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An intake manifold is a system of passages which conduct the fuel
mixture from the carburetor to the intake valves of the engine.
Manifold design has much to do with the efficient operation of an
engine. For smooth and even operation, the fuel charge taken into
each cylinder should be of the same strength and quality.
Distribution of the fuel should, therefore, be as even as possible.
This depends greatly upon the design of the intake manifold. Dry fuel
vapor is an ideal form of fuel charge, but present-day fuel prevents
this unless the mixture is subjected to high temperature. If the fuel
charge is heated too highly, the power of the engine is reduced
because the heat expands the fuel charge. Therefore, it is better to
have some of the fuel deposited on the walls of the cylinders and
manifold vents. Manifolds in modern engines are designed so that the
amount of fuel condensing on the intake manifold walls is reduced to
a minimum.
In a V-8 engine, the intake manifold is mounted between the cylinder
heads. The L-head engine's manifold is bolted to the side of the
block, and the I-head manifold is bolted to the cylinder head.
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