[Vwdiesel] Injection pump for beginners ---( the LDA -thingy )

[Charlie Smith]

Earlier, LBaird119 at aol.com wrote:
> 
> > He was working on a v-8 powerstroke engine.  He showed me the 
> > pistons.  Large melted lumps of metal.  It left an impression 
> > on me.
> 
>   I know Dad or my uncle talked to a place that put turbos on the earlier 
> Fords.  He said he could set the pump up hot enough that by the time 
> you reached the top of the hill (about a mile and a half and a couple 
> hundred feet up, maybe) the engine would be melted down.  Sounds 
> like he was serious!
>      Loren

A couple of comments.  First, I've got pages from a Bosch Diesel
Fuel Injection book about the VE pump here on these web pages:

    http://www.elektro.com/~charlie/vwdiesel/

The book is ISBN 1-56091-542-0, published in 1994 and now out of print.

Second, I suspect the Ford meltdown was caused by the same problem
we can get ourselves into with the VE pump.  Putting more fuel in, 
means the period of injection is longer.  If the point where injection
stops is so late that the fuel is still burning when the exhaust valve
opens, the exhaust temperature will go through the roof.  This is 
because you've got still burning gases going out into the exhaust.

In our case, the answer is to advance the pump timing so the burning
stops before the exhaust valve opens.  All this means, that if you are
playing with the pump and boost, you HAVE to have an exhaust temperature 
gauge!

    - Charlie

  Charlie Smith  charlie {at} elektro.cmhnet.org  614-471-1418  
  http://www.elektro.com/~charlie          Columbus Ohio   USA
  http://www.elektro.com/~audi         photos & technical info

  95 S6 Quattro  -  24 PSI, RS2 6 speed, and other features  
  97 Dodge Ram   -  40 PSI, 4x4 w/Cummins turbo diesel