2017 Suzuki GSX R1000 Racing Variable Valve Timing System – Video

 

Exploiting the higher engine speed and increasing the high-rpm power without affecting lower and mid-rpm power presented a challenge. The valve timing typically needed for higher peak power also reduces mid-range and lower-rpm power, and vice versa. The answer came from the proprietary, proven Suzuki Racing VVT (SR-VVT) System developed for Moto GP racing. Unlike complicated variable valve timing systems used by other manufactures, the SR-VVT is simpler, more compact, lighter and more positive. The centrifugally operated system is built into the intake cam sprocket and an adjacent guide plate, using 12 steel balls and slanted grooves to rotate the sprocket and retard the intake valve timing at a pre-set rpm, adding significantly to high-rpm power.

 

 

The beauty of the SR- VVT system is in its compact simplicity, light weight, reliability and seamless operation. Centrifugal force is constantly produced any time the engine is running, and is free in the sense that it does not use power that could otherwise reach the rear wheel. From the start of development about a decade ago, Suzuki MotoGP racers have never been able to feel or detect when the system moved to change the valve timing. What they have been able to feel is a seamless, significant increase in high-rpm power, without sacrificing any low-rpm or mid-range performance.

12 steel balls are positioned between slanted grooves in the intake cam sprocket and straight grooves in an adjacent guide plate attached directly to the camshaft. As centrifugal force moves the balls outward at high rpm, the offset grooves align, rotating the position of the cam sprocket on the camshaft and retarding intake cam timing.

Intake cam timing is thus optimized for both high-rpm and low and mid-rpm ranges; extra top-end is added, without losing low-to-mid range power.

The system is built into existing parts, taking up no extra room in the engine, and the weight increase is minimal.