The Job:- to drive the supercharger faster. To provide more boost pressure to the engine requires a larger diameter pulley than the standard Porsche 944 3 litre four cylinder engine damper.
The solution John found: He machined a new steel belt drive pulley ring for the supercharger which runs over the existing damper on the same belt drive line as the original but on a larger diameter belt drive line.
The damper itself was bonded, re-rubbered and strengthened with a custom made hub turned up from a special grade of aircraft aluminium which was positioned in the centre of the damper hub to provide additional support to the hub because the original is only a thin steel pressing.
As the original inertia ring could not be altered because of its design the new pulley was attached to the hub of the damper via the new aluminium hub. The whole was bolted together, balanced and polished
Today Graeme, the owner of the Porsche 944 called to say that the modification is successful and that he has raced his machine successfully in two races.
The solution John found: He machined a new steel belt drive pulley ring for the supercharger which runs over the existing damper on the same belt drive line as the original but on a larger diameter belt drive line.
The damper itself was bonded, re-rubbered and strengthened with a custom made hub turned up from a special grade of aircraft aluminium which was positioned in the centre of the damper hub to provide additional support to the hub because the original is only a thin steel pressing.
As the original inertia ring could not be altered because of its design the new pulley was attached to the hub of the damper via the new aluminium hub. The whole was bolted together, balanced and polished
Today Graeme, the owner of the Porsche 944 called to say that the modification is successful and that he has raced his machine successfully in two races.
This modification is not cheap but it is an effective solution for a racing car with limited space for modifications. If you seek an innovative solution to a supercharger issue like this give Damperdude a call or drop us an email damperdude . at . gmail. com.
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