depronman
A2OC Donor
Tonight, after some discussions through today with Andrew, I modified the Audi 'Spacer' fitted between the EGR and the ASV to allow the far superior Bosch Tandem pump to be used on the BHC / ATL engines
The Bosch pump technically only fits the AMF engine, the BHC and ATL were always fitted with the far less reliable LUK tandem pump. However the Bosch pump does fit the BHC / ATL engine, but the ASV (anti shudder value) fitted to the BHC / ATL engine is electrically operted and as such is far bulkier then the vacuum operated ASV on the AMF engine. This causes a clash on of the ASV with the Bosch Tandem pump on the BHC / ATL engines
A solution was found by another member on A2OC which is to utilise TWO of the spacers which Audi fitted between the EGR valve and the ASV, by fitting an extra spacer the ASV is pushed around 60mm towards the passenger side and as such clears the Bosch Tandem pump.
However there is a couple of problems caused by this modification -
1) the ASV is rotated by around 45 degres
2) the movement of the ASV to the passenger side means that the rubber elbow is bent for accutly which is not ideal
The solution I came up with is to cut the second spacer into two halves, so you have effectively two flanges with stubs of tube attached.
Then turn the outside diameter of one of them, down to 47mm Diameter by 12mm long
Then on the other half turn a bore 47.1mm diameter by 12.25mm long
The two parts will then fit together resulting in a spacer which is some 15mm shorter. Industrial loctite was used to bond the two parts togther after the orientation was set such that the tandem pump will be reverted back to its original angular position.
The end result once fitted to the car will be the tandem pump in the correct orietation put around 35mm nearer to the passenger side, this is enough to clear the Bosch tandem pump, releaves the strain on the rubber elbow and means that the pipe connection into the ASV works as Audi intended and needs no modification due to a different angle of the ASV.
I'm sure Andrew will add some pictures tomrrow after his friendly mechanic as fitted the Bosch tandem pump and the additional spacer
For now attached are the pictures of the modified spacer/ original spacer / ASV all screwed together
Service is available to anyone who needs it, PM me for further details
The Bosch pump technically only fits the AMF engine, the BHC and ATL were always fitted with the far less reliable LUK tandem pump. However the Bosch pump does fit the BHC / ATL engine, but the ASV (anti shudder value) fitted to the BHC / ATL engine is electrically operted and as such is far bulkier then the vacuum operated ASV on the AMF engine. This causes a clash on of the ASV with the Bosch Tandem pump on the BHC / ATL engines
A solution was found by another member on A2OC which is to utilise TWO of the spacers which Audi fitted between the EGR valve and the ASV, by fitting an extra spacer the ASV is pushed around 60mm towards the passenger side and as such clears the Bosch Tandem pump.
However there is a couple of problems caused by this modification -
1) the ASV is rotated by around 45 degres
2) the movement of the ASV to the passenger side means that the rubber elbow is bent for accutly which is not ideal
The solution I came up with is to cut the second spacer into two halves, so you have effectively two flanges with stubs of tube attached.
Then turn the outside diameter of one of them, down to 47mm Diameter by 12mm long
Then on the other half turn a bore 47.1mm diameter by 12.25mm long
The two parts will then fit together resulting in a spacer which is some 15mm shorter. Industrial loctite was used to bond the two parts togther after the orientation was set such that the tandem pump will be reverted back to its original angular position.
The end result once fitted to the car will be the tandem pump in the correct orietation put around 35mm nearer to the passenger side, this is enough to clear the Bosch tandem pump, releaves the strain on the rubber elbow and means that the pipe connection into the ASV works as Audi intended and needs no modification due to a different angle of the ASV.
I'm sure Andrew will add some pictures tomrrow after his friendly mechanic as fitted the Bosch tandem pump and the additional spacer
For now attached are the pictures of the modified spacer/ original spacer / ASV all screwed together
Service is available to anyone who needs it, PM me for further details