Tim­ing tech New VVT sys­tem ex­plained

Meet the new GSX-R’S clever valve sys­tem

Motorcycle News (UK) - - Garage - Gareth Hall Boss of Red­car Mo­tor­cy­cles in Le­ices­ter, with 50 years ex­pe­ri­ence with Suzukis

The GSX-R1000 has al­ways been known for mid-range grunt, but over the years Suzuki have had to go for big­ger bores and shorter stroke to chase top-end power. The K9 was the last over­haul, but the 2017 model is much more over-square. Suzuki’s Vari­able Valve Tim­ing ( VVT) has en­abled en­gi­neers to keep the mid-range with­out com­pli­cated elec­tron­ics.

Suzuki’s Mo­togp gu­rus de­vel­oped VVT over 10 years to get around the FIM rules that state: ‘vari­able valve tim­ing and vari­able valve lift sys­tems, driven by hy­draulic and/or elec­tric/ elec­tronic sys­tems, are not per­mit­ted.’ So this is the prod­uct of Suzuki’s in­ter­pre­ta­tion of those Mo­togp reg­u­la­tions, and this year the sports­bike-buy­ing pub­lic get to ben­e­fit from it.

As the en­gine spins faster, steel balls move out­wards, forc­ing the phaser apart and chang­ing the tim­ing The cam phaser is split into two halves. Springs (left) push the two sides to­gether. Al­ter­ing the ten­sion of these springs will change the revs at which the tim­ing changes

Full launch re­port on the new GSX-R in next week’s MCN

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