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Old 06-25-2012, 11:33 PM
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Time to Chose an Engine

After I wrap up my current project I am going to start acquiring the parts to swap my engine next summer. What I want to do is keep as much of the rest of my current drivetrain as possible. Every time anything has given me crap I have upgraded it knowing eventually a more powerful engine would be going in. You can see in my sig what I got. I want to be able to worry about the engine without worrying about things like fuel pump and stuff unless I have no choice. On the other hand I have heard of diesel conversions using Turbo Diesels out of Jettas, not sure how much power I would get. I know this sounds stupid, but I want more power and better fuel economy if possible since it is my DD. I actually read a while back in a post in here a guy got better gas mileage when he swapped to a V8 since it took less gas at high speed to compensate for the brick like aerodynamic features. So not sure where to start. Diesel? 4.0? V8? Magnum V6?

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Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
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Old 06-26-2012, 12:22 AM   #2
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the 4.0 would be the best for PA emissions

a small block chevy swap is pretty common, lots of info and parts available

I've heard of the mercedes diesel more often than using jettas
These guys might have more info on it:
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Old 06-26-2012, 12:42 AM   #3
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Quote:
Originally Posted by OverkillYJ
After I wrap up my current project I am going to start acquiring the parts to swap my engine next summer. What I want to do is keep as much of the rest of my current drivetrain as possible. Every time anything has given me crap I have upgraded it knowing eventually a more powerful engine would be going in. You can see in my sig what I got. I want to be able to worry about the engine without worrying about things like fuel pump and stuff unless I have no choice. On the other hand I have heard of diesel conversions using Turbo Diesels out of Jettas, not sure how much power I would get. I know this sounds stupid, but I want more power and better fuel economy if possible since it is my DD. I actually read a while back in a post in here a guy got better gas mileage when he swapped to a V8 since it took less gas at high speed to compensate for the brick like aerodynamic features. So not sure where to start. Diesel? 4.0? V8? Magnum V6?
You can build your 6 cyl I am going to bore 8 over &super charge not much more mileage but more power
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Old 06-26-2012, 08:46 AM
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What is the difference in milage anyway? I obviously didnt get a Jeep as my DD concerned too much about gas milage, but when I am buying an engine I want to put something in the is more efficient. Should I look for the 3.9 Jeep has been using for a while now? Would a 305 be bad gas milage? I am assuming the newer I go the better off I would be, but also the bigger pain in the ass the wiring would be.
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Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
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Old 06-26-2012, 10:17 AM   #5
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Some of the V6 conversions look interesting. The GM motors are pretty good on gas, don't seem as thirsty as the 4.0s.
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Old 06-26-2012, 11:39 AM
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I loved the magnum 3.9 i had in my dakota, that thing screamed. Not sure pros cons compared to a 4.0. Another attractive thing of the 3.9 is i think some might bolt to my ax15. I would assume newer always means more efficient and powerful but i dont know for sure. Some of the emissions crap on newer stuff isnt always great
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Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
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Old 06-26-2012, 12:31 PM   #7
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clutch is diff on 3.9 to 4.0 on the input shaft side, but it bolts up the same. personally the easiest swap would be a 4.0ho, but you can get anything 60 degree chevy (4.3/5.7) from jegs, mounts and such. id like to try a 6.0l LSX out of a newer tahoe myself. that would be a nice swap. and now edelbrock makes a carb intake for it with a ecm to drive the coil packs. corvette like power for sure
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Old 06-26-2012, 12:36 PM   #8
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I would personally look for a 300 size range Chevy engine to put in. A lot of Jeepers that have done the swap have reported all kinds of mileage figures, mostly good, in the low 20 range. When you're playing with that much torque you don't really need to push it hardly at all to get moving and stay moving.
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Old 06-26-2012, 12:47 PM   #9
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I am partial to the explorer v8. Its distributor is up front do you won't have tunnel clearance issues. With exhaust and cam swap a healthy one will lay down just shy of 300hp and you can snag the 8.8 rear from the same vehicle while you are at it.
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Old 06-26-2012, 04:58 PM
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Right now I get about 12mpg. Getting anything near 20 would be great. Getting more power at the same time would be great, but are those figures for new crate motors or 10 year old V8's with 100k miles on them? Are there any V8's out there though that I can bolt to an AX15 without that stupid adapter plate? I know those adapters are around $500 and I just do not want to buy that unless I somehow got a running engine for free. I want to try and keep the swap around $1000-$1500. No more than that.
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Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
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Old 06-26-2012, 05:25 PM   #11
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With that budget you likely won't make it far. Id take the money you have and do a rebuild. In all reality by the time you are done with all the little things like fasteners, fluids, adapters, etc you are going to be in it for at least 4k.
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Old 06-26-2012, 05:41 PM
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I know I can get a V6 or V8 that runs for $300-$500. It would have 100k plus and come out of a 15year old vehicle, but it would still be an upgrade and not far off the amount it would take me to beef up the 2.5. Even after beefing up the 2.5 I dont think I would want it much longer anyway. That is one of the reasons why I was considering a dakota V8 or V6. I can get one of those cheap for sure since the bodys fall off them half the time. Especially if I drive a couple hours upstate in PA to where the rust is a little worst. I guess I should Google V6 Versus Strait 6 though. For off/onroad use I dont know what makes the strait 6 so much better. I know they last longer and produce more low end torque, but beside that I am not sure. I could get a 4.0 out of a junkyard and just rebuild it. Hard to decide where to start.
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Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
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Old 06-26-2012, 08:38 PM   #13
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Im partial to the V-6 motors for power and MPG... but thats just me.

Just keep in mind, anything you choose that is not typically stock for a jeep will mean at least some creative mods, and will change your budget. Im sure lots of searches will provide you with options that you are willing to do.
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Old 06-26-2012, 08:52 PM   #14
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Been my experience that a push rod v6 in a light truck costs just as much to operate as a v8. If you're going to swap go 8.
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Old 06-26-2012, 09:03 PM   #15
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Cummins 4bt is my vote, lots of power and awesome MPG
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Old 06-26-2012, 09:21 PM   #16
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Agreex^
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Old 06-26-2012, 11:15 PM
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That would be awesome to have a cummins, diesel would be my first choice if possible. Where the hell would I find on though that doesnt cost a fortune?
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Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
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Old 06-26-2012, 11:20 PM   #18
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That would be awesome to have a cummins, diesel would be my first choice if possible. Where the hell would I find on though that doesnt cost a fortune?
thats the trick...
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Old 06-26-2012, 11:47 PM   #19
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And also finding the right transmission, tire, and gearing ratios so that you can actually drive it at highway speeds instead of rolling the rev limiter at 50mph.
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Old 06-27-2012, 03:59 AM   #20
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There is a forum dedicated to 4bt swaps, I'm sure if you join three they could help out. Most likely look for an old Frito lay truck.
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Old 06-27-2012, 06:19 AM   #21
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4bt came in bread and panel trucks. Would likely be cheaper to find a broken truck for sale than dig one out of a yard.
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Old 06-27-2012, 10:25 AM   #22
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With that budget you likely won't make it far. Id take the money you have and do a rebuild. In all reality by the time you are done with all the little things like fasteners, fluids, adapters, etc you are going to be in it for at least 4k.
Good point, make a spreadsheet with all the parts you are going to need and accurate costs for each part. Then double that figure, and you will be lucky to get under that. There is so much nickel and dimeing going on in a swap its crazy.
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Old 06-27-2012, 10:45 AM
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Good point, make a spreadsheet with all the parts you are going to need and accurate costs for each part. Then double that figure, and you will be lucky to get under that. There is so much nickel and dimeing going on in a swap its crazy.
That is why I am not jumping in and will be building this engine over the next year. Everything I have done always goes over budget.
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Complete rebuild axle/engine/everything swap in progress: Building stock width 44's with 302 from 01 Explorer. Motor has GT40p heads, Cobra Intake, and truck cam. Running A9L EEC IV stand alone engine from late 80's-90's Mustang GT. Big Bearing NP435 married to NP205.
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Old 06-27-2012, 11:42 AM   #24
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A simple refresh and light resto work on my fox body has already gone 2k over budget. I've found its best not to put a timeline or a budget on projects such as these. Buy parts as you can and DON'T throw anything away until the beast is up and running. Can't tell you how many times I needed that one harness clip or that odd bolt from the old parts I had already ripped out and disposed of.
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Old 06-27-2012, 03:16 PM
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My goal is to have this in before Halloween of 2013. That gives me time to get everything together. I might do it sooner or later depending on how everything comes along, but I def will not be doing it after Halloween. If anything goes longer than expect it will be much to cold to spend entire days outside.

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