The topic comes up from time to time on when to change different parts of the engine and drive train parts. Usually they specify that the changes should be based on miles traveled or time, ie. 90,000 miles or 5 years for a timing belt.
I got to wondering how many revolutions an engine would make during that 90,000 miles. I looked around and couldn't find what I wanted, so I made up a spreadsheet to solve the problem. I started out with the tire circumference, and then divided that into the number of inches in a mile, and then multiplied that by the numbers of miles driven.
My car a 2000 Camry 1MZ-FE came stock with 205/65 - R15 tires on it and when I calculated how many revolutions the engine has gone I about fell out of my chair.
Here's what I came up with:
A tire with a circumference of 80" (205/65 R15) and 230,000 miles on the odometer, will have rotated a minimum of 511,869,000 times
Circumference (inch) 80.00
Revolutions per mile 792
Transmission Ratio 2.810
Engine revs/mile 2,226
Miles on Odometer 230,000
Total Engine Revolutions
511,869,600
The calculations are probably under the actual number of engine rotations and will probably vary widely depending on your driving style.
If you want a spreadsheet so you can calculate your own engine revolutions based on your tire size, you can download it here.
https://docs.google.com/uc?export=do...&revision=true
All you will need to do is to enter the circumference of your tire, the final transmission drive ratio, and the number of miles traveled. The spreadsheet also contains a table with all the drive ratios of various models of Camry transmissions.
You will also need to adjust the calculated numbers for cam gears (2x) and other rotating parts based on the size of the driven pulley in relation to the drive pulley.
I'm pretty sure all the calculations are correct, but if you find an error someplace, let me know and I'll fix it.
.
Linear Mode
