I just never thought about it

big hunter · Aug 28, 2010

My wife and I took my son to college. The engine ran at 2,500 rpms almost the whole time. it took us around 18 hrs round trip. The engine turned over 2,700,000 times. The pistons went up 1,350,000 times and down another 1,350,000 times. Never thought about it before, but I think it's amazing. Over the life of a vehicle the numbers would be unbelieveable.

jim johnson · Aug 28, 2010

Don't have much to do, do you?

Jim

WGWKy · Aug 28, 2010

An't that cruise control great!

big hunter · Aug 28, 2010

well sitting in the car for 9 hrs. listening to the hummmm makes the brain wonder or go to sleep.

Coloken · Aug 28, 2010

"The engine turned over 2,700,000 times. The pistons went up 1,350,000 times and down another 1,350,000 times."
Nope. the pistons went up and down 2,700,00o times.
You forgot the exhaust stroke.
Just to be picky.
If you want to be impressed, count how many times you heart beat during that time.
Kenny

Goose · Aug 28, 2010

I recall reading somewhere once that if an engine used one drop of oil ever revolution, it would consume something like a quart every three miles, or something like that.

Janicholson · Aug 28, 2010

You are correct (it would have fired 1/2 as many times per cylinder, but the strokes were there)
If it made 2.7 million revolutions it made 2.7 million ups, and 2.7 million downs.

Allan in NE · Aug 28, 2010

And here all along, I thought those jokers stopped and rested fer a bit. :>)

Allan

Janicholson · Aug 28, 2010

When they do they usually cause an audible racket if the other pistons continue to stroke I think they are just complaining too much like the kid hired to move small squares sitting under the wagon. Jim

john in la · Aug 28, 2010

And assuming it was a 8 cylinder engine the coil fired 10.8 million times for the 2.7 million revolutions of the crank.

That is over 166 times a second.

big hunter · Aug 28, 2010

nope think again

big hunter · Aug 28, 2010

I beg to differ...if the crank starts the rotation when the piston is at tdc and turns 180 degrees then the piston would be at the bottom of the stroke...then the crank turns another 180 degrees to finish one revolution of the crank the piston would be back up to the top....one reolution of crank hence, 2,700,000 revolutions and hence, 1,350,000 down strokes and 1,350,000 up strokes

Pete in MD · Aug 28, 2010

Think about it again. In one crank revolution the piston goes up once and down once. In two revolutions, two ups and two downs. In 2,700,000 revolutions......

Neil Powell · Aug 28, 2010

If a tractor engine ran 10,000 hours at 1667 RPM, the crank would go round 1 billion times.

greygoat · Aug 28, 2010

A General Motors, (EMD) locomotive on Burlington
Northern Santa Fe can go from Chicago to Seattle
and back to Chicago again in 1 week, on a UPS or
U.S. Mail train. At 60 miles per hour the 16V645
engine, (V16, 645 cubic inch per cylinder) is
running at 800 RPM, using 200 gallons of diesel
per hour, at 3200 horsepower!
How fast is the crankshaft turning ?

pete 23 · Aug 28, 2010

And a John Deere two popper at 1000 rpm will have nearly same piston speed as 560 running 1800 rpm. Old argument from way back when.

Old Roy · Aug 28, 2010

That wouldn,t be hard to figure 1,080 min to 18 hr.
Average heart rate around 80 bpm (not allowing for the occasional mini skirt, short shorts ,or a semi revealing top)is only 86,400 beats.

flying belgian · Aug 28, 2010

And even if you were going 60 mph. At the point where the tire was touching the pavement it wasn't turning at all.

just another old geezer · Aug 28, 2010

800 rpm

oldart · Aug 28, 2010

800RPM it is a long furmule to working it out..
just read what you said..

Allen57 · Aug 29, 2010

(quoted from post at 17:28:33 08/28/10) A General Motors, (EMD) locomotive on Burlington
Northern Santa Fe can go from Chicago to Seattle
and back to Chicago again in 1 week, on a UPS or
U.S. Mail train. At 60 miles per hour the 16V645
engine, (V16, 645 cubic inch per cylinder) is
running at [b:404188f99c]800 RPM[/b:404188f99c], using 200 gallons of diesel
per hour, at 3200 horsepower!
[b:404188f99c]How fast is the crankshaft turning [/b:404188f99c]?

I just never thought about it

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