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Old 02-26-2002, 10:43 PM   #1
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a 350 bored .040 over equals what?

what is a 350 that is bored .040 equal to? 355 or a 358?
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Old 02-26-2002, 11:11 PM   #2
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Old 02-27-2002, 01:55 AM   #3
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.03 overbore is approx. 5 cubic inches. .040 is almost 7
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Old 02-27-2002, 08:50 AM   #4
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((Pi * (bore/2)^2) * 3.48) * 8

For a standard 350:
((3.14 * 2^2) * 3.48) * 8 = 349.67

For a .030 over 350
((3.14 * 2.015^2) * 3.48) * 8 = 354.94

For a .040 over 350
((3.14 * 2.02^2) * 3.48) * 8 = 356.70

For a .060 over 350
((3.14 * 2.03^2) * 3.48) * 8 = 360.24
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Old 02-27-2002, 01:49 PM   #5
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thanks guys.
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Old 02-28-2002, 08:14 AM   #6
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Quote:
Originally posted by Mark305TBI
((Pi * (bore/2)^2) * 3.48) * 8

For a standard 350:
((3.14 * 2^2) * 3.48) * 8 = 349.67

For a .030 over 350
((3.14 * 2.015^2) * 3.48) * 8 = 354.94

For a .040 over 350
((3.14 * 2.02^2) * 3.48) * 8 = 356.70

For a .060 over 350
((3.14 * 2.03^2) * 3.48) * 8 = 360.24
Actually, that is very close. If you take the value of out to more decimal places, the numbers start coming up a bit different, but round to about the same. 0.030" overbore will net a 355.1 CID.

If you want a "cheater" spreadsheet, check this link:

Engine Calculator.xls
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Old 02-28-2002, 09:27 AM   #7
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C'mon Vader, quit being so nit picky. It was alot easier to just type 3.14 and our calculated volumes are within 1%. Everybody's going to round up/down to the nearest cubic inch anyway...
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Old 02-28-2002, 10:50 AM   #8
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Vader has it right though. To do it correct you should only round the final value. Rounding values used in the formula then rounding again won't be as accurate.
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Old 02-28-2002, 11:07 AM   #9
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Well, technically, anytime you use Pi in an equation you have to do some rounding. How much rounding depends on the desired accuracy you wish to get from your calculations. Since we only wish to get our calculated values correct to one cubic inch it doesn't really hurt to only use Pi out to two decimal places...unless you just want to be nit picky for the fun of it.
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Old 02-28-2002, 10:04 PM   #10
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I like this one : Bore x Bore x .7854 x Stroke x # of Cyls.
Example: 4.001 x 4.001 x .7854 x 3.48 x 8 = 350.02348
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Old 02-28-2002, 10:04 PM
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