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Old 12-19-2011, 09:37 PM   #1
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Love your 4 cylinder.

Guys.... I'm seeing so many threads about how do I make my 4 cylinder more powerful? How do I make it faster? How do I do this or that to it to make it better on the highway?

I am not going to sit here and put anyone down for it... I can understand why, owning one myself. For the longest time I tried so many different things to get it to go faster.

Now I realize that the advantage to the 4 cylinder is not one of speed... that goes without saying. The advantage to the 4 cylinder are as follows:

(Note that these are based on my own meandering experience)

1. Fuel economy. I am getting 20 to 23 mpg.
2. Simplicity of mechanism (less moving parts).
3. Supremacy of reliability.
4. Superiority of ancestry. (The venerable 4.0 L-6 was built off of the AMC 2.5 L-4 platform.... simply 2 extra cylinders).

1. I have squeezed the extra MPG out of this engine in two ways. While installing new spark plugs, I changed the gap from .035 to .033. I had hoped that the slightly smaller gap would produce a hotter spark resulting in more efficient burn of catalyst. My hopes were fulfilled. I also have changed my driving habits to upshift at 2500 RPM, or languish there on long stretches of road (even in 3rd and 4th). In combination these have increased my fuel economy significantly.

2. It is no secret that the 2.5L AMC 4 cyl has derived its reliability from the fact that it's so damn simple. The fact that it possesses a timing chain as opposed to a belt definitely aids in this.

3. A direct result of the smaller amount of moving parts is the supreme reliability. If you are in this forum you know what I am talking about.

4. The reason why the 4.0 was so reliable and popular is because before it came on the scene in 1987, the 2.8 L GM V6 was the Jeep brand's 6 cylinder power plant. It did little to aid the vehicles as they were utter garbage. The 4 cylinder, however had exponentially fewer incidence of failure. AMC's ingenious engineers decided to take what works, and leave it the same, just make it 2 cylinders longer. (The cylinders of both engines, if I am not mistaken, work out to be .6666666667 liters per cylinder). It works out perfectly.

Just my $0.02. Don't feel inadequate because your 4 cylinder Jeep is slow. If nothing else, you'll still be running when everything else on the road around you is in the junkyard.

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Old 12-19-2011, 09:39 PM   #2
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My last wrangler was an I6.. and i must say i really like my 4 cylinder better for some reason.

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Old 12-19-2011, 09:54 PM   #3
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I've had mine for 5 years and I don't have any complaints. It has been one of the most reliable vehicles I've had. I did recently replace the engine at 215k and rebuilt the rear at 220k. I love the 4 cyl it has plenty of power for what I need
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Old 12-19-2011, 10:29 PM   #4
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I love my 4 Banger...might be a little slower getting where I am going, but I don't care because that simply means it's "more quality time spent with the Jeep". If I want to smoke people off the line, I will use my Dodge diesel.
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Old 12-20-2011, 12:44 AM   #5
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Love my "4 Angry Squirrels" but I need a sticker on the back to warn drivers that its slow to help ward off tailgaters and other aggressive drivers.
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Old 12-20-2011, 01:34 AM   #6
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For the longest time i wanted to swap my 2.5 for the 4.0 for the sole purpose that it sucked so bad on the highway, didnt get great mileage, and while attempting to get better mileage i was getting pulled by hybrids lol. But in all reality, its always gonna suck on the highway, its not meant to be an everyday driver at this point. This thread makes me and my jeep feel better about ourselves
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Old 12-20-2011, 04:00 AM   #7
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Not trying to hate on the 4 banger or be "that guy" but id like to clear up some misleading statements.

The 4L was not based off the 2.5L, but rather finds its roots starting with the first modern age AMC I6 in 1964, the AMC 232 "Torque Command"

The 2.5 was based off the 4.2L design, with a larger bore and smaller stroke, and 2 less cylinders. To its credit though, the combustion chamber and port design of the cylinder head on the 2.5 was adapted to fit the 4L

The modern 4L was evolved from the 4.2, but in the case of the 2.5 it too had a larger bore and smaller stroke.
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Old 12-20-2011, 07:26 AM   #8
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Quote:
Originally Posted by Dextreme View Post
I love my 4 Banger...might be a little slower getting where I am going, but I don't care because that simply means it's "more quality time spent with the Jeep". If I want to smoke people off the line, I will use my Dodge diesel.
Same here. My Cummins don't play when you get heavy on the foot, but don't try it with the 4 banger.
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Old 12-20-2011, 07:31 AM   #9
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Jeep 4.0 liter six cylinder engine

It appears I have made an error... the 4.0 was in fact not based off the 2.5.... however it does share a ton of the same operating features. My bad. Still they are very similar.
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Old 12-20-2011, 07:32 AM   #10
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I love my 2.4 and it has kept me from a speeding ticket for years. To all those speeders going around me, what's the rush. Do you want to get to work that bad. LOL
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Old 12-20-2011, 07:55 AM   #11
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my 2.5 is fine. It's a little slow on the highway, but in 4-low with 4:88 gears, I'll go wherever a I6 or a V8 goes.
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Old 12-20-2011, 07:40 PM   #12
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Its a shame this thread hasn't seen more replies....
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Old 12-20-2011, 07:44 PM   #13
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You mentioned the 2.5 has a chain,so does the 4.0.
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Old 12-20-2011, 07:55 PM   #14
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I had a 80 Cj-5, 00 TJ, and now a 98 TJ. All were 4 cyl. Don't know it just happened.
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Old 12-20-2011, 08:33 PM   #15
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My tired 4 banger is cool until I drive my wifes 4.0, then get in mine. It's really bad if I drive them both in one day. One day, mine will get its turn in the garage! Or I will just pony up for a RUBI! What I really want.
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Old 12-20-2011, 09:05 PM   #16
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The 2.4 is fine but its no Hurricane.
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Old 12-20-2011, 09:57 PM   #17
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no complaints with my 2.4L, goes where all the 4Ls go offroad..sure its a tad slow around town..just leave for work a few minutes earlier ;] much easier to change the serp belt compared to the 4 L
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Old 12-20-2011, 10:31 PM   #18
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luv my 2.5l, 5 sp. manual,, running 31s & the 410 rear-end. it'll easily run down interstate @ 70mph, or pull my mower trailer full of firewood 45- 50mph on the backroads.. couldn't afford to feed mauy more horses anyway!
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Old 12-21-2011, 08:29 AM   #19
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Love my little mouse motor.

I get a giggle out of folks who bash them. I had a 98 Cherokee with the 4.0, and it would scoot along really well. So, when I began looking for a Wrangler, I didn't even look at the 4 cylinders. I noticed very quickly that the 4.0s were priced considerably higher. After driving a couple of 2.5s, I can honestly say that I didn't notice a huge difference in power between the 2.5 and the 4.0.
I routinely drive mine on the interstate, and it seems to run 70-80 MPH without too much trouble. It also will climb right up some really nasty dirt trails like a spider. (In stock form too!)

I've also got to say, I don't really understand the "more power!!!!" mentality. It's a Jeep. How fast do you think you have to go? Like some of these other guys have pointed out, you wanna pull a pontoon? Buy a dually. You wanna drag race? You bought the wrong thing.

There is a reason you've never heard of a Wrangler GT or a Jeep SS.

The 4.0 is great, and the newer engine is going to be a plus, but there's absolutlely nothing lacking with the 4 bangers.
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Old 12-21-2011, 08:34 AM   #20
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I seen a sticker I'll have to make for those of us with the 2.5.. It says "you can go fast... But I can go anywhere"
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Old 12-21-2011, 09:18 AM   #21
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I bought my first jeep a 97 2.5 this year in July for a DD all back roads rarely hwy. Needed some TLC but all in all very easy to work on and parts are always available. Cant get quite the fuel mileage everyone else claims, 15-18 mpg w/2" BB and 31x10.5 15's but didnt expect it to get 30 MPG either. No barn burner like my 05 Dodge 1 ton dually 5.9 but it I dont pull my 4 horse trailer with it either.
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Old 12-21-2011, 01:27 PM   #22
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Quote:
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I seen a sticker I'll have to make for those of us with the 2.5.. It says "you can go fast... But I can go anywhere"
Hahaha.... epic. When you make one lemme know.
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Old 12-23-2011, 06:21 AM   #23
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i have a 2.5 in my 98 tj and love it. i am 51 and when i was young i had all that go fast toys and still have a few.in my older years i have learned it ain't how fast you get there but, how you look when you arrive.
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Old 12-23-2011, 06:28 AM   #24
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Since I don't drive my Jeep on the freeway, the 2.5L does just fine for around town. I'm surprised it's so competent with the big tires and it does what it needs to down low. While I'd love an LS1, I can't validate either the cost of the conversion or the drop from 20MPG down to 10MPG when the only real advantage would be traveling at freeway speeds. If I want to go on the freeway, I either take my S10 or the wife's Mazda3.
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Old 12-23-2011, 06:28 AM   #25
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Hahaha.... epic. When you make one lemme know.
I would also love one of these!
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Old 12-27-2011, 09:06 AM   #26
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You'll have to tell me how long and tall you'd want the letters and what color .. I'll look to see what colors I have left but it takes ten mins to pull out my plotter and start cutting so I'll get mine going tonight and I'll post a pic .. I need to remake my h2 recovery unit sticker anyways
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Old 12-27-2011, 09:23 AM   #27
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2.5, manual, 4:10's on 31's ....fast enough for me. Lots of room to work under hood if something were to break.
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Old 12-27-2011, 10:33 AM   #28
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I'd like in on that sticker too
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Old 12-28-2011, 12:15 PM   #29
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Ok so I looked last night and I have a lot of red black and white vinyl and a few others but if u want stickers pm me with the color And saying you want and size
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Old 12-28-2011, 03:00 PM   #30
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Hearing all these good things about a 4cyl makes me happy I decided to get the 2.4L. I really havent run into a situation where I needed the power of a 4.0L so whats the point of spending 1000ks more for something just as good for me? Havent had a problem with it yet other than replacing the drive belt. I really only drive the speed limit, if I wanted to go fast I wouldnt have bought a jeep.

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