Honda CB350 CL350 [28/219] Cam case and cylinder head

Содержание

Похожие устройства

3 2 CAM CASE AND CYLINDER HEAD 3 2 CAM CASE AND CYLINDER HEAD A Construction The cylinder head is made independent of the camshaft and rocker arm support pin housing for greater strength and effective cooling It is constructed of aluminum alloy and incorporates a semi spherical combustion chamber Fig 3 11 Valves are actuated by rocker arm and cam shaft driven through a cam chain SQUISH AREA Fig 3 12 Squish area This is the area in which part of the fuel mixture between the piston and cylinder head is compressed further at the end of the compression stroke to be injected into the main mixture creating a swirl The injected mixture is directed at the spark plug to increase the propagation of combustion Even a lean or a slow burning fuel mixture will produce a smooth combustion with a reduced tendency toward engine knock Refer to Fig 3 1 2 The use of the OHC overhead camshaft has reduced the reciprocating mass of the valve mechanism further the employment of the dual pitch valve spring makes it possible to obtain high speed and high output from the engine Also the combustion efficiency has been greatly improved since the valves may be ideally positioned and the spark plug located in the center of the combustion chamber for greater efficiency Refer to Fig 3 13 The flow of cooling air around the upper portion of the combustion chamber is effective and together with the good heat conductivity of the aluminum alloy head the cooling efficiency has been increased notably The cylinder head cover also incorporates a breather Inside the crankcase the pressure con stantly fluctuates due to the reciprocating motion of the piston and the oil is quickly contaminated and deteriorates due to the gas generated by the high temperature Blow by from the combustion chamber causes a pressure build up within the crankcase In order to prevent this undesirable condition the breather separates the oil within the labyrinth and exhausts the gas to the outside Simultaneously the breather also functions as an oil cooler It also prevents the humidity in the atmosphere from entering the engine Refer to Fig 3 14 D Cam chain 2 Cam sprocket D Cam shaft Valve rocker arm S Rocker arm pm Valve spring 7 Valve Fig 3 13 Valve mechanism 77

Скачать