Engines > Restoration of Model Engines
One lung FM Z 1 1/2 HP
Vixen:
--- Quote from: gipetto on June 04, 2024, 03:10:41 PM ---wolfram alpha says the volume of a cylinder of 4" diameter by 4" length is 6.28 cubic inches or 103cc
--- End quote ---
Who or what is wolfram alpha?
Pi * r squared * h says the volume is 50.272 cu inch or 823.81 cubic centimetres
crueby:
--- Quote from: gipetto on June 04, 2024, 03:10:41 PM ---wolfram alpha says the volume of a cylinder of 4" diameter by 4" length is 6.28 cubic inches or 103cc
--- End quote ---
My math comes up with 50.266544 cubic inches, 828.63417757 cc's. Your answer of 6.28 is way too small for a 4" bore. You forgot to square the radius, and then multiply by pi, and then the length of the stroke.
Kim:
I'm not an IC guy, but isn't the volume of a cylinder calculated (Pi) * R^2 * H? So if the R is 2", and the H is 4", I get
3.1415 * 2^2 * 4 = 50.264 in^3
and 1 in^3 = (2.54cm)^3 = 16.38cm^3
So I'd come up with ~823cm^3
Is it somehow different for engines?
Kim
----------------------------
Oops - my post overlapped with Chris's AND Mikes. And I think their answers are right.
gipetto:
--- Quote from: Vixen on June 04, 2024, 03:29:47 PM ---
--- Quote from: gipetto on June 04, 2024, 03:10:41 PM ---wolfram alpha says the volume of a cylinder of 4" diameter by 4" length is 6.28 cubic inches or 103cc
--- End quote ---
Who or what is wolfram alpha?
Pi * r squared * h says the volume is 50.272 cu inch or 823.81 cubic centimetres
--- End quote ---
It's a free AI tool for math, came out about a decade before chatgpt. wolframalpha.com. it has worked in the past for me, but i guess it's become abandoned and the results are not as good.
Geo46:
Hi All, based on the conversion charts that I just used ,and probably should have before I asked the question, it works out to be 50 cui +/- and 819 cci +/- , so assuming that it is 50 cui. what should I consider for a carb?
Thanks
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