c.i.d 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> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-24-2007, 07:40 PM
Registered User
 
Join Date: Jan 2007
Location: california
Age: 38
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
c.i.d formula

hey every 1 i have a question ?
in the c.i.d. formula what does the 0.7854 stand for
thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-24-2007, 08:18 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,394
Wiki Edits: 0

Thanks: 29
Thanked 469 Times in 426 Posts
c.i.d. formula's

The number 0.7854 is 1/4 of 3.1416 (pi).
The formula I've found to be the simplest to use is: bore x bore x stroke x 6.2832 = cubic inches for a V8. Change 6.2832 to 3.1416 for a 4-banger or to 2.3562 for a 6-cylinder. See the connection? 2 pi ; 1 pi ; 1 and 1/2 pi.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-24-2007, 10:39 PM
FordMan1951's Avatar
Ford Man to the bone!!!
 
Last photo:
Join Date: Dec 2006
Location: Lubbock,TX
Age: 63
Posts: 112
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
pi r squared = area of circle

or

3.1416 * Radius * Radius = area of circle

In math the times and division parts of a formula can be moved around without changing the results.

Because of this:

Move Pi to end and you get

Radius * Radius * pi

or

bore / 2 * bore / 2 * pi

rearange it again to be

bore * bore * pi / 2 / 2

or

bore * bore * pi / 4

or

bore * bore * 0.7854

Got it?
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
displacement formula minesblown Engine 13 01-25-2007 07:28 AM
Gear ratio formula? AC/DC General Rodding Tech 4 10-13-2006 05:40 AM
looking for a metalic red formula TheCiscoKid Body - Exterior 4 02-15-2006 09:00 AM
engine timing: formula onecoomofo Engine 1 04-01-2004 07:35 AM
Formula 500 steering box deltr0n Suspension - Brakes - Steering 2 10-04-2002 01:12 PM


All times are GMT -6. The time now is 10:42 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.