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Old 11-21-2020, 09:59 AM   #41
old Tom
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Default Re: Cubic inch question

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At the risk of offending some. A hillbilly decided to go to college to study math. He comes home on holiday. Ma asks what he learned in math. He says; "Ma, I learned Pi r squared". Ma says; "No no son, Pie are round".
corn bread r square
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Old 11-21-2020, 12:28 PM   #42
GB SISSON
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"Just don't ask me to offset grind your merc crank to 4 1/8"

If you can do that with a router and string I'd like to see it.
C'mon Mart.... That takes two strings and an angle grinder. Can someone show me the cubic inch displacement of my stationary engine? One cylinder, 6" bore, 12" stroke.
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Old 11-21-2020, 12:58 PM   #43
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Default Re: Cubic inch question

Yeah. I'll walk you through it.

bore * bore * pi /4 *stroke*no of cylinders

6*6 = 36
36* 3.1416 = 113.0976

113.0976/4 = 28.2744

28.2744 *12 =

339.2928 * 1 = 339.2928

So your single cylinder motor is 339.3 cu in.

Last edited by Mart; 11-21-2020 at 01:06 PM.
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Old 11-21-2020, 01:03 PM   #44
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Default Re: Cubic inch question

Duplicate.
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Old 11-21-2020, 10:48 PM   #45
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Default Re: Cubic inch question

Thank you very much Mart! The brass tag on it states that it produces 8 hp at 300 rpm. I run it at 75 rpm.
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Old 11-21-2020, 10:57 PM   #46
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Thank you very much Mart! The brass tag on it states that it produces 8 hp at 300 rpm. I run it at 75 rpm.

I was thinking hit and miss till you said that.
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Old 11-21-2020, 11:09 PM   #47
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I was thinking hit and miss till you said that.

https://www.youtube.com/watch?v=ot5EaCZk5vo
Hit n Miss I did a lot of tuning to get it this slow. It was given to me because it was stuck and the head was missing so I freed it and made a wood pattern for the head and had it cast. In 1989.
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Old 11-22-2020, 06:26 AM   #48
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Default Re: Cubic inch question

You could’ve been getting a load of laundry done while you were there.......I think watching and listening to one of those motors is to me, the most relaxing thing.....kinda like watching cows graze and chickens peck the dirt.....that’s quite a collection you have Gary!!!!.....Mark
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Old 11-22-2020, 11:32 AM   #49
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Default Re: Cubic inch question

The big stover is mine and I have a 3hp as well as some old air cooled stuff. I sold the gas powered maytag washer. About 5 of us set up in that area every year for the last 34 years at Lynden Wa, in August. I feel smarter now that I understand that formula. Thanks
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Old 11-22-2020, 12:07 PM   #50
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Default Re: Cubic inch question

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I feel smarter now that I understand that formula. Thanks
In your case: 6 X 6 X 12 X .7854 = 339.2928

DD
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Old 11-22-2020, 12:22 PM   #51
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In your case: 6 X 6 X 12 X .7854 = 339.2928

DD
Wow! Too easy! I'm starting to like this math thing.
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