Need math help.

DLStryker

Member
Oct 18, 2012
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How many cc's doses a 3mm stroker crank add to a 240cc big bore? I believe the cylinder has a 72mm diameter.
 
So I turned to the internet. I see pie r squared is the formula. I calculated 12.21cc's. Can anyone confirm this?
 
I thought cc’s were calculated with the millimeter size of your piston and the 3 mm stroker would just add more hp,
 
No flaws in the above math.....

http://www.blasterforum.com/threads/cylinder-bore-to-ccs.23137/

Here's a list of all bore sizes converted to cc's


Bore....over.....stock stroke....+3mm
66.00 - stock = 195CC - 205CC

66.25 - .010 = 196CC - 207CC

66.50 - .020 = 198CC- 208CC

66.75 - .030 = 199CC - 210CC

67.00 - .040 = 201CC - 212CC

67.25 - .050 = 202CC - 213CC

67.50 - .060 = 204CC- 215CC

67.75 - .070 = 205CC - 216CC

68.00 - .080 = 207CC - 218CC

68.25 - .090 = 209CC - 220CC

\/ big bore cylinder/sleeve \/

72.00 -........=232CC - 244CC

72.25 - .010 = 234CC- 246CC

72.50 - .020 = 235CC - 248CC


hopes this helps
 
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Sorry, respectfully say I think your response is flawed. Can you share the details of your calculations?

Respectfully you are wrong. You asked for help, I gave you the correct answers. If you don't know how to calculate it then how did you come up with my answers being wrong? I could put it on paper for you or type it out but after being told I am wrong I will keep you in suspense till you figure it out. Good luck
 
Respectfully you are wrong. You asked for help, I gave you the correct answers. If you don't know how to calculate it then how did you come up with my answers being wrong? I could put it on paper for you or type it out but after being told I am wrong I will keep you in suspense till you figure it out. Good luck
240 stock stroke on a big bore. You show 244 cc on a stroker with stock bore. In my math, I show that with the first mm of stroke. Then I took into account 3mm of stroke. Pie x radius - squared x mm of stroke.

The radius on 72mm bore is 36mm. 36mm squared it 1,296mm. This times pie of 3.14 equates to 4,069mm. So, to me, that is 4,069mm for the first mm of stroke. Take the 4069 times three and come up with 12,208 mm.... which is 12.2cc's.

Correct me if I am wrong please.
 
I'm sure link Awk posted is correct. Your error is that the first part of your calculations is for square area, flat surface, not the first MM of stroke.. you would multiply square area by stroke to get volume. Or square area by stroke INCREASE to get volume to add to stock CC volume.
 
Looks like we are all wrong!

The area of a cylinder is A=2 pie r h+2 pie r(squared)
upload_2018-2-16_9-12-33.png


So a 240 bore has 8,821mm of area with 3mm of stroke. Or 8.8cc's.

Below is the calculator of cylinder area.
https://www.google.com/search?sourc....64.psy-ab..0.18.1335...0i131k1.0.vDSmoNqaRqo
 
Is that Common Core Math ?
LOL :)

on my phone so I didn't do it