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Unread 08-27-2011, 07:16 PM   #16
Wrangler11
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wow guys get back on topic...

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Unread 08-27-2011, 10:11 PM   #17
Wrangler11
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Anywho... I am really considering doing this. I think I will go with the 2.5L for the time being and than eventually will swap to a larger engine. From what I've read the 2.5L is very capable off road.
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Unread 08-28-2011, 08:21 AM   #18
raynmaker
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If your gearing and tire size is right the 2.5 is fine. Did you get to look at it yet?
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Unread 08-28-2011, 10:27 AM   #19
tommbstone
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Quote:
Originally Posted by Tom95YJ View Post
Your funny this is the biggest load of crap I've seen in a good while on here !

A 4.2l being more powerful than a 4.0l

Let's look at the spec's of the 2 engines.

4.0L 190 hp and 225 lb·ft
4.2L 112HP and 210 lb.ft



I'm not the best person at math but I see a 78hp & 15lb.ft difference #'s dont lie
BTW you seem like an ***. Do you have many friends?

Dude read what I'm saying, what ever your power numbers say my best friend has the 4.0 HO 91 its gutless. It has the cool air, exhaust, chip etc and he CAN NOT keep up with me going up the 4 lane to shaver lake, he can't keep up on the free way where its flat. NOTHING I've drove his jeep he has drove mine a thousand times and we both agree my carbed 89 has a ton more power. Your numbers mean nothing to me since I've also raced other jeeps in our wheeling group with 4.0 HO's ... same results they all scratch their heads in wounder about my old 89.

Ok so lets be fair I have a fresher engine, mild cam, headers, electric fan etc no giant *** front bumper with winch and maybe my tires are 10-20 lbs lighter that could be the difference. Dem be my facts. soooo want to race?
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Unread 08-28-2011, 10:29 AM   #20
tommbstone
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Quote:
Originally Posted by Wrangler11 View Post
Anywho... I am really considering doing this. I think I will go with the 2.5L for the time being and than eventually will swap to a larger engine. From what I've read the 2.5L is very capable off road.
You could always go with an LS1, great gas milage and more power than you'll ever need.
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Unread 08-28-2011, 11:52 AM   #21
Wrangler11
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Quote:
Originally Posted by tommbstone View Post
You could always go with an LS1, great gas milage and more power than you'll ever need.
Really? Come on now.... The first thing I said was I did not want a project. I also never said I was worried about power.
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Unread 08-28-2011, 11:54 AM   #22
Wrangler11
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Quote:
Originally Posted by raynmaker View Post
If your gearing and tire size is right the 2.5 is fine. Did you get to look at it yet?
Not yet. He did show me a bunch of pictures. It looks really nice. I would rent a trailer and go look at at it. I don't want to drive out there and not bring it back if I like it.
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Unread 08-28-2011, 12:30 PM   #23
jhumphrey
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Quote:
Originally Posted by raynmaker View Post
2.5L I4 TBI (fuel injected) - 121 hp @ 5000 rpm, 135 ftlb @ 3500 rpm - used in '87-'90
2.5L I4 MPI (multi-port injection) - 130 hp @ 5250 rpm, 139 ft lb @ 3250 rpm - used in '91-'95

4.2L I6 Carburated AMC 258 - 112 hp @ 3200 rpm, 210 ft lb @ 2000 - used in '87-'90
4.0L I6 MPI AMC 242 "Power Tech HO" (High Output) - 190 hp @ 4750 rpm, 220 ft lb @ 4,000 rpm - used in '91-'95


Please not 2.5 139 ft lb at 2000 4.2 210 ft lb @ 2000
Quote:
Originally Posted by Tom95YJ View Post
Your funny this is the biggest load of crap I've seen in a good while on here !

A 4.2l being more powerful than a 4.0l

Let's look at the spec's of the 2 engines.

4.0L 190 hp and 225 lb·ft
4.2L 112HP and 210 lb.ft



I'm not the best person at math but I see a 78hp & 15lb.ft difference #'s dont lie
I hate to stray from the OP topic, but I have to chime in about this 4.0 vs. 4.2 thing. Look at the RPM's to reach that torque on the 4.0: 4,000 vs the 4.2's 2,000. This is why people do the 4.0 head swap and keep the 4.2 "lower" block. That way, they get the best of both worlds (the HP of the 4.0 and the torque of the 4.2).

The 4.2's engine is less complicated, hailing from its father, the CJ7. Really all they did was add emissions crap to satisfy the EPA when they made the YJ, which robbed it of a lot of its power. It wasnt until the 4.0 came along that they had refined this process and got better specs, but at much higher RPMs. For those that have altered their rigs, they have seen a much better increase in HP and torque as well. But, comparing a 2.5 to a 4.0/4.2 is apples and oranges.

Rounding back to what the OP asked about, since he has to replace the 2.5 engine in a 1989 model jeep, he could easily:

a) put another 2.5 in. This is not the popular answer, as most of us would agree that putting in a 4.0/4.2 is a better solution. Especially if he was going to dd this jeep, as the 6cyl is the best of both on and off road worlds.

b) choose to put in the 4.0 OR 4.2. This would allow him to get the best of both worlds, but the "which engine is better" debate isnt going to help. The 4.0, while a great engine, has more computer control than the 4.2 does.

For someone who doesnt want to get into a huge project (as the OP has stated), putting a replacement 2.5 is the way to go. It will be a direct swap and he doesnt have to worry about a new wiring harness, computer, bellhousing, tranny, etc. He can just put the 2.5 in and go.
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Unread 08-28-2011, 03:34 PM   #24
Wrangler11
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Why don't you guys create a 4.0 vs 4.2 thread...
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Unread 08-28-2011, 03:36 PM   #25
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Here are a couple of pictures.







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Unread 08-28-2011, 03:37 PM   #26
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Unread 08-28-2011, 03:53 PM   #27
oldtime_ironman
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Not sure I would trade the car for it. It's in OK shape, not fantastic. But the car is probably worth far more than the Jeep is at this point. Yes a 2.5 is a very easy swap, you can find them on craiglist pretty cheap and probably so it in a weekend.
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Unread 08-28-2011, 04:35 PM   #28
jhumphrey
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Did you take these photos or were they sent to you?

The reason I ask is because you should have the carpet pulled up and see what the tub looks like. The body looks in ok condition, but I do see some cancer spots. I also see some wires hanging out from under the stereo...that could be a bad sign. I never trust wiring, especially when someone did it themselves.

Under carriage looks a little rough as well. Personally, Id keep my acura and find someone else to trade with, to questionable for my taste.
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Unread 08-28-2011, 05:37 PM   #29
Wrangler11
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The little bit of rust I am not too worried about. It's hard to find a YJ in Illinois without a little bit of rust. I think I'm going to take your guys advice and move on. I just really want another wrangler. I'd go as far as trading bother the acura and land rover for one.
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Unread 08-28-2011, 05:57 PM   #30
jhumphrey
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Quote:
Originally Posted by Wrangler11 View Post
The little bit of rust I am not too worried about. It's hard to find a YJ in Illinois without a little bit of rust. I think I'm going to take your guys advice and move on. I just really want another wrangler. I'd go as far as trading bother the acura and land rover for one.
I think that you wont regret passing on this one. There is just to many questions with it that cant be answered. If you dont mind traveling a little, KY has quite a bit of jeeps for sale on craigslist for decent prices...
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