關於汽車問題

terrible answers. This person knows nothing about cars at all.

唔好學錯野:
活塞係piston, 每個氣缸入面只有一個
而valve係氣閥, 每個氣缸入面可以有2~4個, 如果電單車engine, 曾經試過有一個氣缸入面有5個valve, 3個入氣, 2個出氣.

請不要教壞人,我只提供第一條問題資料:
A V12 engine is a V engine with 12 cylinders in two banks. Like a straight-6, this configuration has perfect primary and secondary balance no matter which V angle is used and therefore needs no balance shafts. A V12 with two banks of six cylinders angled at 60° or 180° from each other has even firing with power pulses delivered twice as often per revolution as, and is smoother than a straight-6 because there is always positive net torque output, as with an engine with 7 or more cylinders. This allows for great refinement in a luxury car; in a racing car, the rotating parts can be made much lighter and thus more responsive, since there is no need to use counterweights on the crankshaft as is needed in a 90° V8 and less need for the inertial mass in a flywheel to smooth out the power delivery. In a large, heavy-duty engine, a V12 can run slower than smaller engines, prolonging engine life.