How many engines do cars habe

[Anthonyvance]

Conclusion.
Lack of Power.

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Family Handyman.
Typical bore and stroke sizes are 70–100mm (roughly 3–4 in). You might think making a more powerful engine is simply a matter of choosing a bigger bore and stroke, but there's much more to it than that, and there clearly have to be compromises (for example, you can't make small cars with enormous cylinders). In practice, the bore and stroke affect a number of different things, not just how powerful and efficient the engine is overall, but how much power it makes at different speeds: whether it's optimized for high power at high speed (as in a race car) or high power and fuel economy at lower speeds (as in a long-distance truck). If the bore and stroke measurement is more or less the same, the engine is described as square . A bigger bore and a shorter stroke gives us what's called an oversquare (short-stroke) engine. It has bigger valves for shifting more gas through the cylinders at higher speeds, so it can can make high power at higher rpm, and it's a good arrangement for a race car or a superbike (powerful motorbike). A smaller bore and a longer stroke, in what's called an undersquare (long-stroke) engine, gives us more power at lower revs, which is great for a slow-moving, heavy truck or a heavier motorbike.
Without a working engine, a car is basically worthless. You are not going to make it out of the garage if your car engine is not working. Well, you might, but you won’t get very far.
Jil McIntosh specializes in new-car reviews, auto technology and antique cars, including the two 1940s vehicles in her garage. She is currently a freelance Writer at Driving.ca since 2016.
There's no doubt that Otto's gasoline engine was an invention of genius—but it's now a victim of its own success. With around a billion cars on the planet, the pollution produced by vehicles is a serious—and still growing—problem. The carbon dioxide released when fuels are burned is also a major cause of global warming. The solution could be electric cars that get their energy from cleaner sources of power or hybrid cars that use a combination of electricity and gasoline power.