At a given engine speed, a longer stroke increases engine friction ( since the piston travels a greater distance per stroke ) and increases stress on the crankshaft due to the higher peak piston acceleration.
12.
As the piston travels upward in the cylinder, it creates low pressure area in the crankcase; this draws fresh air and atomized fuel from the carburetor through a hole in the cylinder wall or directly into the crankcase.
13.
A piston rod is attached to the piston and links it to the crosshead, which is a large casting sliding in crosshead guides ( UK : " slidebar " ), allowing it only to move in the same direction as the piston travel.
14.
In the Miller-cycle engine, the piston begins to compress the fuel-air mixture only after the intake valve closes; and the intake valve closes after the piston has traveled a certain distance above its bottom-most position : around 20 to 30 % of the total piston travel of this upward stroke.
15.
Within this movement of the piston up the bore, controlled combustion of the mixture takes place and the maximum pressure occurs just after top dead centre, with the pressure diminishing as the piston travels down the bore . i . e . the cylinder volume in relation to the cylinder pressure-time generation remains essentially constant over the combustion cycle.
16.
Until now, getting more power from a stock engine often meant a time-consuming, costly mechanical overhaul : dismantling the engine, boring the cylinders for bigger pistons, replacing the piston heads, grinding the intake and exhaust ports, " stroking " the engine for longer piston travel, replacing cams, and slapping on a carburetor that delivered more air and more fuel.
17.
Deficiencies in the alignment of the Gresley-Holcroft derived motion meant that the inside cylinder of the A4 did more work at high speed than the two outside cylinders-indeed on at least one occasion this led to the middle big end wearing to such an extent that the increased piston travel knocked the ends off the middle cylinder-and this overloading was mostly responsible for the failure.
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