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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.
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 ...
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 ...
The roof panel, which was made from fiberglass or optionally from clear acrylic, was removable. The Corvette C4 came standard with an electronic dashboard with a digital liquid crystal display instrument cluster. It displayed a combination of graphics for speed and RPM, fuel level, and used digital displays for other important engine functions.
Besides the lightweight heads and bigger ports, it came with an even hotter camshaft, stratospheric 12.5:1 compression, an aluminum radiator, small-diameter flywheel, and a single huge Holley four-barrel carburetor. Although the factory advertised L88 rating was 430 bhp at 4,600 rpm, the true rating was said to be about 560 bhp at 6,400 rpm.
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Diego tries to clean off the dirt by revving the engine, but his method causes the right muffler to explode and damage the bodywork. The team races against time to repair the body panel, replace the muffler, and install the restored interior. Once Paul takes the Corvette for a test drive, he values it at £15,400 - a profit of £1,700. [18]