[Vwdiesel] What a LDA...Aneroids!

[Mark Shepherd]

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Tyler... here is an extract (from Roger Brown's extensive collation of
information on the VW engine) with regard to the aneroid or LDA which
demonstrates the misnomer of 'fuel limiter'..."The distributor type BOSCH VE
fuel injection pump was chosen and adapted with a boost pressure controlled
full load stop (LDA), The working principle is assumed to be well known. The
maximum fuel delivery is 0.0365 cc per stroke at full load at which injection
timing is varied by 8 degrees of cam angle. Injection timing is set by
measuring the position of the distributor plunger when the cylinder one piston
is at top dead center. The distributor injection pump with LDA is shown
schematically in Figure 13. The LDA determines the fuel quantity in the middle
and upper engine speed range, corresponding to the boost pressure level. At
very low engine speeds the LDA is not operational because the boost pressure
is not sufficient to overcome the spring preload.
When the control pin moves vertically, the stop lever rotates and the control
plate is pushed in the direction of greater fuel delivery, i.e. to match the
increased charge air quantity. In case of a failure of the turbocharger, the
base ratting becomes effective, resulting in smoke free combustion.
The main quantities which define the specifications of the LDA can be found in
Figure 14. The rated full load speed is 2250 rpm. The high idle speed is at
2550 rpm."

...the missing diagram simply shows a straight line graph... of fuel increase
with boost (inlet air pressure) increase.

All that aside; isnt the exhaust gas turbo a wonderful invention....all that
extra 'engine capacity' on tap when required....marvellous....up in the north
of the UK there is a saying..."You don't get owt fer nowt"...this is pretty
close!

Hagar I still feel that annealing those EZee Outs...should be as easy as
'dunking biscuits' in my tea...a long dip, or a 'quicky' in water or oil or
sand?...I've certainly done it with cheap screwdrivers with some improvement!
Keep the craftsmen alive!

Mark(the Miser)UK "If I can bend it or stick it together, I will!...
Blood from a stone; I do it daily!"

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===References:===
  1. http://g.msn.com/8HMWENUK/2752