Prevent Reversion
Almost any car can run without exhaust pipes of any kind, but no engine will run for long without a manifold. The exhaust valve is still slightly open when the engine's intake valve opens and the piston goes down (sucking in fresh air and fuel from the intake valve). Without a manifold, all of the cylinder's combustion gases would rush out in a hurry, making the exhaust valve (very briefly) the path of least resistance for airflow into the cylinder. Along with air and fuel from the intake, the engine would suck cold air in through the exhaust valve, exponentially increasing combustion chamber temperature and quickly melting the exhaust valve, valve seat and piston top. This phenomena is known as reversion and is a known engine killer
Read more : http://www.ehow.com/list_6465841_functions-exhaust-manifold_.html
Prevent ReversionAlmost any car can run without exhaust pipes of any kind, but no engine will run for long without a manifold. The exhaust valve is still slightly open when the engine's intake valve opens and the piston goes down (sucking in fresh air and fuel from the intake valve). Without a manifold, all of the cylinder's combustion gases would rush out in a hurry, making the exhaust valve (very briefly) the path of least resistance for airflow into the cylinder. Along with air and fuel from the intake, the engine would suck cold air in through the exhaust valve, exponentially increasing combustion chamber temperature and quickly melting the exhaust valve, valve seat and piston top. This phenomena is known as reversion and is a known engine killerRead more : http://www.ehow.com/list_6465841_functions-exhaust-manifold_.html
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