4.0 vs 4.0 High Output ??? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-20-2012, 12:04 AM   #1
Jeeper
 
vertical horizons's Avatar
 
Join Date: Apr 2012
Location: Houston, Tx
Posts: 1,727
4.0 vs 4.0 High Output ???

I saw a classified ad for a 1997 Wrangler.
On the side of the vehicle was lettering that said "4.0L High Output".

Is the 4.0L engine always a HIGH OUTPUT engine, or are there two different engines?

vertical horizons is offline   Quote
Old 08-20-2012, 12:07 AM   #2
Jeeper
 
vertical horizons's Avatar
 
Join Date: Apr 2012
Location: Houston, Tx
Posts: 1,727
Sorry.
Herer's a picture.

vertical horizons is offline   Quote
Old 08-20-2012, 12:08 AM   #3
Supporting Member

WF Supporting Member
 
jeepwayoflife's Avatar
 
Join Date: Nov 2011
Location: California/Montana
Posts: 3,192
This should help

Quote:
Originally Posted by UnlimitedLJ04
no. 4.0L HO (high output) was the badging on 91-95 YJ's (and XJ's maybe?) to signify the engine was different from the previous 4.2L (carb'ed) and 4.0L's (non-HO head casting 2686).

The "HO" engines used head casting 7120. Later head castings in all models were 0631 and 0331, and all can be considered "HO" if you like. Jeep just dropped the badging in the later models. There are some differences in bench flow data, but if you look at Jeep's specs, later years with 0331 heads were rated for more power & torque than 7120's.

http://www.jeep4.0performance.4mg.com/tech_specs.html
__________________
--------------------------------------------------------
jeepwayoflife is offline   Quote
Old 08-20-2012, 03:06 AM   #4
Jeeper
 
MarkGLHS's Avatar
 
Join Date: Aug 2012
Location: Ellington, Connecticut
Posts: 1,433
the 4.0L H.O. engine was an option on certain Grand Cherokees up through model year 2004. The true H.O. engine, which had increased HP and torque over the standard EFI 4.0L, was never available in a Wrangler to the best of my knowledge.
__________________
2002 Wrangler Sahara, all stock, 5-speed, Dana 44, dual tan tops, 2nd owner.

2008 Hemi Grand Cherokee Limited 4X4, Quadradrive II, original owner, 24,000 miles.
MarkGLHS is offline   Quote
Old 08-20-2012, 04:08 AM   #5
Jeeper
 
MarkGLHS's Avatar
 
Join Date: Aug 2012
Location: Ellington, Connecticut
Posts: 1,433
^I meant to say 4.7L not 4.0L.
__________________
2002 Wrangler Sahara, all stock, 5-speed, Dana 44, dual tan tops, 2nd owner.

2008 Hemi Grand Cherokee Limited 4X4, Quadradrive II, original owner, 24,000 miles.
MarkGLHS is offline   Quote
Old 08-20-2012, 09:02 AM   #6
Newb
 
Join Date: Aug 2011
Location: Richmond, va
Posts: 2
4.0 ho

The 4.0 H.O. emblem was put on cherokees, grand cherokees and some YJ wranglers for a period of time( early 90's), but the motor is no different.
mcgheejeep is offline   Quote
Old 08-20-2012, 09:03 AM   #7
Newb
 
Join Date: Aug 2011
Location: Richmond, va
Posts: 2
The empblem on that particular Wrangler is a rear, right hand corner emblem that has been put in the wrong spot....And they never came in pink.
mcgheejeep is offline   Quote
Old 08-20-2012, 09:13 AM   #8
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 35,256
Images: 2
Quote:
Originally Posted by MarkGLHS View Post
the 4.0L H.O. engine was an option on certain Grand Cherokees up through model year 2004. The true H.O. engine, which had increased HP and torque over the standard EFI 4.0L, was never available in a Wrangler to the best of my knowledge.
The Wrangler YJ got the "High Output" 4.0L in 1991 which has been used in the Wrangler ever since. That is when the YJ Wrangler lost its old carbureted 4.2L engine and went to the fuel injected 4.0L engine that had been in the XJ Cherokee for a couple years by then. Jeep simply stopped adding the High Output sticker a little later.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote
Old 08-20-2012, 10:08 AM   #9
Jeeper
 
UnlimitedLJ04's Avatar
 
Join Date: Aug 2010
Posts: 8,158
Quote:
Originally Posted by vertical horizons View Post
Sorry.
Herer's a picture.
that's not a factory badge.

somebody bought the pink lettered "Jeep" and "4.0L High Output" emblems on Ebay (or someplace else) and stuck them on the Jeep.

UnlimitedLJ04 is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not 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




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 06:26 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

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