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Old 05-09-2011, 02:24 PM   #1
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4 cyl?

Everytime I ask a question about which kind of jeep to get, everyone always throws in "make sure you get a 4.0l". Is the six way better then the 4? Ive found many good deals on the 4's but im not sure about them now. I plan to do alot of wheeling in it. Is there so major issues with the 4's?

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Old 05-09-2011, 02:44 PM   #2
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Originally Posted by bt-dub
Everytime I ask a question about which kind of jeep to get, everyone always throws in "make sure you get a 4.0l". Is the six way better then the 4? Ive found many good deals on the 4's but im not sure about them now. I plan to do alot of wheeling in it. Is there so major issues with the 4's?
I pulled a 4.0l on 35s out of water and mud on Saturday with my little 2.5 on 33s there's a video to prove it but i have to get the link I'm on my iPhone

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Old 05-09-2011, 02:47 PM   #3
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Old 05-09-2011, 02:57 PM   #4
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Well the engines do make a difference as far as power and torque where the 4.0 l6 has around 190 horses with about 235 lbs of torque and the l4 has around 120 horses with a measly 139 lbs of torque. They ads both equally reliable with l4 being slightly longer lasting. I guess I'd say it's all about how your gonna drive it and IF you know how to drive it. But if it's a 4 door or an automatic, you are a fool.
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Old 05-09-2011, 02:59 PM   #5
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I drive a manual 4 cyl, and have no complaints. Although I use mine as a DD so I kept it stock. You get into problems on a 4 cyl with an automatic trans and bigger tires.
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Old 05-09-2011, 03:00 PM   #6
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Of course, I'm not going to say a 4 cyl wouldn't do it.

Its just natural that an I6 or V8 would do it with less effort. Less effort = less high rev'ing = less wear and tear on the engine.
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Old 05-09-2011, 03:22 PM   #7
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My 4 cyl on 33s with a 4" lift has yet to let me down... I hit 75 on hwy and still offroad all time
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Old 05-09-2011, 04:00 PM   #8
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I have owned both and can tell you the 4.0 is a lot better but a 4 cylinder is still a good little engine and never let me down! Buy the 4 banger and later if you want more out of your jeep put a magnum v8 in it like I did with mine. Only thing that a 4 cylinder has issues overcoming is bigger tires. Then you just regear to compensate. But if you do get the 6 cylinder get one with a dana 44 rear and save some upgrading later.
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Old 05-09-2011, 04:00 PM   #9
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Originally Posted by bt-dub View Post
Everytime I ask a question about which kind of jeep to get, everyone always throws in "make sure you get a 4.0l". Is the six way better then the 4? Ive found many good deals on the 4's but im not sure about them now. I plan to do alot of wheeling in it. Is there so major issues with the 4's?
You find good deals on the 4 cylinders because they are not as much in demand. If you are mainly going to do off road driving on trails the 4 banger is good because you do not need the power, especially if geared properly. You need the larger engine when you are diving on the highways into head winds, up hills or with the a/c on. No matter what engine you have, you need to put proper gearing in if you change the size of the tires. A properly geared 4 cylinder will out perform an improperly geared 6 cylinder.
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Old 05-09-2011, 11:18 PM   #10
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i've had both and i prefer the I6. there isn't anything wrong with the 4, the 6 is just better plain and simple. i never went off road with my 4 banger but it was sort of hard to drive on the highway. i was struggling to do the speed limit and other cars were going 10 over. going around town it was fine and the way i drive there really wasn't much difference between the two. i also got about the same but a little bit better mileage out of my 6 just because everything is easier for it. by the way my 2.5 had over 280k miles on it when i sold it. i don't remember exactly i sold it last fall. if you decide to get the 4 banger get the standard trans.
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Old 05-09-2011, 11:38 PM   #11
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I've got a 2.5L with a 3" suspension lift on 32x11.5's and have zero complaints...

I get around 19 mpg, can get through anything, have zero problems in the trails (obviously not hardcore crawler trails) and it does great with street driving. Only thing i'd recommend getting the 4.0L for is if you're towing...

The main thing with getting a 2.5L though is to get a manual...
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Old 05-09-2011, 11:45 PM   #12
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6inarow, what kind of speeds were you doing? I can easily maintain freeway speeds, and I'm usually in the passing lane.
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Old 05-09-2011, 11:50 PM   #13
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Oh yeah...and i can also maintain speeds on the highway no problem...
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Old 05-10-2011, 12:32 AM   #14
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I've owned both, granted my i4 was in bad shape. It was a good engine but 60 was my max running super swampers. And hill climbs were fun. But a lot of guys prefer the i4. Just not me. My 4.0 is so better in my opinion.
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Old 05-10-2011, 05:17 AM   #15
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my 4 has 250k on it and is either due for an overhaul in the near future (no major probs w/it, just in my mind its time for major maintenance)or what I really wanna do is swap it to an I6.

Can I get some feedback on this, cause I also want to totally eliminate the computer from my vehicle. I prefer an engine that 'I' can work on and I only know older motors. I have found a I6 from a 79 (I think 79) Wrangler...

Educate me please!
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Old 05-10-2011, 06:03 AM   #16
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I hada 4 in my tj with a 5 speed with 33" tires. It struggled a bit on the highway. It was pretty good in town under 50mph. Off road it was fine too, I never needed more power just more traction.

I have a 4cyl 5psd yj now. Its running 30" tires. No problems in town at all, gets around 20mpg. I have not had it off road yet but... It also seems to struggle above 65 mph but frankley I very rarely drive that fast.

My tj had 60k miles on it and ran great, my yj has 180k miles on it and runs great. Go figure.
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Old 05-10-2011, 06:11 AM   #17
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Go drive one of each and see which you like. The positive for the 6cly, is that many of the TJ models came with a dana 44 rear, which is a nice upgrade.
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Old 05-10-2011, 10:35 AM   #18
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I have the 2.5. It is a little slow on the freeway, but will get you from A to B. It works great on the trail though IMO. I have not been stuck yet. If you get the 4 and are worried about getting stuck, get a winch. I have an 8000LB and the only tome I have had it off the spindlie is to do Maintenance.
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Old 05-11-2011, 12:51 AM   #19
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6inarow, what kind of speeds were you doing? I can easily maintain freeway speeds, and I'm usually in the passing lane.
it could go barely 65 with my foot to the floor on flat ground. 280k miles and all.
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Old 05-11-2011, 01:53 AM   #20
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As of today, I'm moving from a 2.5L YJ to a 4.0L TJ....and I wish I had done it sooner. Being able to pass a car in a hurry on the highway is something that I haven't been able to do in a long time. Being able to go 75 is also something I haven't been able to do in awhile as well. Also, a lot of 2.5L didn't come with air conditioning....and if it did good luck running it on the highway. I know a lot of people say just put the top down, but there is something to be said about being stuck in traffic on a 90 degree day and feeling comfortable in your vehicle.

I used to defend my little 2.5L to the bitter end, but I've seen the light.

The 2.5L is a reliable engine, and it's a great engine in 4Lo.....but it's just not for me anymore.
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Old 05-11-2011, 09:22 AM   #21
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My 4 banger will walk through mud, climb mountains, crawl over rocks, and cruise the backroads with the best of them. However, I make dang sure there is nothing coming if I have to pass a car and I tend to avoid freeways. Anything 55 or above it has a serious lack of power. Get you a good 20 mph headwind and you can forget 5th gear! All that said, I'm perfectly happy with my 4 banger and got it much cheaper than a equal year and shape I6 would have run me.
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Old 05-11-2011, 09:26 AM   #22
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Originally Posted by arcountryboy
My 4 banger will walk through mud, climb mountains, crawl over rocks, and cruise the backroads with the best of them. However, I make dang sure there is nothing coming if I have to pass a car and I tend to avoid freeways. Anything 55 or above it has a serious lack of power. Get you a good 20 mph headwind and you can forget 5th gear! All that said, I'm perfectly happy with my 4 banger and got it much cheaper than a equal year and shape I6 would have run me.
I'll agree with all that... It's simply not a great highway vehicle especially if it's windy out! But it'll get you there
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Old 05-11-2011, 09:29 AM   #23
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Well the engines do make a difference as far as power and torque where the 4.0 l6 has around 190 horses with about 235 lbs of torque and the l4 has around 120 horses with a measly 139 lbs of torque. They ads both equally reliable with l4 being slightly longer lasting. I guess I'd say it's all about how your gonna drive it and IF you know how to drive it. But if it's a 4 door or an automatic, you are a fool.
The 2.5 is NOT longer lasting than any 4.0. As a jeep builder and dismantler I can tell you that the 4 cylinder is not even half as reliable. They have a problem with the number 2 cylinder and will blow a rod outside of the block in an instant. Just to tell you how unreliable they are, I can sell a good running one in less than a week, and a 4.0 might take 6 months.
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Old 05-11-2011, 10:08 AM   #24
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My 2.5L YJ was a great vehicle on the trails. It didn't have huge tires but the 30x9.50 were bigger than the small stock ones. I did not re-gear and I fought it on the highways routinely when I was in Tennessee. When I was in a flat state like Florida, I had zero problems maintaining speed, but thru the mountains, highway speeds were out of the question.

I now own a 4.0L and I like the available power. My 4.0L is also great on the trails. The biggest difference is when I drive thru the mountiains, I no longer have problems maintaining highway speeds. If I would have re-geared my YJ, I probably would not have had problems there either.

Just my opinions.
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Old 05-11-2011, 10:51 AM   #25
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I love my 4 banger! I had both the 4.0 and the 2.5 and the only real difference is with towing and top end speed. I didn't buy a jeep to tow things and I don't care about doing more than 80 mph on the highway, its a jeep not a race car. With a 2.5 manual, regearing is not a deal breaker since it's already geared at 4.11. If you get the 4.0 and you want decent sized off road tires, be prepared to spend an extra $1500 getting it regeared
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Old 05-11-2011, 10:55 AM   #26
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Or, you could spend 500 and get a set of axles out of a 4 banger for your 4.0
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Old 05-11-2011, 11:03 AM   #27
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I know I'll be selling mine in 9 months or so! Lol
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Old 05-11-2011, 12:30 PM   #28
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Quote:
Originally Posted by Ibuildembig View Post
The 2.5 is NOT longer lasting than any 4.0. As a jeep builder and dismantler I can tell you that the 4 cylinder is not even half as reliable. They have a problem with the number 2 cylinder and will blow a rod outside of the block in an instant. Just to tell you how unreliable they are, I can sell a good running one in less than a week, and a 4.0 might take 6 months.
It makes sense. The 2.5L has a lot more work to do, which just causes that much more wear. In terms of design, the 4.0L and the 2.5L are incredibly similar (I know you know that already...lol). My YJ would sit at about 3.2k rpms at 65 mph with a 3 speed auto. My new to me TJ will cruise at 65 at 1900 rpms. That's substantial difference, which would create large amounts of wear. Also, I don't have to keep my foot to the floor in the 4.0. To keep 65, I'd have to keep my foot in it most of the time in the 2.5L
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Old 05-11-2011, 03:18 PM   #29
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I put $2000 on my 4 banger with 27,000 miles (that's not a typo) and the new owner informed me it blew up a week later. With 27k miles on it.
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Old 05-11-2011, 03:19 PM   #30
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I put $2000 on my 4 banger with 27,000 miles (that's not a typo) and the new owner informed me it blew up a week later. With 27k miles on it.
Yeah but that's a fluke how many 2.5s do you come across that are near 200k? I'd say quite a few!

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