Difference 4.0 vs 4.0 HO - 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 > Difference 4.0 vs 4.0 HO

Rough Country Jeep Suspension Deals at Rockridge 4WD!Engo winches available at www.rockridge4wd.com! Free shippRockridge 4WD IS Taking Zone Offroad Suspension Lift Kits

Reply
Unread 06-26-2002, 10:25 AM   #1
RDJOHN
Registered User
 
Join Date: Mar 2002
Posts: 1
Difference 4.0 vs 4.0 HO

What are the differences between the HO and regular 4.0??

I have a '95 grand cherokee with the reg. 4.0 and would like some more HP.

What is the factory window sticker milage for the 4.0 and 4.0 HO.??

RDJOHN is offline   Reply With Quote
Unread 06-26-2002, 06:19 PM   #2
compfreak2002
Registered User
 
Join Date: May 2002
Posts: 63
I belive the diff between the two, is that the 4.0 HO has about 40 more HP and it has a better air induction and the timing is advanced.
__________________
89 XJ Limited
High Performance Intake w/ K&N Filter
Pioneer 6400 Headunit
2 10" Subs
500watt running subs, 400watt running highs, .5 Farad Cap
Neon Accenting
Mettalic Blue Paint
Clear Front corner markers
Blue Euro Headlights

Beep Beep whos got the keys to the Jeep
compfreak2002 is offline   Reply With Quote
Unread 06-27-2002, 09:12 AM   #3
4wheeler4CJ
Registered User
 
Join Date: Mar 2002
Location: Southern Rhode Island
Posts: 1,527
</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by compfreak2002:
<strong>I belive the diff between the two, is that the 4.0 HO has about 40 more HP and it has a better air induction and the timing is advanced.</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">NO, it is not 40 HP.....

4.0 = 177HP
4.0HO = 190HP

13HP difference, on average. The HO's vary from 190HP sometimes by only 2 or 3 HP either way depending on the year/model vehicle, but most are 190HP.
4wheeler4CJ is offline   Reply With Quote
Unread 06-27-2002, 01:31 PM   #4
Eryl Flynn
Registered User
 
Join Date: May 2002
Location: Colorado
Posts: 117
But what is the techincal difference? Computer controlled, a part or 2, or some thing else?
Eryl Flynn is offline   Reply With Quote
Unread 06-28-2002, 12:14 PM   #5
4wheeler4CJ
Registered User
 
Join Date: Mar 2002
Location: Southern Rhode Island
Posts: 1,527
I believe it is due due intake/exhaust/etc., or some combination. Physically/mechanically, they are the same engine.
4wheeler4CJ is offline   Reply With Quote
Unread 07-05-2002, 11:50 AM   #6
B2hi
Registered User
 
Join Date: Sep 2001
Location: Delaware
Posts: 27
The only differences are the Intake and Exhaust efficientcies. Other than that they are identical.
__________________
87 Wrangler 4.2
Mopar MPI
4.0 Head
Throttle body spacer
K+N air filter

Con-ferr shackles,R.E. 4.5 lift with 33x12.5 BFG Muds and 1in. body
B2hi is offline   Reply With Quote
Unread 07-05-2002, 02:19 PM   #7
Eryl Flynn
Registered User
 
Join Date: May 2002
Location: Colorado
Posts: 117
Ahhh, where can I read up on it? I have the 4.0HO and was thinking that some aftermarket parts I won't get as much gains from. So I wanted to have more info to base my decisions on.
Eryl Flynn is offline   Reply With Quote
Unread 07-09-2002, 03:12 PM   #8
NaeKid
JF Administrator, eh?
 
NaeKid's Avatar
1988 YJ Wrangler 
 
Join Date: Nov 2000
Location: Calgary, AB
Posts: 6,880
My understanding is that the 4.0 puts out its horsepower and torque maximum between 2100 and 3000 rpm. The 4.0HO puts out its horsepower and torque maximum at 4000 - 5000 rpm.
__________________
Hello, my name is Vance and I am a Jeepaholic.
Its better to be naked with your friends, than to be clothed with your enemies
  • From street to trail, '88 YJ on 38" tires does it all well
  • Silver 2006 TJ Unlimited, zombie ready as the daily-driver
  • a Kawasaki KLR650 DualSport bike

- - - - - - -TEOTWAWKI- - - - - - -


NaeKid is offline   Reply With Quote
Unread 07-12-2002, 12:07 PM   #9
jeepcherokeev6
Registered User
 
Join Date: Mar 2002
Posts: 126
i posted a similar 4.0 question...

apparently, the JGC has the 4.0HO, but its just not marked in any way as being an HO. but its already an HO engine. as far as i know, the engine you have puts out about 195 HP, but im not sure.

other than that, i dont know the differences between regular and HO.
__________________
Dan, San Bernardino, California

'86 XJ, 2.8 V6 5 spd, 3" lift

"It may be a piece of sh**, but its MY piece of sh**!" -Me
jeepcherokeev6 is offline   Reply With Quote
Unread 07-26-2002, 04:45 PM   #10
whyjay91
Registered User
 
Join Date: Jul 2002
Posts: 4
Difference between high-output and standard 4.0 was mainly slightly better flow with the exhaust manifold and the fact that Chrylser had an aftermarket company design and develop the fuel injection for the HO. 4.0L is as stock as can be. Depending on the year, HO's could have 190-196 hp. Non-HO's were in the mid to upper 170's.
__________________
Black 91 YJ 4LHO Borla|5" Suspension|33BFGMT
Black 2K QC 4x4 4.7 3.92 KVT910DVD
whyjay91 is offline   Reply With Quote
Unread 08-02-2002, 09:36 AM   #11
artsound
Senior Member
 
Join Date: Jun 2002
Location: Miami
Posts: 574
Quote:
Originally posted by compfreak2002
I belive the diff between the two, is that the 4.0 HO has about 40 more HP and it has a better air induction and the timing is advanced.
Does this mean tyhat the HO is less likely to benifit from these intake kits that everyone says gives better mileage?
artsound is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





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.