[Vwdiesel] (off) Ford Tractor Diesel

[LBaird119 at aol.com]

> thanks for explaining the 'more work but smoother so
> less instantaneous loads.' i don't understand why that
> would be, but at least it would explain things.
> 

  That's just sort of a guess but if it rattles less, and most TD's do, 
then that means the pressure rise is smoother so thus less shock/
smoother power transfer to the crank.  Of course the cranks don't 
usually cause problems with these but the upper half of the rod 
bearing can show it.
  With a diesel, fuel = heat.  Gas don't quite always follow that simply.  
More fuel = hotter EGT, more air = cooler EGT.  "Boltt on" a turbo and 
you increase the air a BUNCH.  EGT goes down, power goes up a little, 
soot goes down so internal/potential internal wear goes down.  Valves 
gunk up less so run cooler in addition to the cooler temps.   THEN you 
turn up the fueling to take advantage of the increased air. Bring the EGT 
back where it was, soot still tends to be a little lower.  EGT is still lower 

 than before except under full load.  Stress to the engine isn't really that 
much if any higher but output is higher.  The bottom end is generally 
enough over-engineered to handle a lot of power increase without incident.
  NEXT bolt on an intercooler.  Over about 6 psi and the temps really 
drop with a good one.  You get about a 1:1 drop in EGT for drop in 
intake temp.  At 10 psi our VW's are around 300F+!!!  Temp drop = higher 
air density, means more room for fuel.  More fuel, more power and EGT 
is back where you started with the NA engine but still even cooler under 
non full load conditions!  :)  The fuel increase is why you need the 
pyrometer.  
Without it, you could easily turn the fuel up too high and make aluminum 
start disappearing from the pistons/engine.
     Loren