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31-05-2021
11:24 AM

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31-05-2021
11:24 AM

Piston Slap: Pi are square in the Studebaker's engine displacement | Hagerty Media

Kevin writes: My '64 Studebaker Daytona has its original 289 cid V-8 and has had the cylinders bored out 0.060. Can you tell me what the displacement would be now? Sajeev answers: Oh man, I am totally getting flashbacks to grade school math class! Calculating engine displacement requires determining three values: The number of cylinders, [...]

https://www.hagerty.com/media/advice/piston-slap/piston-slap-pi-are-square-in-the-studebakers-engine...

https://www.hagerty.com/media/advice/piston-slap/piston-slap-pi-are-square-in-the-studebakers-engine...

3 REPLIES 3

07-07-2021
05:19 PM

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07-07-2021
05:19 PM

"which is π times the radius, squared"

The comma in your expression of the formula implies the wrong calculation IMHO .

The formula is "pi times R to the second power" which is executed as: pi times (radius squared). You have to square the radius before multiplying by pi.

Your original statement gives the impression of: "(pi times radius), squared" which gives a vastly different and incorrect answer. Perhaps to be more clear express as: "π, times the radius squared"

Cheers

The comma in your expression of the formula implies the wrong calculation IMHO .

The formula is "pi times R to the second power" which is executed as: pi times (radius squared). You have to square the radius before multiplying by pi.

Your original statement gives the impression of: "(pi times radius), squared" which gives a vastly different and incorrect answer. Perhaps to be more clear express as: "π, times the radius squared"

Cheers

07-07-2021
05:22 PM

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07-07-2021
05:22 PM

Also reminds me of the scene from the Beverly Hillbillies, when Jethro is explaining to Uncle Jed what he learned in school that day:

Jethro: "I learned pi R squared"

Uncle Jed: "Pies ain't square boy, They's round. Corn bread's square"

Jethro: "I learned pi R squared"

Uncle Jed: "Pies ain't square boy, They's round. Corn bread's square"

07-07-2021
05:34 PM

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07-07-2021
05:34 PM

Oh yeah, "π, times the radius squared" is the accurate and clearer way to write out a formula. I made that change now.

Still can't believe I had to write that formula out in the first place, but whatever!

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