America’s Cars Are Getting Faster and More Efficient

Re:America’s Cars Are Getting Faster and More Efficient by asteli on Thursday May 18, 2017 @04:41PM (#14370917)

We get spoiled a bit by how amazing noise suppression in modern vehicles is. A modern car rolling 60 MPH down the highway makes almost no engine noise, it's all aerodynamic whoosh and tire noise. Pretty impressive for a machine that's creating several thousand tiny explosions per second.

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Re:America’s Cars Are Getting Faster and More Efficient by mtm on Thursday May 18, 2017 @05:04PM (#14371078)

Actually, assuming about 2000 RPM at 60 mph in a 4 cylinder car you are getting more like 17 detonations/second

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Re:America’s Cars Are Getting Faster and More Efficient by asteli on Thursday May 18, 2017 @08:07PM (#14372073)

Shame on me! Mixed up my units.

Note that we haven't accounted for _n_ cylinders either. For a 4 cylinder engine you'd average ~67/second. :)

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Re:America’s Cars Are Getting Faster and More Efficient by merraksh on Thursday May 18, 2017 @08:07PM (#14372076)

2000 / 60 seconds * 4 cylinders ~ 133 detonations/second.

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Re:America’s Cars Are Getting Faster and More Efficient by asteli on Friday May 19, 2017 @12:02AM (#14372936)

Maybe in a 4cyl 2-stroke! In 4-stroke engines, a cylinder will fire once every other rev.

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