engine math
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: engine math (Todbo)
Pi x r squared x stroke x number of cylinders
i.e. 427 BB = 4.25" bore, 3.76" stroke
3.142 x ((4.25"/2)squared) x 3.76 = 53.347 cubic inches per cylinder
53.347 x 8 = 426.778 cubic inch engine displacement
Chuck
i.e. 427 BB = 4.25" bore, 3.76" stroke
3.142 x ((4.25"/2)squared) x 3.76 = 53.347 cubic inches per cylinder
53.347 x 8 = 426.778 cubic inch engine displacement
Chuck
Thread Starter
Burning Brakes
Joined: May 2001
Posts: 988
Likes: 1
From: Dyersburg TN
Re: engine math (Chuck Harmon)
Thanks Chuck , so if I want to figure the .040 over 427 I would replace the 4.250 with 4.29 in the formula and that would give me the corrected displacment. :cheers:
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: engine math (Todbo)
Yep, you got it. I hate to bore more than I need to, but increasing the bore (unlike stroking) does increase your horse power. "When in doubt, bore it out!"
Chuck
Chuck
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Re: engine math (Chuck Harmon)
Pi X [rXr] X stroke X no cyl.= CID
bore diameter X bore diameter X.7854 X stroke X no cyl = CID
These are both valid formulae for the volume of a cylinder (engine, w/X no cyls.). I remember the pi X r version from 8th grade geometry. The volume equals the area of the base times the height.
HUH???
RACE ON!!!
1984 Crossfire
Member NHRA
bore diameter X bore diameter X.7854 X stroke X no cyl = CID
These are both valid formulae for the volume of a cylinder (engine, w/X no cyls.). I remember the pi X r version from 8th grade geometry. The volume equals the area of the base times the height.
Yep, you got it. I hate to bore more than I need to, but increasing the bore (unlike stroking) does increase your horse power
Chuck
Chuck
RACE ON!!!
1984 Crossfire
Member NHRA
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