You will have a smooth running engine when the rotating assembly is balanced.
The reproduction must be species specific. I guess it is a safe guard against all kinds of mutant creatures. For the same reason a Toyota piston won't fit into a Chevy engine block - they are not compatible. The species must be the same.
multiple cylinders create better torque, efficiency, and are better balanced. In addition, the same identical size engines would have large differences in piston size/weight, rod size/weight, bearing stress, etc.
Jet-powered aircraft land on the same airports as piston-engine aircraft.
It is used as a compressor. It has the same advantages over a piston compressor as a gas turbine engine has over a piston engine. i.e. no valves, much lower part count and much greater efficiency.
A 'reciprocating engine' is just another name for a piston engine as opposed to a jet. Technically, the engine works just like the one in your car, with a piston moving in and out of a cylinder. The difference may be that the aircraft engine may have it's cylinders arranged in a circle ( radial engine) but the action is just the same.
The bore refers to the Inside diameter of the cylinder. The Piston will be nearly the same diameter, with the piston rings making up the difference. Convert the bore to area by multiplying by pi and dividing by four, and multiply by the stroke and the number of cylinders and you have the volume displacement of the engine.
In a freewheeling engine, the piston tops and the valve bottoms do not share the same mechanical space, even if the timing belt or chain breaks.
By interference, if you are referring to the valves. The 1.8 liter is a non interference engine. If the timing belt brakes, then the valves do not interfere with the piston. They do not try and occupy the same space. The 1.9 liter engine is an interference engine. If the timing belt breaks then the valves will occupy the same space as the piston and they will hit each other.
it consist of 8 piston in v shape that are attach to the crankshaft and the rest of the process is same compare to the other engine
No, it is not. The center of the crank end of the conrod IS a SHO (when the angular velocity is Const of course) , but the piston motion (i.e. piston pin) is NOT a SHO along the same axis. Well known fact in engine design.
thats the same engine and same weight.
Combustion piston engines can have two different work cycles, 2-stroke and 4-stroke. 2-stroke tends to have a better power to weight ratio, but pollute more. A 4-stroke outboard is simply an outboard engine that works the same way as a car engine.