Turbocharger: Description and Operation

The turbocharged engine is similar to the standard 4-135 engine. However, many components have been upgraded in order to withstand more than fifty percent higher power output generated by the turbocharger. This upgrading includes more durable intake and exhaust valve materials, better sealing piston rings, a larger capacity oil pump, select-fit bearings, and a revised camshaft. Dished piston tops are incorporated to lower the compression ratio.

Fig. 42 Section view of Garret-AiResearch T3 type turbocharger:

Fig. 43 Turbocharger water cooling system:

The turbocharged engine integrates a Garrett-Air-Research T-3 center housing and wastegate assembly with a Chrysler built compressor and turbine housing, and exhaust outlet elbow, Fig. 42. The wastegate is calibrated to regulate maximum boost pressure at 7.5 psi. Turbo boost begins at 1200 RPM, rises to 7.2 psi at 2050 RPM, and peaks at 7.5 psi at 6000 RPM.
This turbocharger also incorporates a water cooled turbine end shaft bearing which lowers bearing temperatures, especially after a hot shut-off, to increase durability of the turbocharger, Fig. 43.