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Exhaust Question !!!
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<blockquote data-quote="sakuraguy" data-source="post: 1699337" data-attributes="member: 6441"><p><strong>Manifolds .. Simplified</strong></p><p></p><p>The word "manifold" literally means "hand shaped", which arises from the "fingers" leading to or away from each cylinder.</p><p></p><p>Due to the suction effect of the downward movement of the pistons in a reciprocating piston engine, a partial vacuum (lower than atmospheric pressure) exists in the intake manifold. If the engine has a throttle valve (i.e. in spark ignition rather than diesel engines) this manifold vacuum can be substantial, and can be used as a source of automobile ancillary power to drive auxiliary systems: (ignition advance, power assisted brakes, cruise control, windshield wipers, power windows, ventilation system valves, etc). This vacuum can also be used to 'suck' any piston blow-by gases from the engine's crankcase. This is known as a closed crankcase ventilation or positive crankcase ventilation (PCV) system. This way the gases are burned with the fuel/air mixture.</p><p></p><p>The intake manifold is usually made of aluminium and located between the carburetor and the cylinder head. On multi point injected engines, the intake manifold holds the fuel injectors.</p></blockquote><p></p>
[QUOTE="sakuraguy, post: 1699337, member: 6441"] [B]Manifolds .. Simplified[/B] The word "manifold" literally means "hand shaped", which arises from the "fingers" leading to or away from each cylinder. Due to the suction effect of the downward movement of the pistons in a reciprocating piston engine, a partial vacuum (lower than atmospheric pressure) exists in the intake manifold. If the engine has a throttle valve (i.e. in spark ignition rather than diesel engines) this manifold vacuum can be substantial, and can be used as a source of automobile ancillary power to drive auxiliary systems: (ignition advance, power assisted brakes, cruise control, windshield wipers, power windows, ventilation system valves, etc). This vacuum can also be used to 'suck' any piston blow-by gases from the engine's crankcase. This is known as a closed crankcase ventilation or positive crankcase ventilation (PCV) system. This way the gases are burned with the fuel/air mixture. The intake manifold is usually made of aluminium and located between the carburetor and the cylinder head. On multi point injected engines, the intake manifold holds the fuel injectors. [/QUOTE]
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