engine suggestions - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Tech Forums > Builders Corner

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-23-2013, 08:11 PM   #1
Newb
 
Robbins's Avatar
 
Join Date: Dec 2012
Location: OK
Posts: 10
engine suggestions

Alright guys here is what ive got going on in my head. Ive got an 84 Cj7 with the 4.2 liter straight six. Im wanting to rebuild the motor, bore it out, upgrade carburator and throw in a cam. Not sure what to bore it out to or what kind cam or carburator to get. I still want to be able to drive it on the road fine but tair up the trails. Ive got 3.5 inches of lift and it sittin on 35'' cooper stts. Any suggestions? Not too experienced on motors so need any and all kinds of advice. Thanks!!

Robbins is offline   Quote Quick Reply
Old 02-23-2013, 08:12 PM   #2
Newb
 
Robbins's Avatar
 
Join Date: Dec 2012
Location: OK
Posts: 10
Click image for larger version

Name:	ForumRunner_20130223_201159.jpg
Views:	116
Size:	136.7 KB
ID:	213607

Robbins is offline   Quote Quick Reply
Old 03-03-2013, 06:52 PM   #3
Jeeper
 
Join Date: Jan 2011
Location: CHAPEL HILL TN
Posts: 54
Why not just pull the 4.2 out and go with a SBC. For not much more than you would spend doing a good rebuild and getting it bored and out and remachined you could put a SBC in it and get more power. Just a thought..
10huey is offline   Quote Quick Reply
Old 04-04-2013, 01:23 PM   #4
Jeeper
 
JoopMan88's Avatar
 
Join Date: Apr 2013
Location: Colorado
Posts: 18
I rebuilt my I6 and a 22re out of a Toyota What did you need help with?

Just an fyi this could cost more than you think. We bored over the 22re .040 (to it's max) and with the new parts i.e. pistons, Piston rings, rebuild kit, gasket set, cost to have the machine shop do the work, ect... It came out to roughly the same price as a crate engine.

If the engine is in working condition than there is no need to bore over stock specs. One of the only reason people over bore is to gain horse power or just to resurface the internals of the motor (to make for a brand new engine). If the engine runs fine then suggest doing a compresion test and if the all 6 pistons are within 10 psi (I prefer 5) of each other that means your all pistons are wearing at the same rate, that's a good thing.
__________________
DON'T LEAVE ME ALONE WITH METAL!
JoopMan88 is offline   Quote Quick Reply
Old 04-04-2013, 01:37 PM   #5
Jeeper
 
JoopMan88's Avatar
 
Join Date: Apr 2013
Location: Colorado
Posts: 18
Here is my I6 and my buddies 22re,




__________________
DON'T LEAVE ME ALONE WITH METAL!
JoopMan88 is offline   Quote Quick Reply
Old 04-04-2013, 01:42 PM   #6
Jeeper
 
JoopMan88's Avatar
 
Join Date: Apr 2013
Location: Colorado
Posts: 18
My I6 I did NOT pull the head, because when you do it is HIGHLY recommended that you bring it to a machine shop to check for warp or wear on the surfaces. This means if there is warp then the pieces need to be machine which can cost a pretty penny. So my advice is pull the heads at you own risk.

So I didn't pull my head when I rebuilt mine, I just placed all the gasket (except the head) cleaned all the parts and painted with high temp paint.

__________________
DON'T LEAVE ME ALONE WITH METAL!
JoopMan88 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler 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:
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.



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 Off
Pingbacks are Off
Refbacks are Off



» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 03:33 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC