Engine swap advice..... PLEASE! - 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 06-19-2013, 11:43 AM   #1
Jeeper
 
Join Date: Sep 2012
Posts: 142
superdiver is on a distinguished road
Engine swap advice..... PLEASE!

Well, i am pretty sure my 89 YJ with a 4.2 engine is now toast... I believe it threw a rod, but cant get it to the mechanics yet to verify.

Either way, lets assume the engine is either toast or needs a major overhaul....

If I wanted to swap it out and put in a different engine (one with less then 190k on it like the one i have now) what engine is easiest to swap it out with, best to swap it out with most economical ect ect ect...

Which engine would you replace it with and why? Cost not being the MAJOR factor but a consideration...

I dont race, I dont do serious off road, and I would like it to be reasonably good mileage wise...
superdiver is offline   Quote
Old 06-19-2013, 12:03 PM   #2
Jeeper
 
87YJnTX's Avatar
 
Join Date: Dec 2010
Location: texas
Posts: 250
87YJnTX is on a distinguished road
sounds like go with a rebuild. Adapters will have to be purchased for most if not all other motors. It can get quite exspensive.

other considerations is what kind of driving you are doing, alot of highway ? long run times may be best to go diesel. Diesel is not to good for alot of in town/ short runs though. Tire size ? how much lift ? plan on going higher ?

87YJnTX is offline   Quote
Old 06-19-2013, 12:16 PM   #3
Jeeper
 
BCDonny's Avatar
 
Join Date: Jul 2012
Location: Squamish BC Canada
Posts: 811
BCDonny is on a distinguished road
I would just replace or rebuild the 4.2 and use a good carb (motorcraft 2150) and a HEI dizzy, you will be more than happy with it.
BCDonny is offline   Quote
Old 06-19-2013, 12:44 PM   #4
Jeeper
 
Join Date: Sep 2012
Posts: 142
superdiver is on a distinguished road
I drive mostly in town and short mileage. My off road is at most decent logging roads. I dont have "big" tires yet, and at most I would want to use 33 that are wide. It is NOT lifted but has good springs.

another consideration is that the frame does have rust as I live on the ocean in a rain forest. At what point is it a scrapper?
superdiver is offline   Quote
Old 06-19-2013, 02:25 PM   #5
Jeeper
 
NFGZ's Avatar
 
Join Date: May 2013
Location: St. Augustine, FL
Posts: 729
NFGZ is on a distinguished road
Good gas mileage? Do the mercedes turbo diesel swap. Its dirt cheap pretty much bolt in, and people swear they get 28 mpg with it.
NFGZ is offline   Quote
Old 06-19-2013, 05:58 PM   #6
Jeeper
 
87YJnTX's Avatar
 
Join Date: Dec 2010
Location: texas
Posts: 250
87YJnTX is on a distinguished road
where to get the adapters etc for the mercedes ? probly be more power than the VW diesel
87YJnTX is offline   Quote
Old 06-19-2013, 06:19 PM   #7
Jeeper
 
petercass88's Avatar
 
Join Date: Apr 2013
Location: Melbourne, FL
Posts: 534
petercass88 is on a distinguished road
Would a benz turbo diesel give you plenty of torque to spin 35" tires with 4.88 gears in the diffs? My dad has a VW TDi and it is a sweet motor, when my 4 banger dies I would love to do a turbo diesel swap!
petercass88 is offline   Quote
Old 06-19-2013, 09:34 PM   #8
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,931
OverkillYJ is on a distinguished road
Benz or 4BT are ideal, but they cost a whole lot of money before you are done. I would expect 3000-4000 too do one of those. More if you get a low mileage engine.
__________________
Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
OverkillYJ is offline   Quote
Old 06-19-2013, 10:09 PM   #9
Jeeper
 
Join Date: May 2013
Location: Tyler, TX
Posts: 273
Cashcrazy is on a distinguished road
Cost not a factor I personally would do a GM 4.3 swap with fuel injection. But if cost and ease was considered I would rebuild the 4.2, add a 4.0 head, motorcraft 2100, and TFI ignition.
__________________
1989 YJ, 4.2/TF999
Cashcrazy is offline   Quote
Old 06-19-2013, 10:19 PM   #10
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,931
OverkillYJ is on a distinguished road
Quote:
Originally Posted by Cashcrazy View Post
Cost not a factor I personally would do a GM 4.3 swap with fuel injection. But if cost and ease was considered I would rebuild the 4.2, add a 4.0 head, motorcraft 2100, and TFI ignition.
Jeeps are all about torque. Diesel wins. Strait motors win unless you are putting in a V8.
__________________
Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
OverkillYJ is offline   Quote
Old 06-19-2013, 10:38 PM   #11
Commercial MemberX

5-Year WF Supporting Member
 
Ibuildembig's Avatar
 
Join Date: Aug 2010
Location: Fruitland, Missouri
Posts: 8,636
Ibuildembig is on a distinguished road
X2
Ibuildembig is offline   Quote
Old 06-20-2013, 01:23 AM   #12
Jeeper
 
c5wagner's Avatar
 
Join Date: Apr 2013
Location: Highland, California
Posts: 1,771
c5wagner is on a distinguished road
I did a 5.3l l59 chevy swap about 2 years ago, but had to put my 4.2l back in for california smog nazis to be happy. I got everything to do it for just under $2000, so as you can imagine I was mad when I heard the phrase: your engine is not an available option for your vehicle make....
__________________
Build Thread 1989 YJ, (Soon to come: TBI 350, 4l60) np231 sye/wide chain/6 pinion planetary, D30 ARB & Ford 8.8 ARB 4.56, 31" rollers for now, bds 3.5" springs, 1" Boom Shackles.
c5wagner is offline   Quote
Old 06-20-2013, 09:00 AM   #13
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,931
OverkillYJ is on a distinguished road
What is the rule of thumb with that? Do emissions go on the engines that were supposed to be available for your vehicle in all states? If you put in a diesel or a V8 how does that work? I am in PA, not the worst state, but we do have emission testing here.
__________________
Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
OverkillYJ is offline   Quote
Old 06-20-2013, 07:57 PM   #14
Jeeper
 
c5wagner's Avatar
 
Join Date: Apr 2013
Location: Highland, California
Posts: 1,771
c5wagner is on a distinguished road
I failed because of the visual inspection aspect of california smog. I went to the smog referee, and he told me that I couldn't have a chevy engine in a jeep because that chevy engine was not an "available factory option for my vehicle make." I don't know the exact rules for your state so try calling a smog referee for your county and learn the rules. As for the swap, it is very easy so don't feel overwhelmed. The chevy engine really is self sufficient and not difficult to adapt. You may need after market gauges, an inline fuel pump with the correct psi for whatever engine you choose, and all the other little basics.
__________________
Build Thread 1989 YJ, (Soon to come: TBI 350, 4l60) np231 sye/wide chain/6 pinion planetary, D30 ARB & Ford 8.8 ARB 4.56, 31" rollers for now, bds 3.5" springs, 1" Boom Shackles.
c5wagner is offline   Quote
Old 06-20-2013, 08:23 PM   #15
Jeeper
 
c5wagner's Avatar
 
Join Date: Apr 2013
Location: Highland, California
Posts: 1,771
c5wagner is on a distinguished road
Oh and after doing a few yj engine swaps (on my friends jeeps registered in arizona), I have found the chevy 350 TBI to be the most easily accomplished swap
__________________
Build Thread 1989 YJ, (Soon to come: TBI 350, 4l60) np231 sye/wide chain/6 pinion planetary, D30 ARB & Ford 8.8 ARB 4.56, 31" rollers for now, bds 3.5" springs, 1" Boom Shackles.
c5wagner is offline   Quote
Old 06-20-2013, 08:31 PM   #16
Commercial MemberX

5-Year WF Supporting Member
 
Ibuildembig's Avatar
 
Join Date: Aug 2010
Location: Fruitland, Missouri
Posts: 8,636
Ibuildembig is on a distinguished road
It all depends who you are and what you know the most about. To me, a ford or dodge is just as easy.
Ibuildembig is offline   Quote
Old 06-20-2013, 09:25 PM   #17
Jeeper
 
AZ WRANGLER's Avatar
 
Join Date: Apr 2010
Location: Phx, AZ
Posts: 305
AZ WRANGLER is on a distinguished road
I did a Chevy 5.3 about a year ago and love it! Get ready to spend some money! My jeep had the weak 2.5 in it. If it would have had the 4.2 in it I would have kept it that way. That is a good motor. You should get a rebuilt 4.2 with the stroker kit. Probably the most bang for your buck and easiest swap.
AZ WRANGLER is offline   Quote
Old 06-20-2013, 09:44 PM   #18
BDK
Jeeper
 
BDK's Avatar
 
Join Date: Nov 2010
Location: Cedar
Posts: 553
BDK is on a distinguished road
Get a 4.0 head and manifold some borla headers and a computer and harness out of XJ and switch your 4.2 to FI.

Now if your frame is rusty (holes not surface) you might just want to look at a newer Jeep
__________________
For you Vets and Active Jeepers
MilitaryJeepers.com
BDK is offline   Quote
Old 06-22-2013, 06:50 PM   #19
Jeeper
 
c5wagner's Avatar
 
Join Date: Apr 2013
Location: Highland, California
Posts: 1,771
c5wagner is on a distinguished road
Quote:
Originally Posted by BDK View Post
Get a 4.0 head and manifold some borla headers and a computer and harness out of XJ and switch your 4.2 to FI.
Is this all you have to do to make a 4.2 FI? Because I have a pulled 4.0 from a 93 cherokee that has a cracked block, but the head, manifold, computer, and harness are all good. I can also get a good inline fuel pump.
__________________
Build Thread 1989 YJ, (Soon to come: TBI 350, 4l60) np231 sye/wide chain/6 pinion planetary, D30 ARB & Ford 8.8 ARB 4.56, 31" rollers for now, bds 3.5" springs, 1" Boom Shackles.
c5wagner is offline   Quote
Old 06-26-2013, 11:40 AM   #20
Jeeper
 
Join Date: Sep 2012
Posts: 142
superdiver is on a distinguished road
took the jeep to my mechanic yesterday. He is going to put together some numbers for three different options... a 4.2 replace, a V6 Chev and a straight 5 cylinder Mercedes diesel.

We figure the 4.2 will be the cheapest and easiest, but we want to see how much cheaper...
superdiver is offline   Quote
Old 06-26-2013, 03:47 PM   #21
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,931
OverkillYJ is on a distinguished road
Quote:
Originally Posted by superdiver View Post
took the jeep to my mechanic yesterday. He is going to put together some numbers for three different options... a 4.2 replace, a V6 Chev and a straight 5 cylinder Mercedes diesel.

We figure the 4.2 will be the cheapest and easiest, but we want to see how much cheaper...
That sounds awesome man. I am more curious about the diesel than anything. I have accepted that converting to a diesel would cost me so much more than swapping in a 302 that I have scrubbed the idea and hope to start on my V8 within the next 6 months.

I cant find a 4BT in good shape at a decent price, and it seems the Mercedes route costs quite a bit more than anything gas. The 4BT quote I got just for the hell of it started at 10k, even though I would do it myself I wanted to see what they were going to charge me for.
__________________
Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
OverkillYJ is offline   Quote
Old 06-26-2013, 05:09 PM   #22
Jeeper
 
WGHyrum's Avatar
 
Join Date: Mar 2013
Location: Colorado
Posts: 202
WGHyrum is on a distinguished road
For the diesel, you can get a simple bellhousing adapter and motor mounts made. If you're now up for that, check out
http://www.mercedesdiesel4x4.com/Default.asp
__________________
[]|||||||[]
Putting on a coat is better than putting on my soft top.
WGHyrum is offline   Quote
Old 06-26-2013, 05:55 PM   #23
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,931
OverkillYJ is on a distinguished road
Quote:
Originally Posted by WGHyrum View Post
For the diesel, you can get a simple bellhousing adapter and motor mounts made. If you're now up for that, check out
Mercedes Diesel 4x4.com OM617 Jeep Conversion Kits
Yeah I already looked at all that site. I can get a 302 under 100k miles for $500. Too big a price difference.
__________________
Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
OverkillYJ is offline   Quote
Old 06-27-2013, 07:05 AM   #24
Jeeper
 
WGHyrum's Avatar
 
Join Date: Mar 2013
Location: Colorado
Posts: 202
WGHyrum is on a distinguished road
Okay. It's worth it for me for the torque and ability to run WVO. A bit more money on an engine and a friendship with a restaurant owner can equal free fuel? I'm in.
Also since the average cared for OM617 gets upwards of 600k miles on it, with some reaching the 1 million mark without being rebuilt? Worth the money to me.
__________________
[]|||||||[]
Putting on a coat is better than putting on my soft top.
WGHyrum is offline   Quote
Old 06-27-2013, 08:16 AM   #25
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,931
OverkillYJ is on a distinguished road
Quote:
Originally Posted by WGHyrum View Post
Okay. It's worth it for me for the torque and ability to run WVO. A bit more money on an engine and a friendship with a restaurant owner can equal free fuel? I'm in.
Also since the average cared for OM617 gets upwards of 600k miles on it, with some reaching the 1 million mark without being rebuilt? Worth the money to me.
Yeah well a 302 has about 300 lbs of torque stock. I have a ton of aftermarket options easily available if I decide to I build it, and if I kill it they are cheap and plentiful. Once I put in the first it is a direct swap to replace. Unless you really abuse them though you easily get 250k out of them, which is 10-15 years for me if I get one at 100k.

As far as WVO, I hate French fries and don't think I would be able to stand it or the extra work, so I would be running diesel only.
__________________
Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
OverkillYJ is offline   Quote
Old 06-27-2013, 09:21 AM   #26
Jeeper
 
WGHyrum's Avatar
 
Join Date: Mar 2013
Location: Colorado
Posts: 202
WGHyrum is on a distinguished road
Quote:
Originally Posted by OverkillYJ View Post

Yeah well a 302 has about 300 lbs of torque stock. I have a ton of aftermarket options easily available if I decide to I build it, and if I kill it they are cheap and plentiful. Once I put in the first it is a direct swap to replace. Unless you really abuse them though you easily get 250k out of them, which is 10-15 years for me if I get one at 100k.

As far as WVO, I hate French fries and don't think I would be able to stand it or the extra work, so I would be running diesel only.
Cool. I understand that. I guess I just love diesels. In college I had an 82 rabbit convertible running on WVO (from a chinese place, smelled like spring rolls). Loved the thing.

I respect your decision. Totally do-able and probably cheaper. I'm excited to see the build.
__________________
[]|||||||[]
Putting on a coat is better than putting on my soft top.
WGHyrum is offline   Quote
Old 07-16-2013, 07:28 AM   #27
Jeeper
 
Tacshrp's Avatar
 
Join Date: Jul 2012
Posts: 41
Tacshrp is on a distinguished road
Quote:
Originally Posted by OverkillYJ View Post

Yeah well a 302 has about 300 lbs of torque stock. I have a ton of aftermarket options easily available if I decide to I build it, and if I kill it they are cheap and plentiful. Once I put in the first it is a direct swap to replace. Unless you really abuse them though you easily get 250k out of them, which is 10-15 years for me if I get one at 100k.

As far as WVO, I hate French fries and don't think I would be able to stand it or the extra work, so I would be running diesel only.
Overkill! My only question is:
HOW CAN ANYONE HATE FRENCH FRIES???!!!
Lol
Tacshrp is offline   Quote
Old 07-16-2013, 10:22 AM   #28
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,931
OverkillYJ is on a distinguished road
Quote:
Originally Posted by Tacshrp View Post

Overkill! My only question is:
HOW CAN ANYONE HATE FRENCH FRIES???!!!
Lol
They smell like McDonald's. I hate that place too. Love me a good cheesesteak though.

__________________
Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
OverkillYJ 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 09:08 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 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
« Back

Enter your email address:

Delivered by FeedBurner