Hottest part is the piston crown....
The exhaust valves are the hottest component of the exhaust system of an internal combustion engine.
The combustion chamber. The temperature of the air/fuel mixture combusting is approximately 1800 degrees f.
Reciprocating engines (piston engines) are internal combustion engines. Rotary engines ( Wankel engine) is also an internal combustion engine. In general, all types of engines in which the combustion chamber is an integrating part of the engine is considered a internal combustion engine.
The bearing?
Piston
Piston.
There is an engine block which houses all the moving parts of an internal combustion engine, and a cylinder which is a part of that block, the cylinder is where the piston moves inside and where combustion takes place.
The crankshaft is part of a piston engine, which can be either an internal combustion engine (one that runs on gasoline, diesel, propane, natural gas or carbon monoxide) or an external combustion engine (a steam engine). The pistons are connected to the crankshaft through connecting rods. The pistons turn the crankshaft, which creates the rotating motion you bought the engine for.
The internal combustion engine was invented in 1876 by German engineer Nikolaus August Otto. Otto's engine, commonly known as the "Otto engine," was the first successful four-stroke engine and revolutionized the way people think about and use engines. The internal combustion engine has since become a crucial technology for powering everything from cars and boats to generators and airplanes.
it is called a piston
It was not invented as part of anything, but as an engine in its own right for powering other machinery - including though not solely nor at first, cars.
Very quickly an uncooled engine will get so hot that the moving pistons weld themselves into their cylinders, ruining the engine. The oil system is part of that cooling process, by the way.