Turbocharger - Gasoline: Description
The Volvo Turbo uses a B21F engine equipped with an exhaust driven turbo-compressor. The turbocharger is mounted on the passenger side of the engine. Components include the turbine, compressor wheel, rotor shaft, bearings, housing, and wastegate. In addition, a pressure regulator, pressure switch, overload protection switch, and a turbo warning light on the instrument panel are connected into the system.
Engine modifications made to the B21F engine to accept the turbocharger are as follows: Pistons have increased clearance in the bore to withstand the high temperatures generated by the turbocharger. Compression ratio has been lowered to offset some of the increased charge provided by the compressor.
Exhaust valves are stellite-coated and sodium-cooled to resist high temperatures. An engine oil cooler located at the side of the radiator has an integral thermostat. The air/fuel control unit on engines equipped with the Continuous Injection System is the same as the 6-cylinder engine model, with 2 of the fuel outlets plugged.