I drive a slightly older (2012) truck and when I start my engine, it takes a couple seconds to for the engine to turn over. If I shut down and restarted at every red light, it would probably be annoying to drivers behind me. New cars can basically restart the instant you touch the gas. The delay is hardly noticeable. What’s different?
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Cars with start-stop have starter motors designed specifically for that purpose. While your starter motor is only meant to turn over the engine once per trip, the one in a car with start-stop is more robust.
Starting an engine when warm is also considerably easier than cold because the lubricants are at the right temperature and there’s less resistance.
Such engines also have a trick where they will deliberately compress a piston or two at the top position so that when the starter turns the spark plugs will ignite and immediately get a detonation to help get the engine going.
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