What is the exhaust under the engine?
On a general engine, you can find a pipe on the cylinder or just the cover to guide the ground or the inlet. The pipe is the lower exhaust pipe, and the engine connected to the exhaust is called a respirator. Generally, there is a function of eliminating exhaust gas and lubricating oil to condense and return (a small pipe is drawn directly to the oil sump).
Although the piston piston ring seal, but the seal is not absolute, more or less will have the gas jumped out, but also the high temperature of the evaporation of lubricating oil, so that the crankcase pressure will be higher and higher. In order to keep the crankcase pressure balanced, the crankshaft ventilation is required, that is, the lower exhaust
And the exhaust will generally be there, no problem, it will not be great. When you find the exhaust is unusually large, Congratulations, your engine 80% has worn out earlier
