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Geoffrey was a keen motorcyclist and rode a Norton Commando at this time. Terry had made the better choice and rode a Velocette Venom...
Back-to-back power tests were completed with Roe’s new silencer. It was found that the ‘annular discharge’ silencer gave a large boost in low speed torque. The net effect was an increase in power from 2000-4000rpm, a slight loss from 4000-5000rpm, and a gain above 5000rpm. The increase in low speed torque allowed the Norton to be fitted with a higher gear ratio, which also meant a reduction in noise due to the lower engine speed utilised during noise certification testing.
Back-to-back power tests were completed with Roe’s new silencer. It was found that the ‘annular discharge’ silencer gave a large boost in low speed torque. The net effect was an increase in power from 2000-4000rpm, a slight loss from 4000-5000rpm, and a gain above 5000rpm. The increase in low speed torque allowed the Norton to be fitted with a higher gear ratio, which also meant a reduction in noise due to the lower engine speed utilised during noise certification testing.
Geoffrey Roe: The Annular Discharge Silencer
The following blog hopefully gives an insight into the research and development work carried out in the early 1970’s into the efficient...
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