[Vwdiesel] Timing

[HWY9FERGS@cs.com]

In a message dated 9/16/2005 3:10:38 PM Pacific Daylight Time, 
vwdiesel-request at vwfans.com writes: 
> Hey Ferg,
> 
> After 2 years hillbilly tuning, I put a dial indicator on the pump just to 
> see where she ended up: one point one millimeters before TDC. This car is my 
> daily driver used mostly for high speed operation. As Hagar says, this timing 
> is for my car only (91 Jetta 1.6 N/A); another may be different. My 81 pick 
> up (1.6 N/A) finds this timing (1.1 mm) to be too far advanced. For the pick 
> up I ended up at one point oh. A good indicator of timing accuracy for any 
> given engine: on a cool morning - say about 20 degrees F - if your motor starts 
> and runs well without pulling out the advance knob, then you are probably a 
> bit too advanced. This is my experience.
> As for timing advance: this is controled by pump internal pressure which 
> goes up with pump RPM to a certain point &is then relieved by spring plunger 
> like an oil pump. The mechanical pumps work this way; I really have no knowledge 
> of the TDI or common rail systems. 
> Hope this gives you a starting point to play with.
> 
> Bob in the Entire State
Thanks very much Bob, that's just the sort of info I can work with.  I'm glad 
you had that handy.  Doug