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Unread 11-23-2001, 09:56 AM   #1
RPjeepster24
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engine conversion

OK, I have a 88 jeep wrangler that I am altering into a 4wheeling machine and I got a huge lift and tires and my 2.5 litre is not pulling it the way I would like, I am interested in doing an engine conversion, I am having a hard time deciding between a 4.0 and a v8, and I don't want a huge hassle because I well be doing it myself, unless any of you guys no a way to make ausome horsepower out of a 2.5, and my budget is not exactly 10K either, any suggestions?

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Unread 12-09-2001, 04:32 PM   #2
bigsteve3184
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i have the same problem!!! I have 3in body and ordering a 4in suspension and putting 35's..I NEED MORE POWER...i'm only 17 though...and i don't have a lot of money...
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Unread 12-09-2001, 04:39 PM   #3
Brendan
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Keep in mind that if you get too much power your trannys' won't be able to take it. Niether will your axles. If you want a true wheeling machine, then go for a v8, and upgrade everything else along the way. Do it right the first time, ya know? If you just want more reliablity, and some decent power gains, go for the 4.0. The 4.0 will be an easier swap over all, and should cost less, but it doesn't really compare to a v8 in any way.
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Unread 12-10-2001, 08:00 PM   #4
jeeping18
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big tires equal loss of power, i have a 91 with a 4.0 and have put on a suspension lift and 31's and lost power i put on a borla cat back and a different intake and it has helped.
but i know a guy who put haeders and exahust on his 4 banger and said that they suck and wishes he got a bigger motor!
i have 130000 miles on my 4.0 and it runs good still but i know soon i will either rebuild it or swap for a 318 if anyone has done this let me know what they think, thanks
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Unread 12-10-2001, 09:55 PM   #5
Pantera
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regearing wouldn't be a bad idea either... With the proper gears, your 4-Banger should be able to handle about anything... Just a thought (a cheaper one, at that)...
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Unread 12-10-2001, 10:09 PM   #6
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WOW! you people think you can do miracles with a 2.5. Keep dreaming. 33's and 35's with stock gears. That is the first thing you should think about. Get gears that are more in line with the sze tires you have. 4.56's or 4.88's.
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Unread 12-10-2001, 10:30 PM   #7
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I would also agree on the gearing.

If the 2.5l isn't enough with the larger tires, look for 4.56 gears (for 33" tires) or for 4.88 gears (for 35" tires). The stock rear axle will have problems with 35" tires (may start breaking badly) .. so you might want to look for a Dana44 axle (and match the gears front and back). The stock front axle is strong enough for 35" tires

If you want beyond huge tires, then look for a full size truck to swap into your rig. A Chevy 1/2ton is fairly easy (some welding, some fabrication required) to do. I will be starting my second drive train swap soon (if finances hold out long enough). If things go well, I should be able to do it all for under $2000 Canadian.

There are many options .. what are your long term plans for your rig?
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Unread 12-11-2001, 05:24 AM   #8
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Have to disagree about the 2.5 not being enough with 33s and stock gearing (agree that you don't want to make long highway trips ), but I'm running 33 MTs with a 2.5, stock gears and a few perfomance mods.

My goal is to hit 180+ HP (stock 4.0) for less that $1000 CDN and have it dyno'ed to shut up a particularly prejudiced guy in my club... hehehe... Hitting 165 (calculated) right now and have only spent $400 CDN. Picked up a used MSD yesterday for $150 and MSD says it will give you 15 HP, soooooo... Here's hoping. Have a head and intake that I got from a scrapper for $50 that I'm going to cut, port and polish as well. Haven't done too much with the exhaust as yet, saving that in case I fall short with other stuff and I'm trying to keep it smog legal.

To summarize, if you want to have a little fun with displacement bigots, build a 2.5 that whips their butts!
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Unread 12-11-2001, 05:55 AM   #9
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I noticed a big change when I did my exhaust. I actually got 5th gear back on the highway. Next up is the intake and throttlebody spacer.

If you really want to spice things up a bit, I found some posts on JU where a guy took a supercharger out of a thunderbird and modified it to fit in his 2.5L. He says its pushing almost 300hp now. Not sure how that works in off road conditions, I guess if you set the PSI real low you can still spin it up.
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Unread 12-11-2001, 07:21 AM   #10
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AtRoPiNe


What do you mean "JU" site.. I am interested in finding what you have seen..

Thanks
If you can post the site's URL....
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Unread 12-11-2001, 12:34 PM   #11
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Unread 12-11-2001, 12:58 PM   #12
Dan Morera
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What about 4.2 with 33's and the stock gears (Peugeot)? How bad is it going to get? what if I put in 32's or 31's?

I haven't done the lift yet but I'm not going to big with it.
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Unread 12-11-2001, 03:08 PM   #13
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You should check into the vortec 4.3 chevy v-6. I understand that this is pretty much a bolt in deal except for motor mounts and wiring. You will be able to use your current transmission. I know afew guys that are using this engine in older jeeps, they produce gobbs of power. This may be the cheapest way for you to go.
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Unread 02-08-2002, 08:33 PM   #14
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Quote:
Originally posted by jerk with a jeep:
You should check into the vortec 4.3 chevy v-6. I understand that this is pretty much a bolt in deal except for motor mounts and wiring. You will be able to use your current transmission. I know afew guys that are using this engine in older jeeps, they produce gobbs of power. This may be the cheapest way for you to go.
I have a 92 wrangler with a 5sp.and a 4cyl. I have a 91 s-10 4.3ltr auto. My plan is to rebuild the 4.3 and use the tranny,and get another tcase that will work. if you have any comments or you know someone that can give me some advice and or a heads up on what else i might have to do, please give them my e-mail. I'm planning on doing this sometime next week. Any info would be appreciated. Thanks alot. Brian<bdwarner@jaspereng.com
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Unread 02-09-2002, 09:39 PM   #15
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