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  2. Howard Johansen - Wikipedia

    en.wikipedia.org/wiki/Howard_Johansen

    Howard and his wife retired in 1965 and turned the business over to his oldest son, Jerry, who ran the company until 1985. Jerry was considered one of the top engine turners of his day, and along with Don Madden, ran a series of “Howards Cams Rattler” and “Howards Cams Special” top fuel cars out of the shop as test beds for new products.

  3. Desmodromic valve - Wikipedia

    en.wikipedia.org/wiki/Desmodromic_valve

    A desmodromic valve is a reciprocating engine poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring. The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust spent gases at the end of the cycle.

  4. B. S. Cunningham Company - Wikipedia

    en.wikipedia.org/wiki/B._S._Cunningham_Company

    [30] [31] In its ultimate form the A311 engine used a gear-driven, high-lift long-duration camshaft, special pistons, roller tappets, dual valve springs, special pushrods, Hilborn fuel injection with tuned intake stacks, and a compression ratio of 12:1. Output was estimated to have been 300 hp (223.7 kW), high enough to flex the block and ...

  5. Valvetrain - Wikipedia

    en.wikipedia.org/wiki/Valvetrain

    Cutaway of a dual overhead camshaft engine 1969 AMC V8 overhead valve engine. The rocker cover has been removed, so the pushrods, rocker arms, valve springs, and valves are visible. A valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. [1]

  6. Valve float - Wikipedia

    en.wikipedia.org/wiki/Valve_float

    Stiffer valve springs can help prevent valve float and valve bounce but at the expense of increased friction losses, higher stresses, and more rapid wear in the valvetrain. Various techniques have been used to offset the effect of stiffer springs, such as dual-spring and progressive-sprung valves, roller-tipped tappets, and pneumatic valve ...

  7. Rocker arm - Wikipedia

    en.wikipedia.org/wiki/Rocker_arm

    A similar arrangement transfers the motion via another roller tip to a second rocker arm. This rotates about the rocker shaft, and transfers the motion via a tappet to the valve. [clarify] Some OHC engines employ short rocker arms, also known as fingers, in which the cam lobe pushes down (rather than up) on the rocker arm to open the valve.

  8. Cam (mechanism) - Wikipedia

    en.wikipedia.org/wiki/Cam_(mechanism)

    The cam can be seen as a device that converts rotational motion to reciprocating (or sometimes oscillating) motion. [clarification needed] [3] A common example is the camshaft of an automobile, which takes the rotary motion of the engine and converts it into the reciprocating motion necessary to operate the intake and exhaust valves of the cylinders.

  9. Tappet - Wikipedia

    en.wikipedia.org/wiki/Tappet

    In an overhead valve engine the tappets (on right) are sandwiched between pushrods and the camshaft. In an internal combustion engine, a tappet (also called a 'valve lifter' or 'cam follower') [3] [4] [5] is the component which converts the rotation of the camshaft into vertical motion to open and close an intake or exhaust valve.