Different Materials Used to Make Exhaust Manifolds

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Different Materials Used to Make Exhaust Manifolds
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A vehicle's exhaust manifold connects to each
exhaust port on the engine's cylinder head, and
it funnels the hot exhaust down into one simple
exhaust pipe.
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The exhaust manifold gaskets prevent the toxic
exhaust fumes from sneaking into the vehicle and
harming the other components.
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Usually vehicles have just one exhaust manifold
and the turbocharged models have down-pipes on
the hot side of the turbo.
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When it comes to the construction of exhaust
manifolds, they are either going to be
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Cast iron
Welded tubular steel
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Cast iron exhaust manifold
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Most vehicles have cast iron exhaust manifolds as
they are more durable and also cheap to
manufacture.
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In modern cars, exhaust manifolds are designed to
fit into small spaces and this results in lower
horsepower.
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The cast iron exhaust manifolds are often
replaced with more free-flowing tubular designed
headers for an increased horsepower and torque.
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Cast iron manifolds are heavy as well as becomes
brittle with heat cycles and when they crack, the
vehicle becomes embarrassingly loud.
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And all of those toxic exhaust fumes would be
able to escape the confines of the manifold and
find their way into the interior of the vehicle.
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Welded tubular steel exhaust manifold
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The tubular steel exhaust manifolds have better
flow and they are most often found in
high-performance vehicles.
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This style exhaust manifold is usually made from
mild steel or stainless steel depending on the
preference of the car manufacturer.
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The mild steel is cheaper to produce and at the
same time, it doesn't last as long as a stainless
steel exhaust manifold.
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The steel tubing that the manifolds are
constructed with is welded to the cylinder head
flange and at all of the points where the tubing
intersects.
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Many tubular exhaust manifolds also have built-in
flex pipes that allow the different areas of the
manifold to flex independently with the
temperature changes.
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Remember
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Both the cast iron and tubular steel exhaust
manifolds will have cracks as they are subjected
to excess heat throughout their lives.
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So, it is required to always inspect the exhaust
manifold and if found to be malfunctioning, then
get it replaced.
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