Adjusting valve timing to deactivate engine cylinders for...

Details Adjusting valve timing to deactivate engine cylinders for... Adjusting valve timing to deactivate engine cylinders for...

2009-08-13

2011-10-25

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S347000, C464S160000

Reexamination Certificate

active

08042504

ABSTRACT:
An internal combustion engine having two cylinder banks and adjustable camshaft timing is disclosed in which the camshafts in one cylinder bank are adjusted so that there is no net flow from the cylinders to effectively disable the cylinder bank. In particular, exhaust valve timing is advanced so that the maximum valve lift occurs approximately at bottom center between expansion and exhaust strokes and intake valve timing is advanced so that maximum valve lift occurs approximately at bottom center between intake and compression strokes. Also disclosed is an engine in which an intake and an exhaust camshaft on a single bank are coaxial with valve timings adjusted by rotating the inner of the two camshafts with respect to the outer of the two camshafts.

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Printout from www.nytimes.com/2007/01/14/automobiles/14VIPER.

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