Left side of a Ford Cologne V6 engine, clearly showing a (rusty) cast iron exhaust manifold - three exhaust ports into one pipe.
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Exhaust Manifolds

In automotive engineering, an intake manifold or inlet manifold is a part of an engine that supplies the fuel/air mixture to the cylinders. An exhaust manifold or header collects the exhaust gases from multiple cylinders into one pipe. more...

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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. This manifold vacuum can be used as a source of automobile ancillary power to drive auxiliary systems: (ignition advance, power assisted brakes, cruise control, windscreen 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 located between the carburetor and the cylinder head. On multi point injected engines, the intake manifold holds the fuel injectors.

Exhaust manifolds are generally and traditionally simple cast iron units which collect engine exhaust and deliver it to the exhaust pipe. However, when greater performance is required, this restrictive tube is often replaced with individual headers which are tuned for low restriction and improved performance. Headers have been widely available from aftermarket sources for decades, and some manufacturers have begun using them as original equipment. The Honda J30A2 engine does away with exhaust manifolds altogether, using an integral engine block passage to route gases directly to the catalytic converter.

See also: engine tuning

Read more at Wikipedia.org


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1991-2002 Jeep Wrangler 2.5L Exhaust Manifold 92 93 94 $74.99 1994 94 Toyota Celica 1.8L 7Afe Exhaust Manifold 1.8 $50.25
89-93 Toyota Supra Turbo Manifold 1Jzgte 1Jz Jza70 Mk3 $118.00 1969 Ss350/Dz 302 Z/28 Camaro Exhaust Manifolds Dated 9 $350.00
90 91 92 93 Exhaust Manifold Isuzu Stylus Geo Storm 1.6 $41.85 Exhaust Manifold chevrolet Camaro 67-70 69 68 1967 1970 $33.71
Fiat 2000/124 Spider Exhaust Manifold 1977 $15.00 Exhaust Manifold chevrolet Tahoe 95 1995 part auto Suv $45.35
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91 92 93 Ford Escort Exhaust Manifold 1.9 Sohc New $86.90 89-94 Nissan 240Sx S13 Sr20Det Turbo Manifold Top Mount $63.00
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Prices current as of last update, 11/07/09 8:36pm.

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