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2. Timing belt (camshaft) - Wikipedia

   en.wikipedia.org/wiki/Timing_belt_(camshaft)

   The advantages of timing belts are typically a lower cost, reduced friction losses, [citation needed] less noise and that belts traditionally do not require lubrication. The main disadvantage is that belts wear over time, therefore belt replacement is recommended at specific intervals.

3. Overhead camshaft engine - Wikipedia

   en.wikipedia.org/wiki/Overhead_camshaft_engine

   : 93 A disadvantage of timing belts is the need for regular replacement of the belt;: 94 recommended belt life typically varies between approximately 50,000–100,000 km (31,000–62,000 mi). [11] : 94–95 [12] : 250 If the timing belt is not replaced in time and fails and the engine is an interference engine , major engine damage is possible.

4. Variable valve timing - Wikipedia

   en.wikipedia.org/wiki/Variable_valve_timing

   Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.

5. Variator (variable valve timing) - Wikipedia

   en.wikipedia.org/wiki/Variator_(variable_valve...

   Variable valve timing (VVT) is a system for varying the valve opening of an internal combustion engine. This allows the engine to deliver high power, but also to work tractably and efficiently at low power. [1] There are many systems for VVT, which involve changing either the relative timing, duration or opening of the engine's inlet and ...

6. Camshaft - Wikipedia

   en.wikipedia.org/wiki/Camshaft

   A camshaft is a shaft that contains a row of pointed cams in order to convert rotational motion to reciprocating motion. Camshafts are used in piston engines (to operate the intake and exhaust valves), [1] [2] mechanically controlled ignition systems and early electric motor speed controllers . Camshafts in piston engines are usually made from ...

7. Belt (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Belt_(mechanical)

   Belt (mechanical) A belt is a loop of flexible material used to link two or more rotating shafts mechanically, most often parallel. Belts may be used as a source of motion, to transmit power efficiently or to track relative movement. Belts are looped over pulleys and may have a twist between the pulleys, and the shafts need not be parallel.