Dan Morel about photos of an alleged new CVO Road Glide and CVO Street Glide taken from the factory floor. Watch as Jason Fenske of Engineering Explained walks us through VVL and VVT in much more interesting detail. A couple of days ago, we were tipped off by Harley-Davidson blogger Dr. This allows for more control over how much air-fuel mixture is in the cylinder (less under light-load driving, more when power is needed), controlling temperature and emissions.īut that's only a very basic explanation. Essentially, it allows the engine to advance or retard the valve timing using oil pressure. Variable valve timing, on the other hand, is used mainly for emissions control. (VVT) Variable Valve Timing Basically Comes In Two Types: Single (VVT) Continuously varies the timing, of the intake camshaft. Under regular conditions, the engine will use the low-lift cam to operate the valves, but under higher load, a solenoid switches the engine over to the to the high-lift cam (or cams), increasing valve travel and therefore, performance. Instead of having one cam profile for the entire rev range, a VVL engine has two: low-lift and high-lift. Variable valve lift is mainly used to enhance performance. These systems sound pretty similar, but what do they actually do? Luckily, there's a real engineer here to explain it to us. Engine valve systems have mainly been designed to accurately control the. Variable valve lift (VVL) and variable valve timing (VVT) are two of the most popular ones. Valve lift- how much the valves physically open (their opening aperture). But how Source smlive903 Variable valve timing (vvt) systems The lobes on the camshaft are egg-shaped and make contact with the lifter or rocker arm for a specific amount of time (duration). Valve duration- how long the valves stay open. Variable valve timing is a concept that was put in use decades ago in aircraft engines, with experiments in sliding camshafts and other concepts. Manufacturers like to use a lot of acronyms on their cars. Variable valve timing technology controls three key characteristics of the intake and exhaust valves: Valve timing- the points in the piston’s movement at which the valves open and close.
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