The SAAB variable compression engine is an engine where the engine
cylinder is hinged to the crank case and can be tilted by an hydraulic
adjuster. Different tilt angles results in different clearance volumes
which gives different compression ratios.
The basic idea
Use high compression ratio during low loads for high efficiency, and
when the load increases then the compression ratio is decreased to
match knocking and internal heat transfer. The result is a small super
charged engine with high specific performance leading to good fuel
consumption, but with performance equal to a larger engine.
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