[Vwdiesel] How different is this from a VW turbo pump?

[Andrew .Libby]

It's quite a bit different from any of them.  The electronic TDI pumps are
obviously completely different.  That eBay pump has a 20mm shaft instead of
the 17mm shaft of the AAZ or 1.6TD.  The shaft is the length of the 1.6TD
pump (AAZ shaft is longer).  There is not any stock VW sprocket that fits
the shorter shaft (all the VW 20mm sprockets fit the longer shaft).  That
eBay pump does spin the right way and the accelerator lever rotates the
correct way.  Internally it is also quite different.  The dynamic advance
spring gives a very different advance curve, the advance piston is
different, the governor spring setup is a single un-caged extension spring
and limits the rpms to approx 2500.  The camplate has MUCH higher lift and
is much steeper.  The LDA lever is on the side opposite that of the VW LDA
lever.  The delivery valves are the longer length which fits only the 90-97
1.6 and AAZ pumps.  There is no cold start advance accommodation.


On Fri, Nov 9, 2012 at 8:43 PM, <dieseltdi at verizon.net> wrote:

>
> http://www.ebay.com/itm/New-Bosch-Cummins-4BT-Turbo-Diesel-Fuel-Injection-pump-injector-3-9-/281016897916?pt=Motors_Car_Truck_Parts_Accessories&hash=item416de9917c&vxp=mtr
>
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