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- Helical_camshaft abstract "A helical camshaft is a type of mechanical variable valve actuation (VVA) system. More specifically it is a camshaft that allows the valve opening duration to be varied over a wide, continuous, step-less, range, with all of the added duration being at full valve lift.In this article a “variable duration camshaft” refers to a camshaft with a design that is intended to replace a conventional camshaft in a cylinder head and operate the valves through conventional followers. Further qualifications are:that the duration range is step-less and continuousall the added range is at full valve liftthe range is wide enough to allow full torque/power at even extremely high RPMthe range is wide enough to allow engine load control by late inlet valve closing (LIVC)the rates of valve opening/closing, acceleration, jerk etc. are within acceptable limits at all duration settingsThese qualifications must be made as there have been many claims over the years of purely mechanical variable duration camshafts but none have been able to meet all these requirements.[citation needed]Despite enormous effort and expense being expended by both large organisations and private individuals, camshaft arrangements like U.S. Patent 1,527,456 have never been significantly improved upon and have remained unused by the mainstream automotive community. The opinion of many engineers (and others) on the possibility of a workable variable duration camshaft being developed after so much effort and so many years of unsuccessful attempts was that it was highly unlikely that it ever could be done and would remain an unobtainable “holy grail.”".
- Helical_camshaft thumbnail Wiki_cam_photo_1.jpg?width=300.
- Helical_camshaft wikiPageExternalLink twowheels.com.au.
- Helical_camshaft wikiPageExternalLink www.fastfours.com.au.
- Helical_camshaft wikiPageID "19520357".
- Helical_camshaft wikiPageRevisionID "604618290".
- Helical_camshaft hasPhotoCollection Helical_camshaft.
- Helical_camshaft subject Category:Engine_technology.
- Helical_camshaft subject Category:Variable_valve_timing.
- Helical_camshaft comment "A helical camshaft is a type of mechanical variable valve actuation (VVA) system. More specifically it is a camshaft that allows the valve opening duration to be varied over a wide, continuous, step-less, range, with all of the added duration being at full valve lift.In this article a “variable duration camshaft” refers to a camshaft with a design that is intended to replace a conventional camshaft in a cylinder head and operate the valves through conventional followers.".
- Helical_camshaft label "Helical camshaft".
- Helical_camshaft sameAs m.04mx8s2.
- Helical_camshaft sameAs Q17022183.
- Helical_camshaft sameAs Q17022183.
- Helical_camshaft wasDerivedFrom Helical_camshaft?oldid=604618290.
- Helical_camshaft depiction Wiki_cam_photo_1.jpg.
- Helical_camshaft isPrimaryTopicOf Helical_camshaft.