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B cubic inches.

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kemper

02-22-2000 19:53:48




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How many cubic inches would a JD B have if it was bored to 090? or 125?




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Brandon Gantt

02-23-2000 12:19:56




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 Re: B cubic inches. in reply to kemper, 02-22-2000 19:53:48  
I building a B to 259 cubes. I started with 175 cubes. I went from (b)4.5 by (s)5.5 to 4.685 by 7.5.



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Dave Wickman

02-23-2000 07:28:30




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 Re: B cubic inches. in reply to kemper, 02-22-2000 19:53:48  
Kemper, 1935-1938 Model "B" 4.25 Bore X 5.25 Stroke = 149 Cubic Inch .045 Oversize = 152 CD .090 Oversize = 155 CD .125 Oversize = 159 CD. 1939-1946 Model "B" 4.50 Bore X 5.50 Stroke = 175 Cubic Inch .045 Oversize = 178 CD .090 Oversize = 182 CD .125 Oversize = 185 CD. 1947-1952 Model "B" 4.6875 Bore X 5.50 Stroke = 190 Cubic Inch .045 Oversize = 193 CD .090 Oversize = 197 CD .125 Oversize = 200 CD. Now a little food for thought my first John Deere Model "B" Puller has a 5.125 Bore and a Stroke of 6.75 Yielding total Cubic Inch of 278. The "B" that I am in Process of Building right now for my son will have a bore of 5.125 and a stroke of 7.5 Yielding the total of 309 Cubic Inch. Pretty crazy what can be done with these old tractors!! Dave

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Formula

02-22-2000 21:07:16




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 Re: B cubic inches. in reply to kemper, 02-22-2000 19:53:48  
Bore x Bore x .7854 x stroke x 2



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Kemper

02-23-2000 15:51:28




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 Re: Re: B cubic inches. in reply to Formula, 02-22-2000 21:07:16  
Thanks to all of you for the info on the cubic inches!!



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DrCyKosis

02-23-2000 14:46:10




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 Re: Re: B cubic inches. in reply to Formula, 02-22-2000 21:07:16  
The correct formula that can be applied to any reciprocating engine is:

Bore squared
divided by 4
multiplied by Pi
multiplied by Stroke
mutiplied by number of Cylinders



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Bruce Banning

02-23-2000 03:33:38




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 Re: Re: B cubic inches. in reply to Formula, 02-22-2000 21:07:16  

JD B's had 3 different size engines depending on the year. If you will give a serial #, the engine displacement can be determined.



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