Make sure I do this right - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 01-05-2013, 01:26 PM   #1
Jeeper
 
khende's Avatar
 
Join Date: Feb 2012
Location: San Marcos, CA
Posts: 185
Make sure I do this right

The motor in gone in my 89 YJ and I want to upgrade.

I will be ordering:
4.2 Performace long block with H.O 4.0 head and 248 cam from Hiperformer
Mopar MPI fuel injection kit from Hesco
Dampner for MPI from Hesco
JBA stainless steel header for 4.0 head from Jegs

The questions I have are

Will the manifold from the MPI kit fit the 4.0 head?

Will there be any clearance problems with headers?

Do I need to upgrade the distributer and coil?

Is there anything I am missing?

__________________
The democracy will cease to exist when you take away from those who are willing to work and give to those who would not
khende is offline   Quote
Old 01-05-2013, 03:14 PM   #2
Jeeper
 
stykthyn's Avatar
 
Join Date: Mar 2011
Location: gainesville florida
Posts: 1,226
that seems like a lot of coin to throw at a 4.2.

__________________
1995 YJ- daily driver
1987 Mustang- the money pit. " I wanna go fast!"
stykthyn is offline   Quote
Old 01-05-2013, 03:40 PM   #3
Jeeper
 
khende's Avatar
 
Join Date: Feb 2012
Location: San Marcos, CA
Posts: 185
Quote:
Originally Posted by stykthyn View Post
that seems like a lot of coin to throw at a 4.2.
My budget is 6k including the labor to install the motor. I do not want a used engine and inherit someone elses problems. My prioirty is the MPI fuel
injection. My current motor has a cracked head and many miles on the first rebuild, the bottom end is rattling so it needs to be replaced. I looked at the 4.6 stroker and could not get a long block to fit within the budget. The long block I am getting has a 100k warrnety and the company has a good track record. Also to me a 4.2 belongs in an 89
__________________
The democracy will cease to exist when you take away from those who are willing to work and give to those who would not
khende is offline   Quote
Old 01-06-2013, 03:38 PM   #4
Jeeper
 
0III0forlife's Avatar
 
Join Date: Mar 2012
Location: Ridgway, Pa.
Posts: 3,941
You might want to check into a Howell fuel injection kit, instead of the Hesco. The Howell kit comes complete with everything you need to make a 4.2 fuel injected.

As far as the header, there will be tons of clearance problems, with the front driveshaft, not to mention that you will have to make a custom exhaust from the collector back.

I made the ignition upgrade when i put the new long block 4.2L in my 87, HEI distributor with an Accel super coil. It isnt really needed, the stock stuff works just fine, I did it cause i wanted to.

The things that you are missing are fuel delivery to the MPI system. It is the only thing that is keeping me from putting a howell system on mine. The stock pump(on the motor) wont work (wrong p.s.i.), and you cant switch over the sending unit in your tank to a fuel pump unit cause the hole is a different size. So, you either have to put an electric pump somewhere on the frame(which isnt cool, cause it would be subjected to the abuse of off roading) or...replace the tank with a newer model that will hold a pump/sending unit in it.
0III0forlife is offline   Quote
Old 01-06-2013, 06:25 PM   #5
Jeeper
 
roadyrob's Avatar
 
Join Date: Apr 2012
Location: west palm fla
Posts: 1,142
the mopar kit comes with the distributor. I'd ask hesco if the kit fits the 4.0 head and about the header. they are about #1 for jeep engines. don't worry about building a 4.2 with the parts your using it will walk away from a stock 4.0.
roadyrob is online now   Quote
Old 01-06-2013, 06:51 PM   #6
Jeeper
 
khende's Avatar
 
Join Date: Feb 2012
Location: San Marcos, CA
Posts: 185
My intent is to build somthing somewhat unique and reliable that I can attach a smail trailer to and get deep into the Sierras or Rockies camp, and fish for wild trout. I am 64 and I can no longer walk to these places. I also want to do Moab and the Rubicon and not leave leaking oil on the trail. And most importanly I want the darn thing to start in the morning. i am sick of the #%$#@##%$ carb. I have looked at both the Howel fuel injection and the Mopar MPI even though I can save a lot of money I think the MPI will lead to less issues.

Thanks for the advice I will look into the fuel pump issue. I cannot see mounting to the frame.
__________________
The democracy will cease to exist when you take away from those who are willing to work and give to those who would not
khende is offline   Quote
Old 01-30-2013, 04:29 PM   #7
Newb
 
Join Date: Jan 2013
Posts: 2
HESCO designed the MOPAR kit for jeep.
bamabrock is offline   Quote
Old 01-30-2013, 05:34 PM   #8
Jeeper
 
khende's Avatar
 
Join Date: Feb 2012
Location: San Marcos, CA
Posts: 185
Yep and one is being delivered Monday, by the way I am told by my supplier that Hesco wants to raise the price on this kit by 700 bucks. putting the cost well over 3k. At that price I would be buying the Howell. That would be a pretty steep price for Jeep that is almost 15 years old.

__________________
The democracy will cease to exist when you take away from those who are willing to work and give to those who would not
khende 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 12:19 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