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- Q8565052 subject Q7334987.
- Q8565052 subject Q8430498.
- Q8565052 abstract "A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit engine speed. At low engine speeds the wave pressure within the pipe network is low. A full oscillation of the Helmholtz resonance occurs before the exhaust valve is closed, and to increase low-speed torque, large-amplitude exhaust pressure waves are artificially induced. This is achieved by partial closing of an internal butterfly valve within the exhaust at the point where the primary pipes from the cylinders join. This junction point essentially behaves as an artificial atmosphere. The alteration of the pressure at this point controls the behavior of reflected waves at this sudden increase in area discontinuity. Closing the valve increases the local pressure, inducing the formation of larger-amplitude negative reflected expansion waves. A servo motor controlled by the ECU opens and shuts the valve. The valve goes from being almost fully closed at idle speed, through to fully open at higher engine speeds. This ensures superior low to mid-range performance, more linear power output and reduced exhaust noise levels while the valve is in its reduced opening position.Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). It first appeared on the Yamaha FZR EXUP and was later used on many other Yamahas. Later versions from Honda went by the names Honda Titanium Exhaust Valve (HTEV) and Honda Variable Intake/Exhaust (H-VIX), appearing on the CBR600RR and Honda CBR929RR. Suzuki's version is called Suzuki Exhaust Tuning (SET). The system is also used on the Triumph Daytona 675 triple.".
- Q8565052 thumbnail 2007_Honda_CBR600RR_exhaust_power_valve_4.jpg?width=300.
- Q8565052 wikiPageWikiLink Q1196635.
- Q8565052 wikiPageWikiLink Q1569889.
- Q8565052 wikiPageWikiLink Q158888.
- Q8565052 wikiPageWikiLink Q1626501.
- Q8565052 wikiPageWikiLink Q1719619.
- Q8565052 wikiPageWikiLink Q181642.
- Q8565052 wikiPageWikiLink Q191801.
- Q8565052 wikiPageWikiLink Q2978700.
- Q8565052 wikiPageWikiLink Q2982767.
- Q8565052 wikiPageWikiLink Q332934.
- Q8565052 wikiPageWikiLink Q6345366.
- Q8565052 wikiPageWikiLink Q640815.
- Q8565052 wikiPageWikiLink Q663336.
- Q8565052 wikiPageWikiLink Q7334987.
- Q8565052 wikiPageWikiLink Q763711.
- Q8565052 wikiPageWikiLink Q8430498.
- Q8565052 wikiPageWikiLink Q9584.
- Q8565052 comment "A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit engine speed. At low engine speeds the wave pressure within the pipe network is low. A full oscillation of the Helmholtz resonance occurs before the exhaust valve is closed, and to increase low-speed torque, large-amplitude exhaust pressure waves are artificially induced.".
- Q8565052 label "Four-stroke power valve system".
- Q8565052 depiction 2007_Honda_CBR600RR_exhaust_power_valve_4.jpg.