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It's What Makes a Subaru, a Subaru:
Chain-Driven Camshafts

Engines consist of myriad pieces, all of which must function precisely. Some Subaru engines use chain drive to tie together a number of those pieces.

 

During a Subaru engine’s four-stroke cycle, intake and exhaust valves have to open and close at exactly the right times to let an air-fuel mixture into the combustion chambers, hold it in through compression and ignition, open to expel the resulting gases, then start over again. Subaru engines have overhead camshafts that actuate the valves, and those camshafts are driven by chains in most of the company’s new engines.

 

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