cubic inch formula - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 04-15-2005, 07:16 PM
Registered User
 
Join Date: Jul 2004
Location: Red Deer,Alberta. Canada
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
cubic inch formula

Can someone tell me the formula for determining cubic inch size of an engine? I,m trying to figure out the exact size of my "40" over 327 SBC.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-15-2005, 07:19 PM
tbirdscott's Avatar
stuff'n things'n whatnot
 
Last photo:
Join Date: Oct 2004
Location: P-Dot B.C.
Age: 29
Posts: 356
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Bore X Bore X Stroke X .7854 X # of cylinders = Cubic Inches
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-15-2005, 07:44 PM
strikingthematch's Avatar
Pure American Muscle
 

Last journal entry: Still Going
Last photo:
Join Date: Mar 2004
Location: VA
Posts: 688
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
If your ever in a bind go HERE
327 was the same as a 350 it just useds a 3.25 inch stroke crank instead of the 350's 3.48. So in other words org. bore is 4 inches 4 over gives you 4.040 Then if you look on the page you wil lsee 40 over next to 327 and you will see 333.293... and there ya go

Chris

Last edited by strikingthematch; 04-15-2005 at 09:00 PM.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-15-2005, 08:40 PM
Max Keith's Avatar
Member
 
Last photo:
Join Date: Jul 2003
Location: Fort Madison,Iowa
Age: 66
Posts: 2,391
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Basic Math 101

Formula for finding CID of an engine.

Pi times bore radius squared times stroke times number of cylinders.

Example:

3.1416 X (2 x2 radius of 4 inch bore squared) X 3.50 = 43.98 X 8 = 351.86 Cubic Inches.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-16-2005, 09:25 PM
GoneNova/406's Avatar
Member
 
Join Date: Aug 2003
Location: columbus,ohio
Age: 59
Posts: 1,163
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
example 350 c.i.
4x4x.7854x3.48x8=349.84857
borexborex.7854xstrokexnumber of cylinders=c.i.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-16-2005, 10:06 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The volume of any cylinder is: PIE ARE SQUARE TIMES LENGTH. PIE ARE NOT ROUND IN MATH. PIE IS ROUND AT THE GROCERY STORE.

Of course the length in an automotive engine cylinder is determined by crankshaft stroke.

Who was asleep in 9th grade geometry?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-16-2005, 10:11 PM
Max Keith's Avatar
Member
 
Last photo:
Join Date: Jul 2003
Location: Fort Madison,Iowa
Age: 66
Posts: 2,391
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Geometry?

Gee I was taught the formula for finding the volumn of a cylinder in 6th grade math class, but then that was back in the days when teachers could read and write better than that students.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-16-2005, 10:34 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,486
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
Quote:
Originally Posted by NAIRB
The volume of any cylinder is: PIE ARE SQUARE TIMES LENGTH. PIE ARE NOT ROUND IN MATH. PIE IS ROUND AT THE GROCERY STORE.

Of course the length in an automotive engine cylinder is determined by crankshaft stroke.

Who was asleep in 9th grade geometry?

Good call brian. Not to be a jerk (heck, we've all made some poor calculations in our time) but for crying out loud, finding the volume of a cylinder is pretty basic stuff. After having been through basic high school algebra, we all should be able to do this stuff without needing 10 replies to give directions.

The proper way to do it is Pi(radus squared) mulitplied by stroke (or height of cylinder) and then by the number of bores you have.

K

Last edited by killerformula; 04-17-2005 at 01:12 AM.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 04-16-2005, 10:39 PM
Member
 
Join Date: Nov 2004
Location: rio de janeiro
Posts: 224
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
One more way:

Area of the circle,times height. Paulo
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
305 cubic inch motor question richardson110 Engine 15 02-09-2008 09:53 AM
9 inch question 19nova72 Transmission - Rearend 7 03-12-2005 04:15 PM
mopar 500 cubic inch stroker zebber Engine 1 01-30-2005 11:31 PM
9 inch or 8 inch Cowtown Punk Transmission - Rearend 3 08-13-2004 09:10 PM
Cubic Inch and Cam Question tommytempest Engine 4 08-05-2004 09:39 PM


All times are GMT -6. The time now is 07:36 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.