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Note the height and straightness of the ports, particularly the exhaust port on the left. This design is based on a cylinder head casting purpose-built for racing modifications. The head is supplied with small ports with ample material everywhere for porting specialists to shape to their requirements without having to weld on additional metal.
The mechanism by which exhaust emissions are controlled depends on the method of injection and the point at which air enters the exhaust system, and has varied during the course of the development of the technology. The first systems injected air very close to the engine, either in the cylinder head's exhaust ports or in the exhaust manifold.
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 ...
The key difference compared to crossflow scavenging is that the transfer ports are located either side of the exhaust port and aimed at the opposite cylinder wall. [3] As the fuel/air mixture enters the combustion chamber, it travels across the cylinder then up the cylinder wall opposite the exhaust port before looping over at the cylinder head ...
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The airport diagrams are part of the Aeronautical Information Publication (AIP) which is updated on a 28-day cycle as per the ICAO.For the FAA's digital - Terminal Procedures Publication/Airport Diagrams, this causes a change in the URL involving four numbers: the first two represent the year (09 for 2009, 10 for 2010) and the second two represent the current AIRAC cycle (01 through 13).
TPI Specialties was founded by Myron Cottrell, a professional engine builder, who had bought a new Chevrolet Corvette in 1985 and was intrigued by the potential for improvement in its Tuned Port Injection fuel injection system.
In diesel engines in particular, EGR systems come with serious drawbacks, one of which is a reduction in engine longevity. For example, because the EGR system routes exhaust gas directly back into the cylinder intake without any form of filtration, this exhaust gas contains carbon particulates. And, because these tiny particles are abrasive ...