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Old 07-29-2012, 12:09 PM
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easiest wrangler swap?!

I'm rocking the 2.5L right now and it's been swapped into it from an older jeep (late 80's-early 90's cherokee 2.5) and this thing just doesn't have enough ass to drive the highways where i live. Too many steep grades to even hit the minimum highway speed 55mph in some sections of the highway. Instead of ripping the 2.5L out and trying to build it...I'm thinking about just doing a swap.

Which one is the least labor intensive and easiest on the pocket?

I don't to have to go too crazy with this...

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Old 07-29-2012, 12:56 PM   #2
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Depends on where you source your parts from.

Why don't you do some power modifications to the engine? The MPFI 2.5L engines have a list of parts that can boost the HP figures as much as 40hp..

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Old 07-29-2012, 01:40 PM   #3
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You didnt give us much info to work with...The older cherokees had throttle body injection TBI...and the newer ones were multi port fuel injection MPFI.

If the motor isnt old and tired, switching to MPFI will make a difference like night and day. And a fairly cheap swap if you can find a donor vehicle.

What size tires?, what gear ratio?, trans? all of these make a major difference in giving you the best advice.

If you just want a rough idea of a ball park figure to make a swap from 4cyl to 6cyl, you are looking at somewhere in the neighborhood of 2000-2500 if you do all of the work yourself, if you dont or cant, the price goes up from there.
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Old 07-29-2012, 02:06 PM   #4
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Any way you look at it, the cheapest way to do ANY engine swap, you first have to decide what powertrain you want in your Jeep, then stick with that. no matter what.

Then you have to make sure your driveline can handle that power. If you are still running the DANA 35, your best bet there is a Ford 8.8 out of an 96 and newer Explorer.

Figure out what year, make and model your powertrain choice came with from the factory. Buy an entire vehicle complete.

Figure out what adapters for: motor mounts, cooling system, fuel delivery and driveshafts you will need to make it all fit together with decent driveline angles.

Check out Novak, Advanced Adaptors and JBconversions for your choice of adapters.
AdvanceAdapters.com | Engine & Transmission Conversion Adapters - Advance Adapters
JB Conversions, Inc.
Novak Jeep Conversions - Home

ALSO, Check our vendor section for potential deals on adapters, they seem to have a running deal going on Tcase SYE and driveshafts.

What adapters are not available? work out what modifications can you make to get your choice to work, and what would you have to PAY someone to do.

Thats the easy part, now you have to figure out wireing, where do you want the computer to sit? Do you feel confident you can mod the wireing and computer yourself? or do you need to pay someone to do it?

Do you live in an emissions state? If so you need to make sure your mod conforms to this equation:
Donor drivetrain = your Jeeps model year or newer
Donor vehicle emissions components transferred to your jeep
MIL working correctly
Aftermarket parts that effect emissions approved by C.A.R.B. (in most states)

For cali, after you are done, you have to visit the referee, he issues a new sticker with the year of your vehicle, the year of the donor engine, and what components are required, future smog checks will have this sticker entered into the smog machine to eliminate any discrepencies between your car in stock form, and your new drivetrain so the state doesnt go into shock because its different then stock.

This might be similar in other states.


The easiest conversions out there and GM V8 and V6 drivetrains, there is more aftermarket support available for those conversions into your Jeep.

Check out the builders section of our forums for options and potential solutions to issues others have had.
Though its not wranglerforum.com you also might want to check out other Jeep forums, and Pirate4x4.com for more potential solutions, there is a WEALTH of information available on the internet, take FULL advantage of it.

This is true for ANY engine swap in ANY vehicle (only Jeep specific part is the Ford 8.8 part) . if you want more information, you have to give us more detail about your Jeep, and your expectations.
Year, transmission, and gear ratio in your Jeep is a great start....
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Old 07-29-2012, 07:43 PM
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It's definitely multi port fuel injected just went out and double checked. I think it may be in serious need of a tune up. It's been doing alot of missing and hesitating during acceleration. When we changed the oil it looked like its been in there for a VERY long time. Right now I've got the interior stripped out trying to clean things out but will be tearing into the engine next. It's stock gears for a 95...whatever would be there. Don't think it had the towing package. Stock 3 speed auto trans. If I have trouble climbing hills now i don't want see what it will be like when its lifted with 31"s trying to go up to big bear.
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Old 07-29-2012, 08:47 PM   #6
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Do me a favor, snap and upload a pic of your engine please....
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Old 07-29-2012, 11:27 PM   #7
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I'll second that...

Though if it has an auto transmission something tells me it's MPFI, I don't think YJ's came with auto's behind the 4 cylinder until 1991..

Something as simple as a tuneup can restore about 10-15hp depending on how dirty and bad components are.
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Old 07-29-2012, 11:36 PM
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Yeah I snapped a pic when i go upstairs to my other computer i'll upload it.

The only reason I know it's not the original motor....is because i decided to be lazy and take it to get the oil changed...the place couldnt find a filter to fit my jeep. After getting the jeep back home and checking the part number on the old oil filter they put back on my jeep...it turns out it was an oil filter from a late 80's early 90's cherokee 2.5L. So that tells me that the 2.5L in my jeep definitely isnt from a 95 wrangler.
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Old 07-30-2012, 01:11 AM
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Here's a shot of the engine.

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Old 07-30-2012, 01:58 AM   #10
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That is not from an older Jeep, that was the 2.5L that was used in the 92 and newer YJ.

What makes you think it was from an older "(late 80's-early 90's cherokee 2.5)"? the late 80s and up to 91 used a TBI setup, not 100% sure about the Cherokees, but its PFI, so it would be the same setup for your Jeep if yours is a 92+

This is me abusing my assumption that the Cherokees used the same TBI motor till 91 that the YJs did.

Reading your first post I was expecting a carberated engine...
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Old 07-30-2012, 02:21 AM   #11
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Swap in a 5spd manual. Though they are no racers I personally think these 2.5's aren't all that bad. Just rev 'em out some and get in that peak torque zone. Up around 3500 rpm's they will climb some good grades at speed.
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Old 07-30-2012, 07:14 AM   #12
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Quote:
Originally Posted by 2xs View Post
That is not from an older Jeep, that was the 2.5L that was used in the 92 and newer YJ.

What makes you think it was from an older "(late 80's-early 90's cherokee 2.5)"? the late 80s and up to 91 used a TBI setup, not 100% sure about the Cherokees, but its PFI, so it would be the same setup for your Jeep if yours is a 92+

This is me abusing my assumption that the Cherokees used the same TBI motor till 91 that the YJs did.

Reading your first post I was expecting a carberated engine...
mines a 1991 and i have that engine bud
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Old 07-30-2012, 09:48 AM
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That is not from an older Jeep, that was the 2.5L that was used in the 92 and newer YJ.

What makes you think it was from an older "(late 80's-early 90's cherokee 2.5)"? the late 80s and up to 91 used a TBI setup, not 100% sure about the Cherokees, but its PFI, so it would be the same setup for your Jeep if yours is a 92+

This is me abusing my assumption that the Cherokees used the same TBI motor till 91 that the YJs did.

Reading your first post I was expecting a carberated engine...
The only reason I know it's not the original motor and from an older jeep is the oil filter is metric instead of standard....so the normal oil filter for the 95 (which is standard thread) wont work on my engine.
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Old 07-30-2012, 09:50 AM
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It's also possible that who ever rebuilt the engine in this jeep...used a block from an older engine but used all of the original top end stuff from the motor that came in my jeep. That would explain the oil filter.
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Old 07-30-2012, 02:13 PM   #15
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Swap in a 5spd manual. Though they are no racers I personally think these 2.5's aren't all that bad. Just rev 'em out some and get in that peak torque zone. Up around 3500 rpm's they will climb some good grades at speed.

Yeah i have a 91 with the 2.5 with 5 speed trans. I run 75-80mph every day on the highways in West Virginia. Not to many flat roads here
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Old 07-30-2012, 03:34 PM   #16
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Wow, I have a 93 with a 2.5 manual and I can barely get to 60 mph downhill. I Aldo only have 31" tires and stock suspension
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Old 07-30-2012, 03:53 PM
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I can do 75-80 on the highway if its flat...just I'm in a valley type area so to get out of here I have through climb through hills. I also plan on going to the mountains alot come winter time...whole reason i got this thing was because my 370Z probably wont do so well climbing up mountain roads in the snow.
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Old 07-30-2012, 11:30 PM   #18
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It's also possible that who ever rebuilt the engine in this jeep...used a block from an older engine but used all of the original top end stuff from the motor that came in my jeep. That would explain the oil filter.
^ This, I have a 90 TBI motor, and it has a different Valve cover, im assuming that when they changed to PFI, thats when the Valve cover switched.
Of course, I hate popping my hood, and seeing that little 4, so....

brb...
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Old 07-30-2012, 11:38 PM   #19
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Yes, my TBI 2.5L is different.

So yours came with a 2.5L Port Fuel Injected motor.

I really think the "Older" engine was a core that was rebuilt using most of your original engines pieces, regardless, back to your original question:

The 2.5L is a boat anchor, it will last you years, but youll get there slowly.

As far as engine swaps, see my big post, all the information is relevant to your swap.

Quote:
Originally Posted by VinceTj View Post
mines a 1991 and i have that engine bud
Congratulations!
can you do me one favor? whats the build date? I was under the impression 91 was the last year of the TBI 2.5L, but if yours was a late build 91, you might have gotten lucky with a PFI one, or I was misinformed.

bud.....?
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Old 07-31-2012, 12:19 AM   #20
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'90 was the last year of tbi on the fours and renix on the 4.0. That was the last year of the contract with renix that Chrysler inherited with the purchase of amc. Starting with the '91 Chrysler started using their own injection system.
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Old 07-31-2012, 12:38 AM   #21
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'90 was the last year of tbi on the fours and renix on the 4.0. That was the last year of the contract with renix that Chrysler inherited with the purchase of amc. Starting with the '91 Chrysler started using their own injection system.
BAH! I got stuck with the last year of the trash injection, there is a reason my old Dodge friends call it toilet bowl injection, lol
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Old 07-31-2012, 12:55 AM
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Well once I get done with my interior....it will be time to tear into the engine I guess. Now it's time to make the decision to keep the 2.5 or swap in a SBC
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Old 07-31-2012, 02:55 AM   #23
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Indeed, 1991-1995 model years were when MPFI was utilized on the 2.5L engines with the YJ.

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