66 Mustang I6 HELP - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

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

LinkBack Thread Tools
  #1 (permalink)  
Old 05-10-2008, 01:41 PM
66Moostang's Avatar
Registered User
Join Date: May 2008
Location: Las Vegas
Posts: 33
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
66 Mustang I6 HELP

I have a 66 Mustang coupe with the Ford 200ci I6.. It is all stock (for now), but i wanted to know the stock compression ratio and rear gear ratio for this car and engine.

Thanks in advance to anyone who can help

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 05-17-2008, 03:17 AM
Join Date: Jun 2004
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hey man hope you're still around to read this reply. Can't help with the CR but regarding the rear diff ratios, if you have a 3 or 4 speed then the ratio is 3.2 to 1. If you have an auto then the std is 2.83 with the option of a 3.2
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-17-2008, 06:58 AM
Last wiki edit: Ford axle ratio codes
Last journal entry: Rear Suspension
Join Date: Aug 2005
Location: Prattsville
Posts: 7,302
Wiki Edits: 31

Thanks: 5
Thanked 206 Times in 184 Posts
9.2:1 factory compression ratio. the rear end is a 71/4" rear end. it all depends on the car with a 6cyl as to what rear gear it has. 3.50's were very common in the 6cyls w/ manuals. but to make sure of what you got look at the axle code on the door tag, mustang door tag decoders are all over the internet however, for finding the axle code, a Falcon decoder will also work
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-18-2008, 12:40 AM
techinspector1's Avatar
Last wiki edit: DynoSim combinations
Join Date: Oct 2005
Location: Zephyrhills, Florida, USA
Age: 78
Posts: 17,371
Wiki Edits: 326

Thanks: 2,064
Thanked 3,012 Times in 2,243 Posts
Here's how I do it for an open-type differential.
Jack up one wheel off the ground and place a sturdy jackstand on the axle tube close to the spring. Make a chalk mark on the tire at the tread and on the ground next to the tire mark. Mark a chalk mark on the driveshaft and rig up a piece of clothes hanger wire nailed to a piece of 2x4 so that the end of the wire points directly at the chalk mark. Have a buddy watch the driveshaft while you turn the tire. Have him stop you when he has counted 10 revolutions of the driveshaft. The number of times you have rotated the tire will be the ring and pinion ratio. If the tire turned about 3 1/2 times, the ratio is 3.50:1. If it turned about 3 1/4 times, it's 3.25:1. 3 turns would be 3.00:1. 2 3/4 turns would be 2.75:1 and so forth. You can interpolate odd turns by thinking about the tire as a clock face. Each 6 minutes would be 1/10th of a ratio point. In other words, if the tire turned 3 full turns and another 12 minutes, it would be a 3.20 ratio.
Reply With Quote Quick reply to this message

Recent Hotrodding Basics posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
66 Mustang front suspension upgrade 66StangBoy Suspension - Brakes - Steering 26 01-02-2007 04:32 AM
66 Mustang front brakes 66-351 Suspension - Brakes - Steering 3 09-18-2006 07:16 PM
'66 Mustang Power Steering Ford GT Suspension - Brakes - Steering 6 08-07-2006 02:12 PM
Power steering for '66 Mustang Ford GT Introduce Yourself 1 07-31-2006 08:31 PM
66 Mustang charging problems. Pulling my hair out... danbeck Electrical 4 12-30-2004 08:08 AM

All times are GMT -6. The time now is 10:51 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.