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How to figure C.I.D.

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shaggy

01-17-2003 06:54:22




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Hello I just wanted to know if I am figuring cubic inches right. bore x bore x stroke x number cylinders x.7854. I won't put the spec's because you guy's get more out your push lawn mower's. Thanks.




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shaggy

01-21-2003 22:16:27




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
Thanks everybody for the help. I figured it up and I have a grand total of 132cid. Hey its a small tractor. Thanks again



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Farmall Daddy

01-19-2003 10:30:16




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
I do belive that you take the bore X the stroke X the number of cylinders.



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What?

01-19-2003 14:03:13




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 Re: Re: How to figure C.I.D. in reply to Farmall Daddy, 01-19-2003 10:30:16  
So a 5" bore x 7" stroke 4 cylinder motor would be 5x7x4=140 CID. Yep, sounds right to me.



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Chevy2500

01-20-2003 06:45:28




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 Re: Re: Re: How to figure C.I.D. in reply to What?, 01-19-2003 14:03:13  
That makes my Chevy 350 about 6.5 bore x 6.75 stroke x 8 cylinders. WOW



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FARMALL BOY****THE EASIEST WAY****

01-18-2003 10:54:13




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
go to>Link



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Tony630

01-17-2003 14:38:30




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
Make it easy on yourself - bore X bore X stroke X .7854 X no. of cylinders = Cubic Inches.....

Tony630



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Eric

01-17-2003 09:27:58




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
This link will calculate displacements and more.

http://www.appletreeauto.com/engcalc.htm



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pcy

01-17-2003 09:05:55




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
you guys have me cornfused here is how we do it, punch .7854 in your calculater mutiply x your bore x your bore again x your stroke x your no of clynders, example .7854 x 4.3 x 4.3 x 4.75 x6 tells you a 1066 ih cube 413.8783



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Ohio M Puller

01-17-2003 08:48:10




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
Here is the easiest way:
Take your bore size:
ex: 5"
divide by 2
equals 2.5" then multiple that to itself, 2.5 x 2.5 = 6.25 then multiple that to PIE (3.14) which is 19.625. Next you multiple that to your STROKE ex: 6" that is 117.75". Lastly, you multiple that to how many cylinders you have ex: 6 that is 706.5 that is your cubic inches.

(Bore radius)^2 x 3.14(PIE) x Stroke x No. of Cylinders = Cubic inches

Ohio M Puller
Deal With It Pulling

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Ohio M Puller

01-17-2003 08:48:06




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
Here is the easiest way:
Take your bore size:
ex: 5"
divide by 2
equals 2.5" then multiple that to itself, 2.5 x 2.5 = 6.25 then multiple that to PIE (3.14) which is 19.625. Next you multiple that to your STROKE ex: 6" that is 117.75". Lastly, you multiple that to how many cylinders you have ex: 6 that is 706.5 that is your cubic inches.

(Bore radius)^2 x 3.14(PIE) x Stroke x No. of Cylinders = Cubic inches

Ohio M Puller
Deal With It Pulling

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Ohio M Puller

01-17-2003 08:47:58




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
Here is the easiest way:
Take your bore size:
ex: 5"
divide by 2
equals 2.5" then multiple that to itself, 2.5 x 2.5 = 6.25 then multiple that to PIE (3.14) which is 19.625. Next you multiple that to your STROKE ex: 6" that is 117.75". Lastly, you multiple that to how many cylinders you have ex: 6 that is 706.5 that is your cubic inches.

(Bore radius)^2 x 3.14(PIE) x Stroke x No. of Cylinders = Cubic inches

Ohio M Puller
Deal With It Pulling

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Slo

01-17-2003 08:25:10




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
I use bore x bore, divide by four. Then multiply by pii, 3.14 take that and multiply by stroke, then that number by number of cylinders. For example, a stock MM U has 283 cubic inches. 4 1/4" bore by 5" stroke with 4 cylinders

4.25 x 4.25 = 18.06
18.06 / 4 = 4.51
4.51 x 3.14 = 14.16
14.16 x 5 = 70.8
70.8 x 4 = 283.2

Hope this helps



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Tom

01-17-2003 07:38:35




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
Math is not my favorite thing so I go to Antique Tractor pulling web site. They have a c.i.d caculator even tells you liters.



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WTW

01-17-2003 07:19:23




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 Re: How to figure C.I.D. in reply to shaggy, 01-17-2003 06:54:22  
Use .7854 not 7854. The way I do it is A x S X N = D. A is area, To achieve it take the bore X the bore X .7854. Example would be if you had a 6 cylinder engine with a bore of 4" diameter and the stroke was 4.5. First figure the area. 4 X 4 X .7854 = 12.5664 (area) Then take the Area X the Stroke, 12.5664 (Area) X 4.5 (Stroke) X 6 (Number of cylinders) = 339.2928 (Displacement)



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Jerry

01-17-2003 16:37:52




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 Re: Re: How to figure C.I.D. in reply to WTW, 01-17-2003 07:19:23  
If you have heads with the valves recessed up in the heads I believe you have to add the volume of the recess. I gave away the latest Green Magazine but I believe they had an article that described how to seal off the valves and pour into the heads water that after you pour it out can be calculated for volume. I believe that the moline page has a chart that gives the ci for each of there stock head's along with the compression that was tested when new and stock.

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C.I.D., not compression ratio

01-18-2003 06:27:49




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 Re: Re: Re: How to figure C.I.D. in reply to Jerry, 01-17-2003 16:37:52  
Volume of the heads is for figuring compression ratio, not cubic inches
Pi x R2 x stroke x # cyl is cid

volume with piston at bottm DC over volume with piston at T.D.C is compression ratio

Get a good calculator, don



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G Taylor

01-18-2003 19:15:22




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 Re: Re: Re: Re: How to figure C.I.D. in reply to C.I.D., not compression ratio, 01-18-2003 06:27:49  
There's a person who understands how things work.



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