4-stroke power valve system

From Wikipedia, the free encyclopedia

A 4-stroke powervalve is a device fitted to 4 stroke engines that constantly adjusts the internal diameter of the exhaust system to perfectly suit engine revolutions.

This ensures superior low to mid-range performance (ca. 12-20% improvement), linear power output and reduced exhaust noise levels while the valve is in its reduced opening position.

  • Yamaha EXUP (Exhaust Ultimate Power valve)
  • Honda HTEV (Honda Titanium Exhaust Valve)
  • Suzuki SET (Suzuki Exhaust Tuning)
 This article about an automotive technology is a stub. You can help Wikipedia by expanding it.