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Old 02-19-2012, 07:49 AM   #31
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thats my point.who with the 2.5 hasent wanted the first sentence

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Old 02-19-2012, 08:00 AM   #32
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My Jeep is for around town and offroad. I treat it like I stole it and like my little 4 popper. If as one guy said he wanted to go fast why handcuff yourself to a Jeep at all? Onroad the 4.0 is far and away the best, once you leave the pavement I find very little difference. Just get something you like and enjoy it.

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Old 02-19-2012, 08:12 AM   #33
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the only good thing about the 2.5 is it's nearly indestructible. i've run mine out of oil. i've run it out of coolant and drove for miles with the temp guage pegged (i've been trying to blow it up so the other half doesn't question me about the motor swap i'm doing). all it does is lose what little power it had to start with. had 32's on it and with stock 4.11 gears 3rd gear up hills was common. with 30's 4th gear up hills is common. it is a good little motor, but it doesn't have any useful cajones for 45+ mph.

btw if you want good gas mileage a honda civic is your best option.
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Old 02-19-2012, 04:51 PM   #34
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4vs6

Let's see, the 4cyl is as capable off highway as the 6cyl. I will buy that and find it to be quite true. In fact, I find it more capable due to its weight and engine space.

The 4cyl is fine around town and the 6cyl has no real advantage. I'll buy that too from my experience with both.

So, the only place that the 6cyl is marginally better is on the open highway, and then only on hills.

So, for "maginally" better performance during probably 2% of its use, it is more expensive to maintain, less gas mileage overall, more expensive to repair for anything involving cylinders (has two more), less engine compartment room, more complicated to work on....That's enough for now.

Hardly a situation where the 6cyl has any real advantage overall. In fact, if it has any advantage at all, then it loses that advantage against a v8 that would be better yet and would have some "real" performance advantage.

Or is the real advantage the macho image when accelerating from a stop sign or against some other vehicle????

Overall, I think the 4cyl wins with its advantages outweighing the few where the 6cyl is marginally better.
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Old 02-19-2012, 05:14 PM   #35
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The 4.0 actually gets a little better fuel mileage if you look it up but not much. But if you have the bigger tires and do alot of highway driving you'd be much happier.
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Old 02-19-2012, 08:23 PM   #36
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Let's see, the 4cyl is as capable off highway as the 6cyl. I will buy that and find it to be quite true. In fact, I find it more capable due to its weight and engine space.

The 4cyl is fine around town and the 6cyl has no real advantage. I'll buy that too from my experience with both.

So, the only place that the 6cyl is marginally better is on the open highway, and then only on hills.

So, for "maginally" better performance during probably 2% of its use, it is more expensive to maintain, less gas mileage overall, more expensive to repair for anything involving cylinders (has two more), less engine compartment room, more complicated to work on....That's enough for now.

Hardly a situation where the 6cyl has any real advantage overall. In fact, if it has any advantage at all, then it loses that advantage against a v8 that would be better yet and would have some "real" performance advantage.

Or is the real advantage the macho image when accelerating from a stop sign or against some other vehicle????

Overall, I think the 4cyl wins with its advantages outweighing the few where the 6cyl is marginally better.
Now the 4.2 and the 2.5 are much closer to what you are comparing. The 4.0 is what everyone is talking about (91 and up)
In stock form I could almost agree with you, but "marginal" gains?
It isn't about anything macho for me personally but it may be for some, if so I wouldn't have traded my 350+ H.P. K-5 for my 2.5 YJ.

I read these forums over and over and looked at the specs i posted above, and against my better judgement even after seeing the "it didn't work out on paper" I took the bad advice and got the YJ I have now with the 2.5. After people saying the 2.5 "could keep up with their friends 4.0" on the street and was "better on gas" and that kinda stuff . Man was I disappointed. I am not trying to bash the 4 banger, just trying to be honest to the next guy.
People can get as pissy as they want but I have owned a 95 YJ with 33's and a 4.0, and now own a 90 YJ with a 2.5. The 2.5 is nothing near marginally close to the 4.0. Off road the 2.5 does well but can never have the torque the 4.0 or the 4.2 produces on hill climbs. Yes they can go the same places but not without a lot more effort. The 2.5 does use less gas when idling a lot and slow wheeling, but uses the same if not more on the road over 45 mph.
The 2.5 is a good little motor for what it is, but I just can't see how people can compare the two of them to being close.
As far as the extra space, what are you going to put in there? I have 5 4.0's that my family drives daily and never had any trouble working on them due to space under the hood. Just more room for water to splash I guess
A side note none of the 4.0's have less than 200,000 miles on them and I will put them against any stock 2.5.
The reason I am into this conversation so deeply is that I got a 2.5 YJ based on people giving false claims about how the two are so close, and I would like to pass what I know on. Isn't this what the forum is about?
Just look at all the posts about the 2.5's needing more power, and asking what is wrong.
Don't get me wrong I have grown to really like my rig, but I do miss the 95 4.0 I had to sell to pay for my divorce.

To the original poster...... good luck on what you decide to get as long as it is a Jeep you are family no matter what engine you have

Sorry to get this post so long
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Old 02-19-2012, 09:23 PM   #37
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I had a 2.5 in my tj and when i went looking for a yj i was not swayed away from the 2.5. It serves my needs perfectly as a DD and a wheeler. Granted the fastest I ever go is 50-55 and it does fine at and up to that speed same as the tj did. 20 mpg is not great but better than the 14 in my truck and way more fun to drive.

Do i wish i could have gotten the 4.0? NO. If i had found my exact jeep with a 4.0 5mt for the price i paid would i have passed it up? NO.

Am i happy with my 182k mile 2.5? Yes.

Opinion aside, take it for what you will.
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Old 02-20-2012, 12:10 AM   #38
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I inherited my jeep and love the 2.5. That being said I have had a hard time keeping in 5th gears and a headwind, have to downshift to get up overpasses and have given up on passing anyone. If I were to buy a jeep it would not be a 4 cylinder. 2 more cylinders and 60 more hp is a no brainer
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Old 02-20-2012, 07:59 AM   #39
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I'd like to know where you got a 2.5 that gets 20mpg. My sticker on my 2006 6 speed is 18 and with lift and 32 tires I get around 15 mpg and can barely use 6th gear. I've drove a 4.0 and I'm on the highway alot. 4.0 is more power and better. 2.5 SUCKS! That's all there is to it. Cold air and disconnecting fan and putting electric fan doesnt do much. Unless your just driving around the city all day the 4 banger isn't the one.
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Old 02-20-2012, 08:23 AM   #40
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I think all this comes down to a simple few facts. Neither one of them are race cars. OFFROAD the 4 will serve MOST people well. In the TJ the initial cost of a vehicle makes the 4 a reasonable starter Jeep. There are multitudes more 4's for sale at a better price. If your not in a hurry or do much highway driving the 4 will serve you well. The 6 has more potential for an advanced offroader and is way better on longer drives. After all is said and done it comes down to what you plan to do with it.
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Old 02-20-2012, 08:39 AM   #41
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2.5 power level

I think that most of the feelings that the 2.5L doesn't have any power on the highway comes from the hesitancy to run it up in rpm. I don't find any problem running it up into the 4000 rpm band and it has pretty good power.

I used mine to tow my 29' self contained trailer for many many miles on the interstate without any issues. Admittedly, I was not in an area of significant mountains. But one trip from Minneapolis, MN to the Jeep Jamboree in Sturgis SD certainly wasn't flat all the way. Coming back I was able to hold 70-75 virtually all the way. Total trip back was 10.75 hr and that included fueling stops. Averaged right at 11 mpg. That was running 4th gear virtually all the way.

As far as off road goes, I guess you can get into a situation where Low Range and Low Gear isn't enough torque with the 2.5 and it would be with the 4.0 but I can't really imagine. It would seem to be a situation where I would be using the starter motor for that kind of crawl.

I haven't owned a Wrangler with the 4.0, however, I have owned several Cherokees and Wagoneers with it. I used my 88 Grand Wagoneer (the small one with dual headlights) to tow that same 29' trailer and it didn't handle it one bit better. It did have the automatic and that would have made some difference, but only marginally.

I also had an 86 Ford extended cab with the 302 and it wouldn't pull the trailer as well as the Wrangler. But again, it had the automatic.

If you don't put in an electric fan, you don't have any more room in the engine bay with the 2.5L than you do with the 4.0L. However, it is easier to put an electric fan in a 2.5L vehicle.

So, from my experience, I find the 4.0L to be marginally better than the 2.5 in the area of power. And I would suggest that the reason there is so much back and forth about the difference is because, overall, there is only marginal difference. And it is up to the inidividual using it to make the assessment of whether that difference is of significance to them in how they use the vehicle.
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Old 02-20-2012, 12:55 PM   #42
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The AMC 150 engine makes it's most HP at 4200rpm, can easily be ran to 5000rpm if you want to. People think it's running it hard, over revving, etc, but it's NOT. The engine was designed to do that. How is running an engine where it was designed to be ran running it too hard? Doesn't make sense.

I guess all of these detroit diesel semi-trucks should stop running at full throttle all day every day, because "they're running them too hard". Last I checked, a lot of those trucks will go over a million miles, because they were designed to be ran like so.

AMC150 is not a highway hazard. If you're not careful you risk over-speeding. I know this because I've had mine up to 81mph on level ground, via GPS- if I pushed it harder we would have gone faster. That's with 3.55 gears in the rear, and 29" tires. He who can't keep up on the highway does not know how to drive the 2.5. Or there is something horribly wrong with your engine- either way, it's not the engine that's at fault, it's operator error for failing to properly operate and maintain his/her vehicle.

I may only be getting 9mpg (exhaust manifold leak somewhere- can smell the unburnt gas pour into the cab) but at least my 2.5L can keep highways very easily. It's funny, because even I can pass semi tractor-trailers going uphill. I live atop a 4 mile stretch of 7% grade, and if I wanted to I can run the 55mph speed limit the whole way. I don't because like I said my bad MPG issue is magnified going up the hill.
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Old 02-20-2012, 01:20 PM   #43
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4.0 there's no other way to go. Rhyme not intended lol
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Old 02-20-2012, 03:21 PM   #44
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I've got big tires and 4inch lift with the 2.5. Very nice condition and I take very good care of it. I still say the 4.0 in my buddy's jeep with same set up drives alot better. GO 4.0!! Lol
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Old 02-21-2012, 10:55 AM   #45
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Cool

i get the feeling some people love that little 4 cyl hunk of scrap a little too much. theres a reason a 4 cylinder isn't even standard equipment on a jeep anymore. poor power output. the fact that the 4.0L gets the same if not better gas mileage with better power ouput makes this a no brainer. just because you CAN wind a motor close to its rev limit to get the power out of it doesnt mean you should have to when there are better options. the diesel comparison somebody else wrote is an apples to oranges comparison. heavy duty truck diesels are designed to work in a limited operating range that rarely exceeds 2000 rpm. they work on completely different operating principles and are designed to run near full throttle all the time for best power AND fuel mileage.

i bought my current jeep as a 4 cylinder because it was dirt cheap. you can't buy a 6 cylinder wrangler for what i paid for mine. i already knew that the motor no matter what it was was coming out before the ink on the paperwork was dry. if you're modifying your jeep and don't ever plan on a motor swap you will be ultimately happier with the 4.0L. the last jeep i had was equipped with the 4.0L and it ran beautifully until it was rearended which totaled it. it wheeled great, would tow great, cruised great, and had good gas mileage. it was getting 18-20 on the highway with no issues.
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Old 02-21-2012, 02:36 PM   #46
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It is good...

It is good that there are those that are down on the 4cyl. That makes them cheaper and more readily available to those that find them adequate, or even preferable.
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Old 02-21-2012, 02:43 PM   #47
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i get the feeling some people love that little 4 cyl hunk of scrap a little too much.

theres a reason a 4 cylinder isn't even standard equipment on a jeep anymore. poor power output.


you will be ultimately happier with the 4.0L.
Except you're speaking your entire opinion here. The Jeep has evolved from an offroaders dream rig to a soccer mom vehicle, thus why they've ditched the 4 cylinder entirely and went to something all mothers can use to tow their kids around in. It's not an offroad toy anymore.

Whether you like it or not, the 4 cylinder engine is not a pile of crap, it's MORE than adequate enough for the Jeeps as they sit. Stock vs stock, 2.5 or 4.0, the only thing the 4.0 has on the 2.5 is the fact that it can get up to speed faster.

Stop with your postings about it, you're trying to portray something as fact, when it is your own opinion. And for what it's worth, opinions are like ass *****, everyone has one. They can be wrong as well.
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Old 02-21-2012, 03:51 PM   #48
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Except you're speaking your entire opinion here. The Jeep has evolved from an offroaders dream rig to a soccer mom vehicle, thus why they've ditched the 4 cylinder entirely and went to something all mothers can use to tow their kids around in. It's not an offroad toy anymore.

Whether you like it or not, the 4 cylinder engine is not a pile of crap, it's MORE than adequate enough for the Jeeps as they sit. Stock vs stock, 2.5 or 4.0, the only thing the 4.0 has on the 2.5 is the fact that it can get up to speed faster.

Stop with your postings about it, you're trying to portray something as fact, when it is your own opinion. And for what it's worth, opinions are like ass *****, everyone has one. They can be wrong as well.
yeah i could be wrong. you could also be wrong. we are all expressing our opinions. and i think that was what the original poster was asking. no need to get all emotional about it. and thank you. for proving my point in the first sentence of my last post.
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Old 02-21-2012, 10:27 PM   #49
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I think the nicest way to say it is, look at all the posts about "2.5 to 4.0" swaps, and posts about trying to get more power for the 2.5.
Really, there is nothing wrong with any motor if it makes the owner happy. On the other hand some folks aren't happy with them, which seems to be more often than those that are happy with them.
As far as stating facts that has been done over and over. Some just can't see the facts for what they are. Each to their own

By the way................Jatt-Yj did you make up your mind yet?
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Old 02-22-2012, 09:04 AM   #50
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I was wrong. My 94 is a 2.5 and my 2006 is a 2.4. Even worse. Lol
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Old 02-22-2012, 02:19 PM   #51
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The 2.4L engine has a lot higher power output than the 2.5L....... But an LJ is a rather big Jeep compared to a TJ...
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Old 02-22-2012, 11:51 PM   #52
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I was wrong. My 94 is a 2.5 and my 2006 is a 2.4. Even worse. Lol
ever thought of a turbo swap on your '06? dodge neon srt-4's used a turbo version of the same motor which in its best year made 245hp and thats just stock. there's a lot of potential in that motor. it'd be a headturner i guarantee that.
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Old 02-23-2012, 12:25 AM   #53
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I had a 2.5L and it got 14mpg with 4.10's and 33's. If you are concerned about gas milage, don't buy a Jeep. Buying gas will be the least of your worries!

While the little 2.5 was unstopable in 4L, on the highway it was a moving road block.

I'm pulling mine out now and dropping in a 5.3L V8. I should get 18-20 mpg and more than double the HP and torque.

So to answer to your question: Buy any Jeep, yank the motor, convert it to a 5.3, increase your milage 30%. PROBLEM SOLVED!
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Old 02-23-2012, 12:33 AM   #54
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So to answer to your question: Buy any Jeep, yank the motor, convert it to a 5.3, increase your milage 30%. PROBLEM SOLVED!
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Old 02-23-2012, 05:17 AM   #55
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Get a Toyota.

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Old 02-23-2012, 07:05 AM   #56
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h2 or h3. jeeps suck
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Old 02-23-2012, 10:25 AM   #57
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suzuki samarai
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Old 02-24-2012, 07:54 AM   #58
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What's it gonna cost you to put that 5.3 in it? And are you adapting everything to the transfer case or what? I've really been thinking about doing that.
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Old 02-24-2012, 12:11 PM   #59
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Thanks for all the help i bought a 4.0L i dont care about how much gas it takes and stuff the only that matters at the end of the day is its a Jeep
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Old 02-24-2012, 12:41 PM   #60
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Get a Toyota.

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