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Old 01-25-2009, 05:53 AM
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Smart person needed to check my numbers

I am trying to calculate the total piston travel in our 6.0 and am using a stroke of 4.13 times engine rpm divided by six equaling travel per min in feet, if this is correct than our engines pistons are traveling a distance of approx 15.6 miles for every hour at 2,000 rpms.

The question of course, is this correct?

And, yes I know, I have no life.
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Old 01-25-2009, 05:56 AM
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I can't help you but I still want to know the answer
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Old 01-25-2009, 06:15 AM
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((((4.13 x 2) x 2000) / 12) x 60) / 5280 = 15.6439 piston miles traveled.

Last edited by jbawilliams; 01-25-2009 at 07:19 AM.
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Old 01-25-2009, 06:23 AM
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Looks right to me!

rpm x stroke (inches) / 6 = piston speed in feet-per-minute

2000 x 4.13 / 6 = piston speed in feet-per-minute = 1376.67 ft/min

1376.67 x 60 = piston speed in feet-per-hour = 82600 ft/hour

82600 / 5280 = piston speed in mph = 15.64 mph

Here's a little table from Popular Hotrodding's website, for gas engines at least:

Maximum Mean Piston Speeds
Factory cast-iron cranks 3,750 ft/min
Aftermarket cast-steel cranks 4,500 ft/min
Factory forged cranks 4,600 ft/min
Budget aftermarket forged cranks 4,800 ft/min
Typical race aftermarket cranks 5,500 ft/min
High-dollar custom endurance race cranks 6,000 ft/min
ProStock/Mountain Motors 7,500 ft/min
Formula One 7,500+ ft/min

Note that this is the average piston speed. The peak speed is higher but how much higher and when it occurs during the crank rotation depends upon the rod length too.
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Old 01-25-2009, 10:37 AM
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So a ballpark guess with our 24k 6.0 is that the pistons have traveled 5,100 miles, give or take-I used 40 mph as an average, which is probably high, and tried to adjust as best I could-using the average percentage difference between 60 & 40 mph.

Amazing whats going on in there when you really start thinking of things, sort of pushes one towards synthetic oil also..
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Old 01-25-2009, 11:52 AM
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Makes everyday average joes like me want to buy the best oil out there for our trucks!
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Old 01-25-2009, 12:06 PM
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is that just goin up? or calculating up AND down?
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Old 01-25-2009, 02:35 PM
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blowinsmoke7.3, I was going between dino and synthetic but now I am thinking synthetic is the only way to go.

rodneykolk, total travel up and down.
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