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Old February 24th, 2010, 08:19 PM   #1
yellowknife
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Default Wrangler: 4.0 vs 2.5

So what are the pros and cons of both. I am looking to get a wrangler soon, probably a TJ, and I want to know which engine is all around better. How much does the 2.5L lack in power? Is it really that much better on gas than the 4.0? Which engine is more durable and will last longer? Is one more able to be modified than the other? Is the 4-cylinder just as capable off road as the 6? If anyone has the answers, it would help me out a lot. Thanks.
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Old February 24th, 2010, 08:20 PM   #2
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Go with the 4.0. The 2.5 is a turd and it's not much better on gas if at all. The 4.0 is more easily modded. The 2.5 is just ok off road and even then, you will definitely want to re gear if you go any bigger with tires. In my opinion, the only thing the 2.5 will do for you is save a bit of money on the purchase price.
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Old February 24th, 2010, 08:23 PM   #3
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really just depends on the setup your going for. For an ultimate wheeler some say 4.0 for a driver/weekend warrior some say 2.5. Id say go 4.0 alot of people say they wish they would have gotten the 4.0 > 2.5.. Both motors are bullet proof just dpends on the driver really. So the next question is, what is the jeep going to be used for?
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Old February 24th, 2010, 08:23 PM   #4
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Doesn't even consider the 2.5L, unless its an incredible deal.

4.0L's last much longer, make more power, and get nearly the same gas mileage as the 2.5L.
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Old February 24th, 2010, 08:45 PM   #5
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4.0L x1,000,000
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Old February 24th, 2010, 08:59 PM   #6
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Quote:
Originally Posted by 91XJTim View Post
really just depends on the setup your going for. For an ultimate wheeler some say 4.0 for a driver/weekend warrior some say 2.5. Id say go 4.0 alot of people say they wish they would have gotten the 4.0 > 2.5.. Both motors are bullet proof just dpends on the driver really. So the next question is, what is the jeep going to be used for?

I've never heard anyone refer to the 2.5 as "bulletproof", but I have seen a lot of jeeps with blown 2.5's, or recently replaced ones. Go with the 4.0 hands down, more power, torque, reliability, and easier/better to modify.
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Old February 24th, 2010, 09:06 PM   #7
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some of the 2.5L ive been around are like ticking time bombs. Some go off others dont but i guess that could be any motor as well
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Old February 24th, 2010, 09:22 PM   #8
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I've never heard anyone refer to the 2.5 as "bulletproof", but I have seen a lot of jeeps with blown 2.5's, or recently replaced ones. Go with the 4.0 hands down, more power, torque, reliability, and easier/better to modify.
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some of the 2.5L ive been around are like ticking time bombs. Some go off others dont but i guess that could be any motor as well
I have had both replaced both am replacing the 2.5 now as we speak grr I would take the 4.0 over the 2.5 any day. As it does have more power. easier to mod. I would take it any day and it will last as long as you mantian it. Mine blew at 216,000 but there are some on here that wheel the heck out of the 2.5 you can read up on them at 4banger.com. Just my two cents
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Old February 25th, 2010, 12:55 AM   #9
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I drive the 2.5. Honestly, I've had really good luck with it. DO I want more power, yes... Do I need more power, almost never. I've been wheeling for about 9 year on my jeep and can count on 1 hand the number of times obstacle failure was due to the motor. Part of that is the way I wheel and part is the terrain I wheel on. Having said that I think many obstacles would have been easier with a bigger motor but in general I'd be willing to put my 2.5 up against a 4.0 anyday.

If you're considering the 2.5 for gas mileage, don't bother. I'm getting the same or shittier gas mileage than my 4.0 friends.
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Old February 25th, 2010, 01:28 AM   #10
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I have a 94yj 2.5 4.88 gears, trails and mudding it's great, trying to pull a trailer crap, trying to drive at highway speeds it will do 70, but I go 65, very week on the road, but tight twisty trails in 4 low 2-3rd gear it holds it's own. At least if you floor it parts usually stay together , besides I get alot of compliments on it so I guess it's worth it. 4.0 all the way if I did it again
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Old February 25th, 2010, 01:53 AM   #11
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4.0l=AX-15 Strong
2.5=AX-5 Very Week

2.5 modded to the hilt= Stock 200,000 4.0l

Not even a compromise IMO.
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Old February 25th, 2010, 06:48 AM   #12
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Most 4 bangers can't even use the fast lane on the freeway. They do fine in the trails though, not as well in the mud or sand, but they get it done.
the 2.5L is way over-worked in a 3300 lb Wrangler. I think that is a big part of their durability issues over a 4.0L.
I had a 2.5L once. It was such a turd I put a turbo on it. Never again for me.
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Old February 25th, 2010, 07:12 AM   #13
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go for the i6....the only part i seen on the i6 that has problems is the header....
other then that...it reminds me of my 1953 farmall ....dont matter what u do to it...it will just keep going

imo the i6 is a little underpowered ...but the power it has is perfect for what michigan has to offer.
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Old February 25th, 2010, 07:25 AM   #14
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Not even a compromise IMO.
My thoughts too.
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Old February 25th, 2010, 07:38 AM   #15
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I've had both, If your not highway driving you will do ok with the 2.5. 4.0 is a better quality engine. The bad header went away in 2000 for sure pehaps 1999. There are now 2 down pipes that join a ways back. (you can retro the new exhast) I never felt bad about owning a 4banger but cringed when ever I saw one while looking for my 2nd Jeep. Stick shift is better on the 2.5. 2.5's suck in a headwind over 50-55.
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Old February 25th, 2010, 10:28 AM   #16
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Buy what you really want the first time.

We've seen way too many people that have pissed themselves off by trying to save money with a 2.5 and then have to replace it, deal with the POS AX-5, or attempt a driveline swap.

Buy the 4.0.
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Old February 25th, 2010, 10:31 AM   #17
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4.0L More power than the 2.5L, same gas mileage.

I had a 2.5L in my '95 YJ. It sucked. Only good thing about it was all the 2.5L came with 4.11 axle ratios.
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Old February 25th, 2010, 11:01 AM   #18
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i HAVE THE 2.5 GET THE 4.0

I hate the top speed of my jeep. It lacks the get up and go. Off Road i have not had any problems but we really dont abuse it.
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Old February 25th, 2010, 11:41 AM   #19
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Go drive one of each, I think the answer will sort itself out.
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Old February 25th, 2010, 04:28 PM   #20
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Go drive one of each, I think the answer will sort itself out.

LOL thats the truth
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