[Vwdiesel] Brakes --- engine brakes -- ( The physics of it ).

[Lee Hillsgrove]

  I've got to disagree with a few points here.

 The main cause of heat generation in an injection pump, as I see it, is the
diesel fuel leaking past the high-pressure section to the low pressure
return. Where I used to work, we used a bunch of axial piston pumps, and the
very first suspect when a unit was running hot was leakage past the pump
pistons, evidenced by a higher than normal case drain flow. It would be
180°F+, too!

 The injection pump does not turn a little faster than the engine - it turns
at exactly half speed.


  Lee
  Oo-v-oO
  PP-ASEL
  KB1GNI



----- Original Message -----
From: "H.Hagar" <h_hagar at prcn.org>
To: <vwdiesel at vwfans.com>
Sent: Tuesday, January 06, 2004 2:23 PM
Subject: [Vwdiesel] Brakes --- engine brakes -- ( The physics of it ).


The bosch pump is an amazing retarder ---- 4 flyweights thrashing around in
fuel,  lots of
power loss. Turning at slightly faster than engine rpm.--so going down that
hill with 5k
on the clock   the weights fly around at 5000 plus. That's what heats up the
fuel in wintertime.
(and summertime).