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-   -   Engine swap advice..... PLEASE! (http://www.wranglerforum.com/f218/engine-swap-advice-please-250364.html)

superdiver 06-19-2013 10:43 AM

Engine swap advice..... PLEASE!
 
Well, i am pretty sure my 89 YJ with a 4.2 engine is now toast... I believe it threw a rod, but cant get it to the mechanics yet to verify.

Either way, lets assume the engine is either toast or needs a major overhaul....

If I wanted to swap it out and put in a different engine (one with less then 190k on it like the one i have now) what engine is easiest to swap it out with, best to swap it out with most economical ect ect ect...

Which engine would you replace it with and why? Cost not being the MAJOR factor but a consideration...

I dont race, I dont do serious off road, and I would like it to be reasonably good mileage wise...

87YJnTX 06-19-2013 11:03 AM

sounds like go with a rebuild. Adapters will have to be purchased for most if not all other motors. It can get quite exspensive.

other considerations is what kind of driving you are doing, alot of highway ? long run times may be best to go diesel. Diesel is not to good for alot of in town/ short runs though. Tire size ? how much lift ? plan on going higher ?

BCDonny 06-19-2013 11:16 AM

I would just replace or rebuild the 4.2 and use a good carb (motorcraft 2150) and a HEI dizzy, you will be more than happy with it.

superdiver 06-19-2013 11:44 AM

I drive mostly in town and short mileage. My off road is at most decent logging roads. I dont have "big" tires yet, and at most I would want to use 33 that are wide. It is NOT lifted but has good springs.

another consideration is that the frame does have rust as I live on the ocean in a rain forest. At what point is it a scrapper?

NFGZ 06-19-2013 01:25 PM

Good gas mileage? Do the mercedes turbo diesel swap. Its dirt cheap pretty much bolt in, and people swear they get 28 mpg with it.

87YJnTX 06-19-2013 04:58 PM

where to get the adapters etc for the mercedes ? probly be more power than the VW diesel

petercass88 06-19-2013 05:19 PM

Would a benz turbo diesel give you plenty of torque to spin 35" tires with 4.88 gears in the diffs? My dad has a VW TDi and it is a sweet motor, when my 4 banger dies I would love to do a turbo diesel swap!

OverkillYJ 06-19-2013 08:34 PM

Benz or 4BT are ideal, but they cost a whole lot of money before you are done. I would expect 3000-4000 too do one of those. More if you get a low mileage engine.

Cashcrazy 06-19-2013 09:09 PM

Cost not a factor I personally would do a GM 4.3 swap with fuel injection. But if cost and ease was considered I would rebuild the 4.2, add a 4.0 head, motorcraft 2100, and TFI ignition.

OverkillYJ 06-19-2013 09:19 PM

Quote:

Originally Posted by Cashcrazy (Post 3879411)
Cost not a factor I personally would do a GM 4.3 swap with fuel injection. But if cost and ease was considered I would rebuild the 4.2, add a 4.0 head, motorcraft 2100, and TFI ignition.

Jeeps are all about torque. Diesel wins. Strait motors win unless you are putting in a V8.

Ibuildembig 06-19-2013 09:38 PM

X2

c5wagner 06-20-2013 12:23 AM

I did a 5.3l l59 chevy swap about 2 years ago, but had to put my 4.2l back in for california smog nazis to be happy. I got everything to do it for just under $2000, so as you can imagine I was mad when I heard the phrase: your engine is not an available option for your vehicle make....

OverkillYJ 06-20-2013 08:00 AM

What is the rule of thumb with that? Do emissions go on the engines that were supposed to be available for your vehicle in all states? If you put in a diesel or a V8 how does that work? I am in PA, not the worst state, but we do have emission testing here.

c5wagner 06-20-2013 06:57 PM

I failed because of the visual inspection aspect of california smog. I went to the smog referee, and he told me that I couldn't have a chevy engine in a jeep because that chevy engine was not an "available factory option for my vehicle make." I don't know the exact rules for your state so try calling a smog referee for your county and learn the rules. As for the swap, it is very easy so don't feel overwhelmed. The chevy engine really is self sufficient and not difficult to adapt. You may need after market gauges, an inline fuel pump with the correct psi for whatever engine you choose, and all the other little basics.

c5wagner 06-20-2013 07:23 PM

Oh and after doing a few yj engine swaps (on my friends jeeps registered in arizona), I have found the chevy 350 TBI to be the most easily accomplished swap

Ibuildembig 06-20-2013 07:31 PM

It all depends who you are and what you know the most about. To me, a ford or dodge is just as easy.

AZ WRANGLER 06-20-2013 08:25 PM

I did a Chevy 5.3 about a year ago and love it! Get ready to spend some money! My jeep had the weak 2.5 in it. If it would have had the 4.2 in it I would have kept it that way. That is a good motor. You should get a rebuilt 4.2 with the stroker kit. Probably the most bang for your buck and easiest swap.

BDK 06-20-2013 08:44 PM

Get a 4.0 head and manifold some borla headers and a computer and harness out of XJ and switch your 4.2 to FI.

Now if your frame is rusty (holes not surface) you might just want to look at a newer Jeep

c5wagner 06-22-2013 05:50 PM

Quote:

Originally Posted by BDK (Post 3883644)
Get a 4.0 head and manifold some borla headers and a computer and harness out of XJ and switch your 4.2 to FI.

Is this all you have to do to make a 4.2 FI? Because I have a pulled 4.0 from a 93 cherokee that has a cracked block, but the head, manifold, computer, and harness are all good. I can also get a good inline fuel pump.

superdiver 06-26-2013 10:40 AM

took the jeep to my mechanic yesterday. He is going to put together some numbers for three different options... a 4.2 replace, a V6 Chev and a straight 5 cylinder Mercedes diesel.

We figure the 4.2 will be the cheapest and easiest, but we want to see how much cheaper...

OverkillYJ 06-26-2013 02:47 PM

Quote:

Originally Posted by superdiver (Post 3901135)
took the jeep to my mechanic yesterday. He is going to put together some numbers for three different options... a 4.2 replace, a V6 Chev and a straight 5 cylinder Mercedes diesel.

We figure the 4.2 will be the cheapest and easiest, but we want to see how much cheaper...

That sounds awesome man. I am more curious about the diesel than anything. I have accepted that converting to a diesel would cost me so much more than swapping in a 302 that I have scrubbed the idea and hope to start on my V8 within the next 6 months.

I cant find a 4BT in good shape at a decent price, and it seems the Mercedes route costs quite a bit more than anything gas. The 4BT quote I got just for the hell of it started at 10k, even though I would do it myself I wanted to see what they were going to charge me for.

WGHyrum 06-26-2013 04:09 PM

For the diesel, you can get a simple bellhousing adapter and motor mounts made. If you're now up for that, check out
http://www.mercedesdiesel4x4.com/Default.asp

OverkillYJ 06-26-2013 04:55 PM

Quote:

Originally Posted by WGHyrum (Post 3902157)
For the diesel, you can get a simple bellhousing adapter and motor mounts made. If you're now up for that, check out
Mercedes Diesel 4x4.com OM617 Jeep Conversion Kits

Yeah I already looked at all that site. I can get a 302 under 100k miles for $500. Too big a price difference.

WGHyrum 06-27-2013 06:05 AM

Okay. It's worth it for me for the torque and ability to run WVO. A bit more money on an engine and a friendship with a restaurant owner can equal free fuel? I'm in.
Also since the average cared for OM617 gets upwards of 600k miles on it, with some reaching the 1 million mark without being rebuilt? Worth the money to me.

OverkillYJ 06-27-2013 07:16 AM

Quote:

Originally Posted by WGHyrum (Post 3903943)
Okay. It's worth it for me for the torque and ability to run WVO. A bit more money on an engine and a friendship with a restaurant owner can equal free fuel? I'm in.
Also since the average cared for OM617 gets upwards of 600k miles on it, with some reaching the 1 million mark without being rebuilt? Worth the money to me.

Yeah well a 302 has about 300 lbs of torque stock. I have a ton of aftermarket options easily available if I decide to I build it, and if I kill it they are cheap and plentiful. Once I put in the first it is a direct swap to replace. Unless you really abuse them though you easily get 250k out of them, which is 10-15 years for me if I get one at 100k.

As far as WVO, I hate French fries and don't think I would be able to stand it or the extra work, so I would be running diesel only.

WGHyrum 06-27-2013 08:21 AM

Quote:

Originally Posted by OverkillYJ (Post 3904027)

Yeah well a 302 has about 300 lbs of torque stock. I have a ton of aftermarket options easily available if I decide to I build it, and if I kill it they are cheap and plentiful. Once I put in the first it is a direct swap to replace. Unless you really abuse them though you easily get 250k out of them, which is 10-15 years for me if I get one at 100k.

As far as WVO, I hate French fries and don't think I would be able to stand it or the extra work, so I would be running diesel only.

Cool. I understand that. I guess I just love diesels. In college I had an 82 rabbit convertible running on WVO (from a chinese place, smelled like spring rolls). Loved the thing.

I respect your decision. Totally do-able and probably cheaper. I'm excited to see the build.

Tacshrp 07-16-2013 06:28 AM

Quote:

Originally Posted by OverkillYJ (Post 3904027)

Yeah well a 302 has about 300 lbs of torque stock. I have a ton of aftermarket options easily available if I decide to I build it, and if I kill it they are cheap and plentiful. Once I put in the first it is a direct swap to replace. Unless you really abuse them though you easily get 250k out of them, which is 10-15 years for me if I get one at 100k.

As far as WVO, I hate French fries and don't think I would be able to stand it or the extra work, so I would be running diesel only.

Overkill! My only question is:
HOW CAN ANYONE HATE FRENCH FRIES???!!!
Lol

OverkillYJ 07-16-2013 09:22 AM

Quote:

Originally Posted by Tacshrp (Post 3967529)

Overkill! My only question is:
HOW CAN ANYONE HATE FRENCH FRIES???!!!
Lol

They smell like McDonald's. I hate that place too. Love me a good cheesesteak though.


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