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Old 09-24-2008, 11:58 AM   #1
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318 conversion

Hey guys,

Im considering dropping a Chrysler 318 in my 2000 TJ, due to the power constraints of the 4.0 strait 6 turning my 35 X-treme mud terrains. I realize what Im getting myself into.....Does anyone know of a conversion kit ready to go, or am I gonna have bite the bullet and piece it together myself?

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Old 09-24-2008, 12:00 PM   #2
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Also, Im running front and rear dana 44 axels, i have an ox locker in the rear, do I need to upgrade to a dana 60 to handle the increased power? I hope not, that would put me beyond my funds, do you guys think that 44 will break?

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Old 09-24-2008, 12:55 PM   #3
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44 can handle a v8. Just wondering what gears are you running, as I had 35's w/60's front and rear and did just fine with the 4.0L, w/4.56's
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Old 09-24-2008, 01:29 PM   #4
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The 318 is no power breathing monster, not a great leap forward from the 4.0 either and no where near as reliable, you need to regear.
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Old 09-24-2008, 02:10 PM   #5
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Well, if you do decide to swap out your 4.0, I'll take it!
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Old 09-24-2008, 02:12 PM   #6
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x2 - many guys here run 35's and are running the 4.0. Have you considered re-grearing? It's way cheaper than changing everything over.
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Old 09-24-2008, 03:56 PM   #7
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simply regear, your wont be how reliable the 4.0 is, put in some 4.56's i run them with my 33's and do just fine
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Old 09-24-2008, 04:33 PM   #8
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And if you still dont feel the pull you want off road after you regear then do yourself a favor and save a lot of headache by just installing an Atlas transfer case. It will be a much easier task then swappin a 318 in and you'll get 4.3:1 t case ratio. If thats not enough torque to pull the wheels for you then Im not sure what your wheeling on. And even in that case, you can swap a trans with 1st "granny" gear in such as the sm465 or NV4500. Its all about gearing man. You can make a 4 banger spin 44's up and over the toughest obsticals with the right gearing. I would deff. think about the other options before doing such a labor intensive swap.
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Old 09-24-2008, 04:39 PM   #9
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has anyone thought about gearing??
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Old 09-24-2008, 04:42 PM   #10
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maybe you might consider regearing...just an option
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Old 09-24-2008, 04:49 PM   #11
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or.....this just hit me, maybe he could consider regearing.......naw, that would never work.
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Old 09-24-2008, 04:53 PM   #12
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sorry it doesnt take much this late in the day at work
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Old 09-24-2008, 05:57 PM   #13
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regearing

Yeah guys, I already did a gear reduction, still having power issues on nasty hill climbs....The 4.0 has over 150k on it I was thinking a little more power with the 318....Everyone seems to think thats a bad idea, maybe I should just have the stock In-line six bored and stroked at a shop instead??
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Old 09-24-2008, 05:59 PM   #14
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You can go up to a 4.9L from a couple of sources, it's mostly a drop in but you need a few other things like adjustable map sensor, etc. Honestly the 318 and 360 are not that good of a motor for offroading, they have a few issues that can get very expensive.
That 4x4 show on Spike did a hemi conversion on a TJ, pretty much a drop in when you buy the kit that has the harness, motor mounts and ECU, you just need to supply the engine and tranny.
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Old 09-24-2008, 10:09 PM   #15
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what gears are you running I have 4.56 with the 4.0 and no problems turning the 35" tires I can even sqeal my tires
we have a very steep hill out here on the hwy between vegas and here I can maintain 65 all the way up
there are alot of cars that cant do 65 up that hill

A friend bought a 4.0 from me with 250,000 on it she is turning 42's with that motor

if I was going to put a V8 in my jeep it would be the hemi but I would be changing axles to
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Old 09-24-2008, 11:38 PM   #16
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X2 on a hemi if it was a V8 of any kind since all the stuff is out there to make it an easy swap. But the axle will really need to be swapped for sure for that. If you really still want more power than jsut stroke your 4.0L. You can build it into a 5.0L with some extensive work and a LOT of money or you can build it into a 4.6L for about $2K. That should give you the power and torque you want and still be less work that swapping a 318. There is plenty of info on strokers but the basic formula is that you'll want a 258 crank and rods, new pistons (.030 over usually but .060 if you want it even a little bigger), port and polished head, 26 lb. injectors, high volume oil pump, etc. you'll see once you start lookin around.
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Old 09-25-2008, 11:06 AM   #17
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Go for the 318, great motors and tons more power than the 4.0.
You could probably yank an engine and tranny out of a Grand Cherokee pretty cheap and then fab the rest if you know what you're doing.





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Old 09-25-2008, 11:41 AM   #18
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But why would you go through any fabing at all when you could just stroke a 4.0L and make it more powerful than a 318 anyway. Not to mention it is more reliable than a 318. Granted, they are good motors and they do produce fairly good power but a 4.7L stroker is way more torquey than a V8 and makes more power.
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Old 09-25-2008, 12:05 PM   #19
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Quote:
But why would you go through any fabing at all when you could just stroke a 4.0L and make it more powerful than a 318 anyway.
A couple reasons.
First and foremost, price. I can run down to the local pull n save and get a 318 and tranny out of wrecked ZJ for a couple hundred bucks. How much do you imagine it'll cost to build a stroker?
Second, Torque isn't the problem. While strong in the low end the 4.0 is pathetically weak at highway speeds and even built up I guarantee I can get more top end power out of a 318.
Reliability? how many 318's have you blown?
We had a 70 challenger with a 318 when i was in high school, we beat the living shit out a that thing and it never skipped a beat.
Probably the most important reason though, not many people do it, why be normal?
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Old 09-25-2008, 12:11 PM   #20
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i like the 318, if i wasn't building the stroker i'd do 318. building the stroker would be cheaper though, it falls right in just like the stock motor, no mods. only extra cost is fuel injectors, and a couple odds and ends, otherwise it is the same as replacing stock 4.0

318 is just as reliable as the 350, i'd do 318 before the 350, just cuz i like the way its built better.
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Old 09-25-2008, 02:41 PM   #21
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A couple reasons.
First and foremost, price. I can run down to the local pull n save and get a 318 and tranny out of wrecked ZJ for a couple hundred bucks. How much do you imagine it'll cost to build a stroker?
Second, Torque isn't the problem. While strong in the low end the 4.0 is pathetically weak at highway speeds and even built up I guarantee I can get more top end power out of a 318.
Reliability? how many 318's have you blown?
We had a 70 challenger with a 318 when i was in high school, we beat the living shit out a that thing and it never skipped a beat.
Probably the most important reason though, not many people do it, why be normal?
That 318 from the 70's is not even comparable to the ones from the 90's. They lightened that castings to reduce weight, same with the 360's, head over to the ZJ forum and take a gander at the intake problems they have.
If no stroker 4.0 I'd look at a diesel conversion, issue will be your state motor vehicle dept and emissions though.
As for going that route to the V8, other than mounts you could probably use a harness from the ZJ, same year, should have same sensors, however if you want a stick shift then you will need to us a ecu from a XJ w/5 speed, when I added my keyfob to my 97ZJ the ecu identified it self to the chrysler scan tool as an XJ ECU, not a ZJ which I found interesting and as they acutally did make ZJ's with manual trannies for 2 years is a possibility.
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Old 09-25-2008, 05:48 PM   #22
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I dont think strokers are all that normal. Its not like they are under the hood of every other TJ. As far as blowing the 318, I have never blown any engine at all. Engines usually only blow if your a complete dumb ass and YOUR doing something wrong. I didnt say it would blow, I said that IMO a 4.0L is more RELIABLE than a 318. What you should have asked me was how many 318's have I seen that have the same amoutn of miles as a 4.0L and are still going jsut as strong. My answer to that would be very few. Im not trying to tell him not to do a 318 but I do know it will be easier for him to do a stroker. And once you factore in all the fab to get it to work, your still petty close in price. In all honesty, do whatever you think would make you happy. Its your Jeep and I do think a 318 would be pretty sweet.
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Old 09-25-2008, 06:44 PM   #23
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I dont think strokers are all that normal. Its not like they are under the hood of every other TJ. As far as blowing the 318, I have never blown any engine at all. Engines usually only blow if your a complete dumb ass and YOUR doing something wrong. I didnt say it would blow, I said that IMO a 4.0L is more RELIABLE than a 318. What you should have asked me was how many 318's have I seen that have the same amoutn of miles as a 4.0L and are still going jsut as strong. My answer to that would be very few. Im not trying to tell him not to do a 318 but I do know it will be easier for him to do a stroker. And once you factore in all the fab to get it to work, your still petty close in price. In all honesty, do whatever you think would make you happy. Its your Jeep and I do think a 318 would be pretty sweet.
To me the weakness of the V8 is almost exclusively linked to the trannies and transfer cases they used in the ZJ's, once they get up there in years and mileage the cost of a reman tranny costs more than a reman engine. I had my XJ done with a jasper, cost $2700, w/labor and out the door, had the trans done in my wifes oldsmobile cutlass with a jasper reman tranny, $3500 out the door, I also had that engine replaced 4 years before and it was about $2200 so to me the trannies are alot more expensive. Our 97ZJ runs great, 4.0, auto, 242, trannie was 1.5 pints low and howled like a banshee when it was cold out so they are a lot more sensitive.
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Old 09-25-2008, 07:37 PM   #24
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Yea, I owned a ZJ with a 4.0L for a few years (my first vehicle actually) and I loved that thing. Your lucky with that 242, I had a 249 in mine. I never had to deal with changeing the viscous coupler like everyone with a 249 seems to have to do eventually but I was still always in fear that it was gonna go bad any day. Plus it sucked having to be in 4wd ALL the time. I mean it would have been nice to spin em' in 2 every once in a whileI know what your sayin with the cost of that stuff too, deff. not worth it imo. There are stronger and much better transmissions that you can get AND adapt for the same cost of the stock units.
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Old 09-25-2008, 07:45 PM   #25
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they put a Hemi in a tj, so why not., also, think about regearing?

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