[Vwdiesel] stuck stick in cylinder & Engine refresher: Thoughts?

[LBaird119 at aol.com]

In a message dated 12/12/2011 11:43:49 P.M. Pacific Standard Time,  
tgott at hotmail.com writes:

But it  is true about the cup in the TDI piston that basically acts as the 
prechamber  for lack of better terms on the IDI's. It helps contain the 
explosion of the  fuel and hence the knock of the diesel is less for this style 
of engine.  




I wouldn't put it quite that way.  Maybe I'm wrong here but the  purpose of 
a 
prechamber, IDI, is to make a quieter idling engine, mostly.  The dish  in 
the 
piston isn't so much to replace the prechamber, it's the combustion  
chamber.  
The shape is to make the best mix of the air/fuel in the cylinder.   Same 
for the 
spray pattern and angle of the nozzle used.
 
  The newer diesels (one of the first to incorporate it was the TDI)  use 
multiple 
injections per injection cycle, to make the engine quieter.  I believe  VW 
uses 
two bursts, a light one to start ignition slowly (to greatly reduce the  
sudden 
pressure rise knock) then the main injection.  I forget which engine I  
read about, 
that uses 5.
     Loren