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Offline Crazydawg

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Cubic inch question
« on: July 07, 2006, 03:14:59 PM »
How is cubic inch determined? Example..........Say I have a 350 Chevy its bored out say 60 over.......is my class 350 cubes or is it whatever the engine is after its been bored out?

Thanks for the help
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Offline Sumner

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Re: Cubic inch question
« Reply #1 on: July 07, 2006, 03:26:18 PM »
Quote from: Crazydawg
How is cubic inch determined? Example..........Say I have a 350 Chevy its bored out say 60 over.......is my class 350 cubes or is it whatever the engine is after its been bored out?

Thanks for the help


It is the final size after the rebore, but you should be fine as "C" motors go up thru 372 ci.

The motorcycle guys can re-bore theirs, but I'll let them explain that.

c ya, Sum
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JohnR

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Re: Cubic inch question
« Reply #2 on: July 07, 2006, 03:30:56 PM »
Quote from: Crazydawg
How is cubic inch determined? Example..........Say I have a 350 Chevy its bored out say 60 over.......is my class 350 cubes or is it whatever the engine is after its been bored out?

Thanks for the help


The actual formula used is bore x bore x .7854 x stroke x # of cyls. All dimensions in inches and bore and stroke is "as measured".

Class    Cubic Inch Displacement (Liter Equiv)   
AA = 501.00 cid and over (8.210 L and above)   
A = 440.00 thru 500.99 cid (7.210 thru 8.209 L)
B = 373.00 thru 439.99 cid (6.112 thru 7.209 L)
C = 306.00 thru 372.99 cid (5.015 thru 6.111 L)
D = 261.00 thru 305.99 cid (4.277 thru 5.014 L)
E = 184.00 thru 260.99 cid (3.015 thru 4.276 L)
F = 123.00 thru 183.99 cid (2.016 thru 3.014 L)
G = 93.00 thru 122.99 cid (1.524 thru 2.015 L)
H = 62.00 thru 92.99 cid (1.016 thru 1.523 L)
I = 46.00 thru 61.99 cid (0.754 thru 1.015 L)
J = 31.00 thru 45.99 cid (0.508 thru 0.753 L)
K = up to 30.99 cid (0.507 L and under)
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Offline Seldom Seen Slim

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Cubic inch question
« Reply #3 on: July 07, 2006, 03:56:53 PM »
No, Sum -- please don't get everyone started on motorcycle ovebores again!  Anything -- talk about religion, or tell a mother her baby is ugly, or be rude to the inspectors -- anything but bike bore discussions.

I'd go on but I'm busy working on the race trailer.
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Offline PorkPie

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Cubic inch question
« Reply #4 on: July 07, 2006, 05:02:47 PM »
No, Sum -- please don't get everyone started on motorcycle ovebores again!

Jon, how much ovebores you are :D
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Pork Pie

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Offline Freud

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« Reply #5 on: July 07, 2006, 05:12:42 PM »
Jon isn't overbored.

He's only been reamed out.

Too large to measure so he is UNLIMITED CLASS.

FREUD
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Offline JackD

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ALL THIS
« Reply #6 on: July 07, 2006, 07:03:53 PM »
coming from a DR ?
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Offline Bob Drury

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Cubic inch question
« Reply #7 on: July 07, 2006, 10:05:15 PM »
Rumor has it that the good Doctor was last seen packing luggage after practicing his "theories" on a young assistant.  I believe they were something about linear coefficients of cylindrical objects when friction is applied.....................................
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Bob Drury

Offline Bob Drury

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Cubic inch question
« Reply #8 on: July 07, 2006, 11:14:35 PM »
Oh, wait, that was Dr. Freudenstein, not Dr. Freudenberger....oh, well............
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Bob Drury

Randy Williams

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Re: Cubic inch question
« Reply #9 on: July 09, 2006, 01:50:13 AM »
Quote from: Crazydawg
How is cubic inch determined? Example..........Say I have a 350 Chevy its bored out say 60 over.......is my class 350 cubes or is it whatever the engine is after its been bored out?

Thanks for the help



 bore X bore X stroke X #of cylinders X .7854 = CID

 4.060 X 4.060 X 3.48 X 8 X .7854 = 360.42274

  When you get to filling out your tech card tell them it's
  has 361 Cubic Inches of Displacement.
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Offline JackD

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THE BIKE RULE RULERS CRAWLING FROM UNDER A BOARD
« Reply #10 on: July 09, 2006, 05:42:38 AM »
The Bike Rule Rulers should be nailed to a board or slapped with one or what ?
I know they slide a lot of stuff under one and live under them.
When you shine a light on them, they scatter.
They must be "Ugly Babies" as Slim suggested.
 Is that it ?
I don't get it ! :wink:
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"I would rather lose going fast enough to win than win going slow enough to lose."
"That horrible smell is dirty feet being held to the fire"

JohnR

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Re: THE BIKE RULE RULERS CRAWLING FROM UNDER A BOARD
« Reply #11 on: July 09, 2006, 11:11:10 AM »
Quote from: JackD
The Bike Rule Rulers should be nailed to a board or slapped with one or what ?
I know they slide a lot of stuff under one and live under them.
When you shine a light on them, they scatter.
They must be "Ugly Babies" as Slim suggested.
 Is that it ?
I don't get it ! :wink:


Hey Jack,

Can you at least attempt to make your constant SCTA bashing appear to be related to the thread you are posting it in?
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Offline JackD

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OVERBORE
« Reply #12 on: July 09, 2006, 12:00:50 PM »
John must be one of those "OVERBORE" supporters. LOL
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Offline jimmy six

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Cubic inch question
« Reply #13 on: July 10, 2006, 01:02:05 PM »
You can tell us anything you want but on the for we would like the bore and stroke if known....If you make it to impunds your cubic inches will be varified. Removal of a head and direct measurment, removal of 2 push rods and a calibrated air pump (same as nascar) or if you have a dual overhead cam or center spark plug we have the equipment to measure it. Good luck J. D.
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Offline JackD

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FORGOT ?
« Reply #14 on: July 10, 2006, 06:42:01 PM »
JD
You forgot fluid displacement. :wink:
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"That horrible smell is dirty feet being held to the fire"
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