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Topic Review (Newest First)
09-27-2013 10:33 AM
Tom95YJ I have owned 2 2.5l powered Wranglers and now a 4.2L wrangler. The 2.5 is a great little workhorse but when it comes to power there is no replacement for displacement ! I'll admit when I was looking for another YJ. I looked at 4 bangers and 6's. I got a 6 since it was a cleaner Jeep and better price.

Both of my previous Wranglers had 4.88's and 33-35" tires. My TJ the engine spit a piston through the block at 83k miles. It was replaced with a junkyard block and 505 performance stroker kit. It really woke it up however the tranny didn't like the extra power and it went kaput 3 weeks later. But it still did not have the low end power of my 4.2l. On the hiway the 4.2 does get to speed better and I will say my XJ will walk away from the YJ on the hiway but getting to hiway speeds the XJ and 4.2 YJ are about the same.
09-26-2013 08:54 PM
sgpd1sam As I've said before, my 97 2.5 manual won't go anywhere fast, but it will go anywhere. I, too, have thought about moving up but when my only criticism is "it isn't fast enough", I catch myself. It's not my regular DD. I don't care about fancy interiors and fancy switches and knobs. I drive it because it's fun. It may take me longer to get "there" but if I'm on a schedule I just leave early. It's pretty much stock except for 32's and a small body lift. I've accidentally wandered onto some "more difficult" stuff that may have even been black diamond material and lived to tell about it. For me, it's just fine. As another person posted, we're both old and slow so as long as it gets me there and back it's all good. I know this will earn me scorn as a Jeep owner, but...<ahem>...I have other things to spend my money on <don't hate me>.
06-22-2013 08:59 PM
MightBeDJ when i first got my 2.5 without the lift and 33x12.5's it wasnt bad at all but after i mean i cant go over 50 unless going down hill or up hill without being in first, but in the woods she can do anything. but if you want to go fast buy a bike for the road?
06-22-2013 08:38 PM
tomjeep YEEEEEEEEEEEEEEEEEEEEEEEEHAAAAAAAAAAAAAAAAAAAAAAAA AAAAAWWWWWWWWWWWWWWWWWWWWWW Express is comin' in swingin again boys!
06-20-2013 11:00 AM
Xpress
Quote:
Originally Posted by Ibuildembig View Post
Im not pretending anything paco, proof is in the pudding. Why do you think the 2.5 motors are worth twice what a 4.0 is? Prolly cause the cores are more money, because a broken block isn't fixable Trust me, I love the 2.5 jeeps, they put food on my kids table....but as far as them being a good purchase to drive and keep? Not a chance. And its not 11 2.5's, just 11 broken ones out of the 25 or so I have had.
Just because you have an opinion on the 2.5L does not make it a fact. There are MILLIONS of 2.5L Jeeps still on the road today, and that is a fact you cannot deny.
06-19-2013 04:36 PM
petercass88 2.5l on 33's and I love it! Its fun to play the drafting game on the highway to break 70 MPH. (No, I do not have a death wish - handles like a dream on the highway!)
06-19-2013 11:10 AM
greenknight yeah I drive a 2.5 with a auto
its a lug after first gear
06-19-2013 10:41 AM
Ibuildembig
Quote:
Originally Posted by Xpress View Post
Sounds more like you are just looking for excuses to flame the 2.5L. You cannot deny its robustness. For the 11 2.5L's you've seen, you've missed out on the millions of other ones you have not. Stop pretending like you know the 2.5L is garbage. There's more than a handful of locals rolling with the 2.5L with well over 200K on the clock.

Internet heresy goes a long way. I've heard several 4.0's that were knocking, one was trashed and spitting oil, going to the junkyard I've seen 4.0's with rods out the side (far too many to count), 4.0's with cracked blocks, scarred pistons, and one even had a head that was split right in 2.



Hell no, not for $800. You live in Misery, I live in Communist California, prices are hella high brah.
Im not pretending anything paco, proof is in the pudding. Why do you think the 2.5 motors are worth twice what a 4.0 is? Prolly cause the cores are more money, because a broken block isn't fixable Trust me, I love the 2.5 jeeps, they put food on my kids table....but as far as them being a good purchase to drive and keep? Not a chance. And its not 11 2.5's, just 11 broken ones out of the 25 or so I have had.
06-19-2013 10:17 AM
Xpress
Quote:
Originally Posted by Keymo View Post
I've driven a 2.5L TJ, and a JK with their 3.8L and they both were a totally different experience for me - hated how sluggish they seemed... (Granted they were both automatics and my YJ is a manual - don't know if that makes much of a difference or not...)
The automagic slushbox kills it. I've driven enough auto and manual 2.5/4.0 TJ's and enough 3.8L auto/manual JK's to know this. Not enough gears with the auto.

And not saying the 3.8L gets better, it really doesn't, but the manual makes it bearable to drive.
06-19-2013 10:14 AM
Xpress
Quote:
Originally Posted by Ibuildembig View Post
I base my findings on the jeeps I have had over the last 4 years (52 right now). I have had one 4.0 that knocked, 7 2.5's with rods hanging out the side, 3 2.5's that had valvetrain noise, and 1 2.5 that was running perfect and blew up on me as I was driving it into town.
Sounds more like you are just looking for excuses to flame the 2.5L. You cannot deny its robustness. For the 11 2.5L's you've seen, you've missed out on the millions of other ones you have not. Stop pretending like you know the 2.5L is garbage. There's more than a handful of locals rolling with the 2.5L with well over 200K on the clock.

Internet heresy goes a long way. I've heard several 4.0's that were knocking, one was trashed and spitting oil, going to the junkyard I've seen 4.0's with rods out the side (far too many to count), 4.0's with cracked blocks, scarred pistons, and one even had a head that was split right in 2.

Quote:
LOL 5.2, you coulda done way better than that thing Xpress
Hell no, not for $800. You live in Misery, I live in Communist California, prices are hella high brah.
06-19-2013 09:37 AM
Ibuildembig I base my findings on the jeeps I have had over the last 4 years (52 right now). I have had one 4.0 that knocked, 7 2.5's with rods hanging out the side, 3 2.5's that had valvetrain noise, and 1 2.5 that was running perfect and blew up on me as I was driving it into town.

LOL 5.2, you coulda done way better than that thing Xpress
06-19-2013 07:05 AM
OverkillYJ
Quote:
Originally Posted by Ibuildembig View Post
The 6 will outlast the 4, runs circles around it, and will resell better.
I don't know about that
My friends 91 2'5 has about 230k on it with no issues at all. Still runs great actually. His 99 4.0 is going to die soon with the same mileage. All about how you maintain them
06-19-2013 06:04 AM
Keymo I don't know what y'all are sayin' about the 6cyl being slow... Haha! Maybe compared to cars at highway speeds... But I've beaten ricers off the line and past a block distance in my YJ with 33's. Plus the I6 is just about invincable.

Granted - if you already have a good 2.5L there's no sense in making the SWAP... But I'd take a 4.2L over it ANYDAY - I've driven a 2.5L TJ, and a JK with their 3.8L and they both were a totally different experience for me - hated how sluggish they seemed... (Granted they were both automatics and my YJ is a manual - don't know if that makes much of a difference or not...)
06-18-2013 11:35 PM
Xpress
Quote:
Originally Posted by Ibuildembig View Post
The 6 will outlast the 4, runs circles around it, and will resell better.
All depends on how one takes care of their engine. Same with everything, including the 4.0.

Running circles perhaps, better re-sale value depends on location and the buyer..

But my 5.2 runs circles around both the 4.0 and 2.5

Quote:
Originally Posted by YJ fanatic View Post
The 4 banger was fine in the trails. It didn't have enough power to spin the tires and lose traction. But it was terrible in the sand and dunes. The 4.0l flies up hills that the 2.5l just wouldn't climb.

My stock 2.5l got 14.5mpgs. My 4.0l with 4.10 gears and stock tires got 20. It gets 16-17 on 35s.
Sounds like your 2.5L was neglected badly, as was mine. Mine had more than enough power to lay down 11's on the tarmac for a decent distance if I tried to, and I never had any issue whatsoever breaking the rubber loose offroad, doing donuts, slides, etc.
06-18-2013 10:57 PM
YJ fanatic I always thought my 2.5l was pretty good off-road, but I did the 4.0l swap and wow, what a difference. The 4.0l will do anything the 2.5l will do, and then some.

The 4 banger was fine in the trails. It didn't have enough power to spin the tires and lose traction. But it was terrible in the sand and dunes. The 4.0l flies up hills that the 2.5l just wouldn't climb.

My stock 2.5l got 14.5mpgs. My 4.0l with 4.10 gears and stock tires got 20. It gets 16-17 on 35s.
06-18-2013 10:35 PM
Ibuildembig The 6 will outlast the 4, runs circles around it, and will resell better.
06-18-2013 09:55 PM
Xpress Only advantage the 6 cylinder has over the 4 cylinder is that the 6 cylinder is a 6 cylinder whereas the 4 cylinder is a 4 cylinder
06-18-2013 07:59 PM
OverkillYJ
Quote:
Originally Posted by Drix View Post

This, I knew I wanted v8 so I did pick up a 4 cyl. Off road you won't have any power issues with a 4cly. Its all about gearing.
Oh I have no power issues offroad. Lol. I have spent a few hundred hours in the woods with this jeep. Probably more.
06-18-2013 07:52 PM
Drix
Quote:
Originally Posted by OverkillYJ View Post
You can stick an AX15 into a 2.5 without any big problems. I did it to mine. Was some work, but now I beat the living crap out of it without worries. As far as the trails, I got 33's, am locked front and back, and my buddies cant keep up with thier 4.0's. When you are in 4X4 low you can do anything you want. I can also tell you I do know someone who swapped a 4.0 into the 2.5 and said there was no way in hell they would ever do it again. Was way too much time and money for a small gain. I have a couple hundred hours in my Jeep with a 2.5, and would do it all again. I just haven't done much with the engine.

As far as a V8 being too much power, sounds like some people need driving lessons. If you drive it and build it right there is no such thing. I will be dropping in a 302 when I have the money to spend. I just bought a house with a full garage, lift, and 100 Gallon air compressor so I am getting closer to my V8.

This, I knew I wanted v8 so I did pick up a 4 cyl. Off road you won't have any power issues with a 4cly. Its all about gearing.
06-18-2013 04:11 PM
OverkillYJ
Quote:
Originally Posted by WGHyrum View Post

I agree. If you want more torque than anyone without too much horsepower while getting over 30 mpg, put in a VW TDI 1.9 and chip it for the jeep. As soon as I have a few weeks and a few grand at the same time, I am going to do this using an adapter kit from hpamotorsport.com

For now, my 2.5 is fine. My granddad's 4 banger M38 did just fine, so why wouldn't a YJ? (Actually that Willys is still running; my uncle got it in the will)
I would also like a diesel, to much extra $$$$ though.
06-18-2013 03:52 PM
WGHyrum
Quote:
Originally Posted by nwcalijeep View Post
Biggest mistake Jeep/Chrysler ever made was to get rid of the inline 6 cylinder...

4.0 will actually tow something (if that is your thing), will last forever.. of course..I'd say go with a diesel. I sold my 2.5 cj5 so I could build another tdi Jeep...

So why settle for either or, when you can have it all..fuel mileage...torque... and horsepower.
I agree. If you want more torque than anyone without too much horsepower while getting over 30 mpg, put in a VW TDI 1.9 and chip it for the jeep. As soon as I have a few weeks and a few grand at the same time, I am going to do this using an adapter kit from hpamotorsport.com

For now, my 2.5 is fine. My granddad's 4 banger M38 did just fine, so why wouldn't a YJ? (Actually that Willys is still running; my uncle got it in the will)
06-18-2013 03:39 PM
OverkillYJ You can stick an AX15 into a 2.5 without any big problems. I did it to mine. Was some work, but now I beat the living crap out of it without worries. As far as the trails, I got 33's, am locked front and back, and my buddies cant keep up with thier 4.0's. When you are in 4X4 low you can do anything you want. I can also tell you I do know someone who swapped a 4.0 into the 2.5 and said there was no way in hell they would ever do it again. Was way too much time and money for a small gain. I have a couple hundred hours in my Jeep with a 2.5, and would do it all again. I just haven't done much with the engine.

As far as a V8 being too much power, sounds like some people need driving lessons. If you drive it and build it right there is no such thing. I will be dropping in a 302 when I have the money to spend. I just bought a house with a full garage, lift, and 100 Gallon air compressor so I am getting closer to my V8.
06-18-2013 03:34 PM
Surfinglbi23 This is a common topic. The first thing to remember is that a 6 cylinder wrangler is still slow. Really slow. That helped me a lot when buying my 4 banger. I've had fast cars and wranglers are not that. If it helps, I had a TJ Sahara 6 cylinder and now have a YJ 4 cylinder and did not care for one over the other. Get the one that fits your budget and style the best.
06-18-2013 03:11 PM
RandomYJguy I never really and intended for this conversation to become a "Fuel Mileage" post.. HAHA!

I was just wondering if I put the time and effort into lifting and spending money on the 4 banger, if I would end up regretting it because I didn't go with a 4.0. Fuel Mileage doesn't bother me. I put $20 in gas every time I fill up, I don't care if I get 10miles or 35 really. lol. So guys with the 4 banger actually do have fun with their jeeps. So I would be safe to say that putting money into this vehicle wouldn't be a "waste".
06-18-2013 01:14 PM
nwcalijeep Biggest mistake Jeep/Chrysler ever made was to get rid of the inline 6 cylinder...

4.0 will actually tow something (if that is your thing), will last forever.. of course..I'd say go with a diesel. I sold my 2.5 cj5 so I could build another tdi Jeep...

So why settle for either or, when you can have it all..fuel mileage...torque... and horsepower.
06-18-2013 10:26 AM
dmcg
Quote:
Originally Posted by StanF View Post
I'm very mindful about adding weight to my Jeep, so I don't make the 2.5L work any harder. That's difficult to do, as bumpers, armor, hard tops, jerry cans, ice chests, etc, can be very heavy. .
Exactly. I commute frequently from Dallas to Austin Texas for work and there were times with my 2.5 loaded with all my gear and a strong head wind on the highway, that I had to keep it in 3rd gear just to maintain 50 mph. The 2.5 made a 3hour drive into a 4.5 hour drive and I would have to refuel half way there. I never have to refuel on this trip with my current 4.0. The 4.0 engine and ax15 transmission are simply stronger and more efficient. I used to constantly defend the 2.5 engine on the TJ forum when I had it, but honestly I'll take my 4.0 YJ over my former 2.5 TJ any day, that includes the suspension as well
06-18-2013 10:21 AM
wasomma AX5 is an inferior transmission to the AX15, so much so that it almost justifies the 4.0 over the 2.5 by itself.

Get the 6 cylinder, I get about 19-20mpg when I am not wheeling, plus it's the legendary inline 6
06-18-2013 08:04 AM
StanF I've got the 4cyl and agree that it has enough power on the trails. After a mild suspension lift, 1" body lift and 32" tires, it's not as good on the highway especially up hills or into the wind. I'm very mindful about adding weight to my Jeep, so I don't make the 2.5L work any harder. That's difficult to do, as bumpers, armor, hard tops, jerry cans, ice chests, etc, can be very heavy. At this point, my Jeep is about as light as you could make it. Running the AC also takes quite a bit of power out of the 2.5L. I'd definitely prefer the 4.0L, so I had a little more reserve HP.

I've NEVER heard anyone say they regretted getting the 4.0L and wanted the 2.5L.

I know of MANY people with the 2.5L who did engine swaps or wish they had the 4.0L.
06-18-2013 07:19 AM
Scott-CJ8
Quote:
Originally Posted by O_M_Jeep View Post
I used to think all the time about swaps and more power, then I started to realize that when all the guys with V-8s and 4.2s and 4.0s were trying to climb slickrock, they just spin and spin and spin, too much horsepower I guess, or not enough throttle finesse, either way it's always a ton of fun to go putt-putt-putting right on past them and on up the climb.
I wheeled once on a Jeep Jamboree with a guy who had a CJ-5, all rebuilt and pretty with a 360 V-8 and all-terrain 33's .... every time he 'punched' it to go up a hill, the Jeep broke loose and slid sideways. We pulled him thru everything because he had (I can't believe I'm saying it ) too much torque and no skinny pedal control.
A 4-cylinder in good condition will do just fine on the trail and on the road. It's just a different style of driving.
06-18-2013 12:08 AM
Drix
Quote:
Originally Posted by YJ fanatic View Post
Hey, my F-350 with the 7.3l diesel gets 20mpg all day. I would love for my jeep to get that.
Same here on my 02 f350. And I had 350 HP at the wheels also.
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