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- Four-stroke_power_valve_system 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.".
- Four-stroke_power_valve_system thumbnail 2007_Honda_CBR600RR_exhaust_power_valve_4.jpg?width=300.
- Four-stroke_power_valve_system wikiPageID "6344502".
- Four-stroke_power_valve_system wikiPageLength "2896".
- Four-stroke_power_valve_system wikiPageOutDegree "18".
- Four-stroke_power_valve_system wikiPageRevisionID "692655770".
- Four-stroke_power_valve_system wikiPageWikiLink Butterfly_valve.
- Four-stroke_power_valve_system wikiPageWikiLink Category:Exhaust_systems.
- Four-stroke_power_valve_system wikiPageWikiLink Category:Motorcycle_engines.
- Four-stroke_power_valve_system wikiPageWikiLink Engine_control_unit.
- Four-stroke_power_valve_system wikiPageWikiLink Exhaust_manifold.
- Four-stroke_power_valve_system wikiPageWikiLink Four-stroke_engine.
- Four-stroke_power_valve_system wikiPageWikiLink Helmholtz_resonance.
- Four-stroke_power_valve_system wikiPageWikiLink Honda.
- Four-stroke_power_valve_system wikiPageWikiLink Honda_CBR600RR.
- Four-stroke_power_valve_system wikiPageWikiLink Honda_CBR900RR.
- Four-stroke_power_valve_system wikiPageWikiLink Kadenacy_effect.
- Four-stroke_power_valve_system wikiPageWikiLink Servomechanism.
- Four-stroke_power_valve_system wikiPageWikiLink Straight-three_engine.
- Four-stroke_power_valve_system wikiPageWikiLink Suzuki.
- Four-stroke_power_valve_system wikiPageWikiLink Triumph_Daytona_675.
- Four-stroke_power_valve_system wikiPageWikiLink Yamaha_FZR1000.
- Four-stroke_power_valve_system wikiPageWikiLink Yamaha_Motor_Company.
- Four-stroke_power_valve_system wikiPageWikiLinkText "EXUP".
- Four-stroke_power_valve_system wikiPageWikiLinkText "Four-stroke power valve system".
- Four-stroke_power_valve_system wikiPageWikiLinkText "butterfly valve".
- Four-stroke_power_valve_system wikiPageWikiLinkText "four-stroke power valve system".
- Four-stroke_power_valve_system align "right".
- Four-stroke_power_valve_system caption "The exhaust power valve of a 2007 Honda CBR600RR.".
- Four-stroke_power_valve_system caption "The servo motor controls the valve via two cables. Shown removed.".
- Four-stroke_power_valve_system direction "vertical".
- Four-stroke_power_valve_system footerAlign "left".
- Four-stroke_power_valve_system headerAlign "center".
- Four-stroke_power_valve_system image "2007".
- Four-stroke_power_valve_system width "260".
- Four-stroke_power_valve_system wikiPageUsesTemplate Template:Multiple_image.
- Four-stroke_power_valve_system wikiPageUsesTemplate Template:Reflist.
- Four-stroke_power_valve_system subject Category:Exhaust_systems.
- Four-stroke_power_valve_system subject Category:Motorcycle_engines.
- Four-stroke_power_valve_system hypernym Device.
- Four-stroke_power_valve_system type Device.
- Four-stroke_power_valve_system type Component.
- Four-stroke_power_valve_system type Redirect.
- Four-stroke_power_valve_system type Technology.
- Four-stroke_power_valve_system type Vehicle.
- Four-stroke_power_valve_system 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.".
- Four-stroke_power_valve_system label "Four-stroke power valve system".
- Four-stroke_power_valve_system sameAs Q8565052.
- Four-stroke_power_valve_system sameAs EXUP.
- Four-stroke_power_valve_system sameAs EXUP.
- Four-stroke_power_valve_system sameAs m.0g20mn.
- Four-stroke_power_valve_system sameAs Q8565052.
- Four-stroke_power_valve_system wasDerivedFrom Four-stroke_power_valve_system?oldid=692655770.
- Four-stroke_power_valve_system depiction 2007_Honda_CBR600RR_exhaust_power_valve_4.jpg.
- Four-stroke_power_valve_system isPrimaryTopicOf Four-stroke_power_valve_system.