VARI­ABLE VALVE TIM­ING ( SR-VVT)

Motorcycle News (UK) - - This Week -

SR-VVT is a me­chan­i­cal so­lu­tion to the prob­lem of al­ter­ing the cam’s po­si­tion, and with it the en­gine’s valve tim­ing. On the new GSX-R1000 it is only on the in­take cam, not the ex­haust, and is ef­fec­tively just a dif­fer­ent de­sign of cam sprocket. The SR-VVT re­places the tra­di­tional cam sprocket with a guide plate and slot­ted cam sprocket that has 12 steel balls po­si­tioned in slanted grooves within it struc­ture. This sys­tem is pushed to­gether us­ing a spring and pres­sure plate. When the centrifugal forces of the cam turn­ing at high rpm be­come strong enough to over­come the spring’s pres­sure, the balls are forced out­wards along the grooves, me­chan­i­cally turn­ing the cam sprocket and al­ter­ing the en­gine’s in­take valve tim­ing. When the pres­sure drops, the spring’s pres­sure forces the balls back down the grooves, re­turn­ing the valve

Tim­ing to its orig­i­nal set­ting. GSX-R sys­tem: sim­ple, ef­fec­tive

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