The air capacity chamber is made from aluminium. It receives pressurised air cooled by the intercooler (on the 115 cv version only) and carries it directly to the cylinder head.There is a throttle casing at the air chamber inlet, operated by the injection control unit.In order to limit the shuddering of the engine whilst is is switching off, the injection control unit closes the throttle whilst in all other operating conditions the throttle remains open.The spiral intake ducts of the intake chamber impose the swirling motion on the air required for efficient combustion.The excess pressure sensor is fitted on the chamber. See descriptions 1060G DIESEL INJECTION PRESSURE PUMP ELECTRONIC CONTROLconnected to the injection control unit.