timmus
A2OC Donor
My A2 spent the Christmas period with Vince at Stealth for some fairly serious repairs and upgrades.
Some time ago, I posted a query about a metallic knocking noise upon accelerating and engine braking. There seemed to be slack in the powertrain or drivetrain. The knocking was being caused by the slack being taken up in either direction.
The most annoying manifestation of the problem used to happen when driving on cruise control. When driving over the apex of a hill on the motorway, cruise control modulates the accelerator to keep the speed steady as gravity first hinders progress (when going uphill) and then assists progress (when going downhill). There comes a brief point when the engine is neither positively driving the car forwards, but nor is it yet braking the car. At this point, the slack would ‘oscillate’ back and forth, causing a violent, rapid knocking.
With the help of various garages, the slack was eventually traced to the differential. For this to be fixed, the gearbox needs to be removed from the car and opened up. So, I asked Vince to do this for me and, upon rebuilding the ‘box, to add a 6th gear.
The purpose of this thread is simply to show the work that has been done to my car. I realise some members may already know and understand a lot of this, but nevertheless I'll try to give as good an explanation as I can manage with the photos I’ve got. Some of the photos were taken by Vince using his iPhone and others were taken by me using my SLR, hence the varying quality.
Some time ago, I posted a query about a metallic knocking noise upon accelerating and engine braking. There seemed to be slack in the powertrain or drivetrain. The knocking was being caused by the slack being taken up in either direction.
The most annoying manifestation of the problem used to happen when driving on cruise control. When driving over the apex of a hill on the motorway, cruise control modulates the accelerator to keep the speed steady as gravity first hinders progress (when going uphill) and then assists progress (when going downhill). There comes a brief point when the engine is neither positively driving the car forwards, but nor is it yet braking the car. At this point, the slack would ‘oscillate’ back and forth, causing a violent, rapid knocking.
With the help of various garages, the slack was eventually traced to the differential. For this to be fixed, the gearbox needs to be removed from the car and opened up. So, I asked Vince to do this for me and, upon rebuilding the ‘box, to add a 6th gear.
The purpose of this thread is simply to show the work that has been done to my car. I realise some members may already know and understand a lot of this, but nevertheless I'll try to give as good an explanation as I can manage with the photos I’ve got. Some of the photos were taken by Vince using his iPhone and others were taken by me using my SLR, hence the varying quality.
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