[Vwdiesel] 1980 Rabbit Yellow Dot Pump.

[LBaird119 at aol.com]

In a message dated 10/17/2011 7:07:09 A.M. Pacific Daylight Time,  
mark at shepher.fsnet.co.uk writes:

Still  trying to find out more re this funny pump. 
I know it was a 107A but was  it not coded further other than a splodge of 
paint, so that not all 107A's are  yellow dot?
Why did Bosch not stamp the pump if this is the case?  

It's internal pressure to rpm gradient was steeper that other pumps,  and 
the advance spring was apparently a softer 'green' one adding to the  
hydraulic advance, then there is the strange rumour on the GTD sit of  requiring 
180bar injector break pressures to compensate for the 1.15mm  advance. I think 
this is mere hope than fact.

Was there an EPA fuelling  issue around 1980, or indeed change of fuel, or 
an attempt at a performance  upgrade? THat would be in brochures wouldn't it?
Any owners of OEM stuff  out there. Did the handbooks cover this issue  
with a change in economy?  




AFIK, all the 107A pumps are yellow dot.  Most 1980 Rabbits  seemed to have 
them. I think some '79's may have but I never saw an '81  with one (1.5 
only).  The earlier ones timed at .88mm then the jump to the  1.15mm with the 
yellow dot.  Always thought the use of a splotch of  "wrecking yard" paint 
was an odd way to identify the series of a car's  component!
  My guess would be that they went to that pump, for better  performance, 
but then for some reason, they found it unacceptable for the 1.6  engine, so 
stopped use of it.  There was some year where no US destined car  could have 
a speedometer that read over 85mph (yes even Ferrari's) but that  shouldn't 
have anything to do with it.  The cars could still go faster,  just had to 
do it with the speedo pegged.  Not like there was any fear of a  diesel 
Rabbit going faster than 85mph anyway!
     Loren