"Part Load" is short for partial load.
"Load" is when the engine is doing work. Whatever work the engine is doing places a "load" on the engine which resists the engine's turning motion and slows the engine down so it requires more throttle to maintain speed.
"Partial load" is when the engine is doing work that would stall the engine at idle, but does not require full throttle, just partial throttle.
A good example would be a car traveling at highway speed or up a slight grade.
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.
Hottest part is the piston crown....
The bearing?
The combustion chamber. The temperature of the air/fuel mixture combusting is approximately 1800 degrees f.
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
The exhaust valves are the hottest component of the exhaust system of an internal combustion engine.
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.