fattie92

what is a 350 that is bored .040 equal to? 355 or a 358?

zippy

357

rezinn

.03 overbore is approx. 5 cubic inches. .040 is almost 7

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

fattie92

thanks guys.

Vader

Actually, that is very close. If you take the value of pì 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

Mark305TBI

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...

82camaro

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.

Mark305TBI

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.

Nordbert

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