Question

Why are suction and exhaust pressure in ic engien not atmospheric pressure?

Answer 1

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However, a little back pressure is a good thing. In fact, it helps. The right size pipe is large enough to breathe well but small enough to create a high exhaust flow. Steps in the exhaust system also create negative pressure waves that travel back to the cylinder and help empty the cylinder of those gases.

Answer 2

Explanation:

However, a little back pressure is a good thing In fact, it helps The right size pipe is large enough to breathe well but small enough to create a highly exhaust flow . Steps in the exhausts you system also create negative pressure waves that travel back to the cylinders and help empty the cylinder of those gases.