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Cylinder and ports, viewed from above. Schnuerle porting [1] [2] is a system to improve efficiency of a valveless two-stroke engine by giving better scavenging.The intake and exhaust ports cut in the cylinder wall are shaped to give a more efficient transfer of intake and exhaust gases.
A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
With trucks, sometimes the silencer is crossways under the front of the cab, and its tailpipe blows sideways to the offside (right side if driving on the left, left side if driving on the right). The side of a passenger car on which the exhaust exits beneath the rear bumper usually indicates the market for which the vehicle was designed, i.e ...
For two-stroke engines, crossflow scavenging was used in early crankcase-compression engines, such as used by small motorcycles. The transfer port (where the fuel/air mixture enters the combustion chamber) and the exhaust port were located on opposite sides of the combustion chamber. This arrangement had the advantage of simplicity, but it also ...
When the transfer is complete, the piston is on the compression stroke but the exhaust port is still open, an unavoidable problem with the two stroke piston port design. To help prevent the piston pushing fresh mixture out the open exhaust port the strong acoustic wave (produced by the combustion) from the expansion chamber is timed to arrive ...
To satisfy the demand for larger carburettors the 1000 series was introduced in 1970 with bore sizes of 34, 36 and 38mm. [ 23 ] The British motorcycle industry was in decline and with the lack of orders for OEM carburettors, production was limited after 1975 for replacement and aftermarket sales.
Gemtech (stylized as GEMTECH) is an American manufacturer of silencers (suppressors) for pistols, rifles, submachine guns, and personal defense weapons (PDWs). The company also produces ammunition and various accessories. [2] [3] [4] Gemtech was founded in 1993 and is headquartered in Eagle, Idaho.
This was achieved by increasing the stroke by 2 mm (0.079 in) to 86 mm (3.39 in), [3] by using a new forged steel crankshaft. [8] Other changes included revised camshafts, compression ratio increasing to 10:1, a variable-length inlet manifold (to improve low-rev torque), [ 3 ] equal length stainless steel exhaust headers [ 9 ] a hotwire mass ...