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- an abbreviation for Volumetric Efficiency usually used in internal combustion engines.
- usual VE of stock naturally aspired engines is 80% at max. torque and 75% at max. power
- stock TDi engines ca. 90% at max. torque and 80% at max. speed
- heavily optimized racing engines achieve VE =>100%
- VAG claims 2-valve per cylinder TDi with VE up to 95% and 4-valve design up to 98%.