VVT: a load of ball­bear­ings?

Motorcycle News (UK) - - This Week -

De­vel­oped on Suzuki’s Mo­togp bike since 2008, the new me­chan­i­cal Vari­able Valve Tim­ing ( VVT) system is a sim­ple way of let­ting you have your power cake and eat it.

The system works by cen­trifu­gally ac­ti­vat­ing ball­bear­ings to fling out on the end of the in­let cam to change its ori­en­ta­tion and in­take tim­ing. Suzuki reckon all this adds up to a mo­tor that gives you chunky power in the lower reaches of the rev-range and a handy 5% boost in power around 10,000rpm.

Sit­ting read­ing this you might won­der if there’s a step in power, but the re­al­ity is that when you’re at 10,000rpm on a 200bhp su­per­bike the ac­cel­er­a­tion, speed and wind­blast are so sav­age it’s im­pos­si­ble to de­tect any not­i­ca­ble power surge or hes­i­ta­tion with your eyes so far out on stalks!

Such is the speed of the new Suzuki you’re un­likely to reach 10,000rpm on the road, but on track the VVT mo­tor of­fers one de­li­cious un­in­ter­rupted flow of power from the first crack of throt­tle to the next fren­zied gearchange.

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