diesel has no pre-chamber.  Direct injected diesels are typically more efficient but much louder.

The newer "common-rail direct injected" diesels use extremely high pressures and fine nozzles to ignite the fuel more slowly thus reducing the knock.  Usually the fuel is injected in several spurts.  A very small leading pilot squirt quietly gets the charge hot enough to efficiently burn the following spray as it comes out.  This further reduces the tendency for the fuel to explode all at once.

...Alan

-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of DJMurray
Sent: Tuesday, May 25, 2004 2:38 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:EFI Controller


I thought ALL diesels were "direct inject"!!!!!! If you didn't direct inject, how on earth would you control the timing of "ignition" (flashpoint of the fuel)!!

FYI! ;-)
Dennis

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