compression for a 4.2L motor ? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > General Technical Discussions > Engines & Drivetrain > compression for a 4.2L motor ?

Savvy/Currie Aluminum Control ArmsROCK BOTTOM prices on LIFT KITS at Rockridge4wd!! WANT TO December Specials at Jeephut.com

Reply
Unread 10-23-2013, 10:57 AM   #1
krazybob
Registered User
1988 YJ Wrangler 
 
Join Date: May 2013
Location: mountain home, idaho
Posts: 48
compression for a 4.2L motor ?

I checked my compression in my 1988 4.2L engine, and all cylinders are right at 130# Can someone tell me what the optimum pressure should be so I can tell how my engines compression compares ?

__________________
Krazybob,, Mtn. Home, Idaho
My goal, is to die young,,
at a very old age
1988 YJ 4.2 5sp
krazybob is offline   Reply With Quote Quick reply to this message
Unread 10-23-2013, 10:46 PM   #2
uberxj92
Registered User
1992 XJ Cherokee 
 
Join Date: Oct 2012
Location: umatilla, florida
Posts: 1,962
150ish on a fresh motor us good. You have great compression for an 88.
__________________
http://www.jeepforum.com/forum/f177/92-xj-sadness-2075657/index2.html
uberxj92 is offline   Reply With Quote Quick reply to this message
Unread 11-16-2013, 02:17 PM   #3
fastfreddie
Registered User
 
Join Date: Dec 2007
Posts: 568
The important thing with compression checks is, as in your findings, the numbers are the same across the board. That's impressive for an older engine.
A leak down test is prolly what you're looking to do to find out if the engine is tired.
fastfreddie is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.