To enhance torque at engine speeds below 1800 rpm, the nozzle vanes would close to narrow the air path and increase the speed of the air flow.
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At higher engine speeds, however, the vanes would open to reduce airflow resistance and improve fuel consumption.
Furthermore, cooling slits between the cylinder bores provided water cooling channels.
The forged connecting rods had fracture split bearings for the crank end and an asymmetrical profile which increased precision during assembly.