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In Reply to: RE: Engine Math...a little posted by pictureguy on April 20, 2021 at 10:39:02:
"the rule maintains.....For any given level of development, MORE cylinders should produce more power. Greater surface area of pistons for any fixed displacement is why"
Only to a point. A circle twice the diameter has four times the area.
Like a 12" pizza, pi*R^2, about 113 sq. in.
A 16" pizza about 201 sq. in.
The lowly 8" pizza only about 50 sq. in.
What a difference the lowly 4" makes.
So the only main difference is that the peak PSI hits more in the sweet spot of the various cylinders. If it was only the surface area of the piston, a huge one cylinder would be best.
For a real world example, start with an old train, steam. They only had two huge pistons BUT they had steam on tap to keep feeding it until it is really done, extracting the last bit of power out of it. You would have to go on an antique train to see i t, the modern ones are not like that. Newer trains are actually electric. They have a huge diesel connected to a generator and a motor moves the train. They found this to be the best transmission. Really, you want to design an automatic tranny for those ? Eeesh, no way Jose. A thousand clutch plates and sprags ? At least, and I still doubt it would be as reliable.
Anyway, if you were quoting a real rule there, it is only valid in a certain range.
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Follow Ups
- RE: Engine Math...a little - JURB 15:08:09 04/21/21 (1)
- RE: Engine Math...a little - pictureguy 17:24:52 04/21/21 (0)
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