Abstract
Continued development work at University College, Dublin, on the variable compression ratio, two-stroke diesel engine, discussed in earlier communications to the Institution, has demonstrated the ability of this unique design to combine long service life with high specific output. The present paper summarizes the current status of the programme after four years' work.
The basic design philosophy adopts a two-stroke cycle and exhaust gas turbocharging to obtain high specific output, and an automatic variable compression ratio mechanism to ensure long service life by controlling piston loads.
The paper gives details of the variable compression ratio mechanism including the specification of the various components of which it is comprised. Test results show the response rate of the mechanism relative to changes in engine operation. Results are also given for the engine as operated with various air supply blowers to give characteristics suitable for specific user applications.
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