Abstract: The present system provides a power plant comprising plurality of distinct small displacement engines that are removably coupled to a crankshaft using a clutch system. This allows the power plant to operate both as a small displacement engine, with its inherent fuel efficiency advantages, as well as a large displacement engine, with its advantages in power and torque. The system uses a management system to determine when to activate or deactivate engine modules for maximum efficiency. Because the system does not rely on prior art valve deactivation, the system does not suffer from the frictional losses of the prior art, and greater fuel efficiency is achieved.

Abstract: The present system provides a power plant comprising plurality of distinct small displacement engines that are removably coupled to a crankshaft using a clutch system. This allows the power plant to operate both as a small displacement engine, with its inherent fuel efficiency advantages, as well as a large displacement engine, with its advantages in power and torque. The system uses a management system to determine when to activate or deactivate engine modules for maximum efficiency. Because the system does not rely on prior art valve deactivation, the system does not suffer from the frictional losses of the prior art, and greater fuel efficiency is achieved.