compression on a stock 302 1968 mustang? - Ford Mustang Forum
 
LinkBack Thread Tools
post #1 of 6 (permalink) Old 12-10-2009 Thread Starter
Made Member
 
GT500916's Avatar
 
Joined: Oct 2008
Location: dcba
Posts: 519
 
compression on a stock 302 1968 mustang?

anyone know what the stock cylinder compression be on a 68 mustang 302 engine... im assuming most 302s are the same as far as compression goes? does 95lbs sound about right for a rebuilt stock?
GT500916 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 12-10-2009
PONY Member
Classic Member
 
zr2_wolverine's Avatar
 
Joined: Jan 2008
Location: Halifax
Posts: 275
 
Hi! how did you check it, warm the engine and let it cool off 15- 20 mins, remove all the plug and disable your coil and take reading with throttle full open. you should be between 130-170 psi and within 15 psi on all cylinders.
zr2_wolverine is offline  
post #3 of 6 (permalink) Old 12-10-2009
PONY Member
Mustang II Member
 
1978CobraII's Avatar
 
Joined: Apr 2008
Location: Spencerport
Posts: 730
 
Send a message via AIM to 1978CobraII
*scratches head* Your title is misleading. I didn't know if you meant compression ratio of the entire engine or each cylinder.

Oh though I walk through the valley of the rice, I fear no turbo, for torque art with me.

1978 Mustang Cobra II:2.3 Auto Black with Red and Orange Graphics
1976 Mustang Cobra II:302 4 Speed, Knocks like a Champ. Black with Gold Stripes. '70 302 in the works.
1978CobraII is offline  
post #4 of 6 (permalink) Old 12-10-2009
SHELBY GT 350 Member
Classic Member
 
Ivy66GT's Avatar
 
Joined: Dec 2008
Location: Albuquerque
Posts: 6,238
 
The compression ratio of a '68 302 could be anywhere form 8.7 to 10.0:1 depending upon what version you have. But if you are doing the compression test correctly as described above, a reading in Sacramento of 95 psi for any of them means something is wrong and the engine needs work. If someone claims it has been re-built - don't walk, run.

As you go up in elevation the compression psi would be lower. But for 95 to be an OK number you would need to be sitting at an elevation of around 10,000 feet above sea level.
Ivy66GT is online now  
post #5 of 6 (permalink) Old 12-10-2009 Thread Starter
Made Member
 
GT500916's Avatar
 
Joined: Oct 2008
Location: dcba
Posts: 519
 
Quote:
Originally Posted by Ivy66GT View Post
The compression ratio of a '68 302 could be anywhere form 8.7 to 10.0:1 depending upon what version you have. But if you are doing the compression test correctly as described above, a reading in Sacramento of 95 psi for any of them means something is wrong and the engine needs work. If someone claims it has been re-built - don't walk, run.

As you go up in elevation the compression psi would be lower. But for 95 to be an OK number you would need to be sitting at an elevation of around 10,000 feet above sea level.
supposedly its a 68 mustang with stock 302 motor with new seals and gaskets
GT500916 is offline  
post #6 of 6 (permalink) Old 12-11-2009
SHELBY GT 350 Member
Classic Member
 
Ivy66GT's Avatar
 
Joined: Dec 2008
Location: Albuquerque
Posts: 6,238
 
That might be accurate but it takes rings, pistons and valves to correctly rebuild an engine. If you only replace the seals and gaskets the engine will run just as poorly, it just won't leak oil.
Ivy66GT is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user 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, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:
OR

Log-in









Random Question

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 Off
Pingbacks are Off
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183