


Finding cubic inches
Ok guys I've asked the question on how to know the cubic inches of an engine once it's been bored . I have a 502 Chevy bigblock ( of course) just had it punched .90 has stock stroke and crank can someone give me the formula for the true cubic inch of this engine ?

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Just did this on another site...
There are many "witch doctor" formulas out there. There is one correct one. Pi x R(2) x H x no. of cylinders (high school geometry, volume of a cylinder) Pi = 3.14159 (close enough for our purposes) R = bore x .5 H = stroke Jim 
The Following User Says Thank You to Mr. PBody For This Useful Post:  
68NovaSS (11082013) 


Simple Google search, there are tons of calculators available. Here's one:
Calculate Cubic Inch Displacement If you started out with a 4.466", 4" stroke (502 c.i.) and bored it to 4.556" you have a 522 c.i. motor (521.68). Whether you can safely take a 502 block to .090 I have no idea, I assume you can.
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(.7854) x 4.556 x 4.556 x 4 x 8 = 521.68 cubic inches.
The .7854 is one/fourth of pi and eliminates messin' with squaring the radius of the bore. Mr. Peabody, this is hilarious.... "There are many "witch doctor" formulas out there. There is one correct one." You need to get out more. 
The Following User Says Thank You to vinniekq2 For This Useful Post:  
gonefishin' (11092013) 


3.14 = pi is plenty close enough. Easiest is to use online calculator plug in the numbers and hit enter. But that dont exercise your brain pan like doing it long hand tho. Wallace racing has a ton of calculators including one for cid http://www.wallaceracing.com/cid.php



Sorry dude. Spent too much time in school, I guess. It's always best to stick to what is known to all and "works". The formula you use may work, but is much harder to remember. We were all taught Pi xR(2) x H. That's the geometric formula for the volume of a cylinder. Nothing more. Why muddy the water with abstract?
PAX Jim 


Memory can be funny some cannt remember the firing order of a chevy and might not have learned the formula of a cyl either. But if someione remembers a different formula for cid than using the volume of a cylinder, nothing I see wrong with that. Its the answer being correct that matters.



standard firing order of small block chev is
1 8 4 3 6 5 7 2 1 8 7 3 6 5 4 2 is the second optional firing order used in sbc many custom firing orders have been tried for various reasons the ".7854" is the most common way of calculating displacement. 


Want to talk witch doctor, the 4/7 swap for a street chevy is a good one.. Nowhere near as common as the smal;l fords 15426378 and 13726548 firing orders. Then theres the LS 18726543 but I think every body gets the point. Ican agree .7854 times bore squared times stroke times # of holes is a very common formula and saves a couple key strokes but I cant say it (or any) is the MOST common. Again if it gets myou the right answer is what matters.



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