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Old 05-18-2011, 12:35 PM   #61
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I love my 2.5 too. Just but a rebuilt in from NAPA. Having issues though with timing. If ANYONE an help..please do. See my post... Help!! Crankshaft positions sensor VS flywheel. Thanks.....
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Old 12-06-2011, 09:26 PM   #62
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I have had both four and six cylinders. I just sold my sprung over yj 4.0 for a stock 2.5 yj. I have seen four bangers go where the sixs and v-8s didn't. This is my forth yj and I will never buy another 4.0 again. 4 cylinder fury haha.

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Old 12-06-2011, 09:43 PM   #63
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Who needs to be quick when we can take the shortcut?!?!
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Old 12-06-2011, 11:46 PM   #64
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so far i like the 2.5, but havent had a chance to get it out on the highway yet, eventually i want to drop my 383 sbc into it and forget about gas mileage...but for awhile it will stay, until it gives out of course
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Old 12-07-2011, 07:27 AM   #65
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2.5 capability

The issue that most people have with the 4cyl is that idiot arrow that tells you to upshift. Put tape over it.

When I got my 94 2.5 it was totaled with 16,000 miles on it. Rebuilt it and people said it was anemic and would hardly pull itself. I told them I wanted a vehicle I could use to tow my hunting trailer to the site and hunt with when I got there, and didn't want to buy a gas station to do it.

When I put the class V hitch on and reinforced it to the frame they laughed.

When I got back from the Jeep Jamborie in Sturgis they didn't laugh any more. 600 miles, 10 hours (including fueling time) pulling a 29' self contained trailer (about 6,000 lb) at 11mpg. Typically running 75-80 on the interstate. (I wasn't passed by a semi the entire trip but I did pass quite a few.)

The key is to drive the engine, not the speedometer. Keep the engine in its power band. It is MUCH better to run that engine continuously at 3500-4000 rpm than to lug it at 2000 rpm. Bearings wear less when spinning under light load than when turning under heavy load. The load is proportioned out over the time period that the crank is under compression/load. Spread the load over twice as many revolutions and you have a LOT less wear. Remember why you bear down on a file, or sandpaper, when you want to cut out more material.

If you want more power on the 2.5, just shift down!
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Old 12-07-2011, 08:58 PM   #66
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I would aggree with running the 2.5 at higher rpm's to get more speed out of it, but I for one still am not what I would call happy with the 2.5 somewhat content would be a better description. Granted I have 33's on it with stock gears but even with 235/75's it was weak.
For those that compare the 2.5 to a 6cyl I will never understand how people think they are even close in power. (I own 3-4.0's now, and have had several in the past)
The gas mileage isn't much better for the lack of power and torque. Mine gets 15-17 with the set-up I have now, and my 88XJ with 275,000k gets the same. My 98 ZJ gets 18-20 with 31's wuth mixed highway driving.
I personally would not feel comfortable pulling any kind of load with it. I have tried and was disappointed.

However.......when the 2.5 is in 4low, it shines for me. That is where it really has impressed me. I almost like it as much as my 4.0's. To me that is the only saving grace because I use it as much off road as on road.
Just my .02

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Old 12-07-2011, 10:14 PM   #67
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mods on my 2.5 make a 4.0 not pencil out.....unless you tow

a 20 gallon tank makes my 2.5l go pretty dam far. Out there I have learned distance is a better attribute than power.

I have a roof rack and a dirt bike hitch which is all I need. It pushes fully loaded just fine.

But V8/V6 do sound nicer


2.5 > 4.0
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Old 12-08-2011, 05:42 AM   #68
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I appreciate the fuel economy of my 2.5, especially considering the 33" tires. That said, there's a lot of times where I wish I had just a little more power. Even 20-30 HP would help get over the 50MPH limit that my 4.11 gears and 4 banger keep me at.
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Old 12-08-2011, 08:22 AM   #69
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I wish I could have the cash ,the tooling and the knowledge to rework the 2.5 into a 200 hp powerhouse .they do it with jap motors .why cant someone do this ?
is it just not possible? seems to be a ton of 2.5s in the world .and I belive if there were a kit to do this with .there would be a lot of beasted up 2.5s
I do love my little motor reminds me of a tractor putting trough the back roads .
it is what it is
mine dose perform well with the snorkel hooked up. pulls 10 times better than without.and getting 19 mi. to the gallon.
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Old 12-08-2011, 08:40 AM   #70
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Quote:
Originally Posted by denisbaldwin
I appreciate the fuel economy of my 2.5, especially considering the 33" tires. That said, there's a lot of times where I wish I had just a little more power. Even 20-30 HP would help get over the 50MPH limit that my 4.11 gears and 4 banger keep me at.
With all due respect, I have no idea what limit you're talking about. I'm on 33's daily and have no issues running it 70 (on the highway especially). As it was said before - stop paying attention to the shift light and run the motor at a bit higher RPM to compensate for tires. Another thing is, unless you had replaced speedo gearing to account for 33's you should be reading you speedometer as + 10 (or so) mph. So, stop complaining about your speed you're doing just fine enjoy you YJ.
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Old 01-18-2012, 01:44 PM   #71
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I love my 94 YJ 2.5 4 cyl. My first jeep I ever bought was a 98 cherokee sport with a 4.0, brand new 31" off road tires, paid $400 for it. steal. Anyways, looking back at the 6 and comparing it to my 4 now.... yeah it was nice to have the straight 6 on the highways, but my YJ gets me around just fine. When you decide to buy a wrangler, you're definitely not signing up for a race. I've just grown to love the 4 banger a lot more on the road and at the gas pump. two thumbs up for the 4 banger!!
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Old 01-18-2012, 02:52 PM   #72
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Just for the record... The 4 cylinder is actually less fuel efficient on the city streets and highways than the 6 cylinder is. Average highway mileage for a perfectly running stock 4 cylinder Jeep fresh off the factory floor was 17mpg. The stock 6 cylinder factory fresh Jeeps got 19mpg.

It's more fuel efficient offroad though. it has PLENTY of torque and just sips the gas on the trails.
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Old 07-08-2016, 01:34 PM
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I just hit 318,000 miles on an original 2.5 (top half have has been redone). Doesn't leak a drop. This thing is about indestructible.
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Old 07-08-2016, 07:05 PM   #74
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Well, as others have said, we get better mileage.... That's about all I can think of. It's big enough for me to get around, but not big enough to let me get in trouble. I think it's kinda the way jeeps were meant to be, kinda slow and not all that powerful.
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Old 07-08-2016, 08:29 PM   #75
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Add some rope and they work well keeping boat from drifting around
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Old 07-08-2016, 09:22 PM   #76
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but i don't think they where meant to have 31s heavy bumpers and a winch
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Old 07-12-2016, 09:42 AM
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I am at over 318000 miles on mine with only the top half rebuilt. It is about bulletproof.
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Old 07-12-2016, 09:42 AM
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Sorry for the double post.
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Old 07-22-2016, 05:09 PM   #79
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My feelings about the 2.5 are that it is adequate and that's about it. I purchased my '95 from my in-laws who were the original owners. It has 72k miles on it and has been babied it's entire life. New w/ 30's on it, it only got 15-16mpg. With 35's and 4.88's I'm getting 13.5ish. On the trail it's great, around town it's okay, on the highway,,,,,, let's just say there's a 360 getting rebuilt to take it's place.

P.S.- I also live at 5150ft elevation which kills hp and it's always windy here.
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Old 07-25-2016, 07:12 PM   #80
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Just out of curiosity, what was the gearing for the 2.5L with automatic? I would guess most likely 3.73:1 since it wouldn't have an overdrive to keep the RPM's down on the highway.
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Old 08-01-2016, 10:38 AM   #81
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I love the 4.0 6's, having had several in Cherokees. Having said that, the 2.5 is fine and reminds me of my 47 Willys cj-2 L-head but with refinements and fuel injection. So, over all, happy with it except for when I'm merging onto a busy freeway. Then it gets a little annoying.

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