3 THINGS YOU NEED TO KNOW
1 Get into the groove Suzuki’s centrifugally-operated system is built into the intake cam sprocket and an adjacent guide plate, using steel balls and slanted grooves to rotate the sprocket and retard the intake valve timing at a pre-set rpm, which adds to the high– rpm power.
The radial grooves get shallower towards the outer edge, so as the balls move outward they also need to force the two halves apart – which allows the camshaft to rotate a few degrees in relation to its drive sprocket, either advancing or retarding the valve timing in the process.
2 High-tech simplicity The beauty of the system is its compact simplicity and seamless operation. All through its development Suzuki Motogp racers have never been able to feel or detect when the system moved to change the valve timing, unlike older systems fitted to other firms’ road bikes. The only thing Suzuki riders will feel is a seamless and significant increase in high-rev power.
3 Spring tuning
At low revs the spring overcomes the centrifugal force acting on the steel balls, pushing them back towards the centre of the phaser so the timing is shifted to its ‘advanced’ position, boosting low-end torque and improving throttle response. As engine speeds increase, the centrifugal force pushes the balls outwards, retarding the timing and boosting peak bhp. The Motogp guys can change the tension of the spring fitted to the GSX-RR’S engine which will alter the revs at which the timing changes.