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  2. Toyota R engine - Wikipedia

    en.wikipedia.org/wiki/Toyota_R_engine

    The 20R head has straight ports, so can flow better than the 22R head, improving high RPM power. The 20R head is a simple bolt-on modification for the pre-1985 block, but also requires the use of the 20R intake manifold, making it almost impossible (there's a lot of matching necessary) to use with the 22R-E EFI system. [ 21 ]

  3. Cylinder head - Wikipedia

    en.wikipedia.org/wiki/Cylinder_head

    In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern overhead valve and overhead camshaft engines, the head is a more complicated metal block that also contains the inlet and exhaust passages, and often coolant passages, Valvetrain components, and fuel injectors.

  4. Opel cam-in-head engine - Wikipedia

    en.wikipedia.org/wiki/Opel_Cam-in-head_engine

    The original design of the cam-in-head engine was done by General Motors in Detroit, Michigan. [1] Although the camshaft is in the cylinder head, the CIH is not a true overhead camshaft design. Rather it can be thought of as a cam-in-block engine with a greatly shortened valve drivetrain. The camshaft is driven by a roller chain.

  5. Toyota RZ engine - Wikipedia

    en.wikipedia.org/wiki/Toyota_RZ_engine

    The cylinder head is composed of aluminum alloy and the intake manifold is made from aluminum. [5] 3RZ-FE in a Toyota Tacoma. Applications: [5] 1995–2004 Toyota Tacoma; 1996–2000 Toyota 4Runner; 1994–1998 Toyota T100; 1995–2002 Granvia; 1995–2004 Toyota Hilux; 1990–2004 Toyota HiAce; 2001–2009 Toyota Land Cruiser Prado [citation ...

  6. Timing belt (camshaft) - Wikipedia

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

    In most piston engines, the camshaft(s) are mechanically connected to the crankshaft. The crankshaft drives the camshaft (via a timing belt, timing chain or gears), which in turn actuates the intake and exhaust valves. [1] These valves allow the engine to inhale air (or an air/fuel mixture) and exhale the exhaust gasses. [2]

  7. Hemispherical combustion chamber - Wikipedia

    en.wikipedia.org/wiki/Hemispherical_combustion...

    A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...