Talon101

Anyone know if you can put a 4.0l inline 6 from an 93 jgc to a 2012 jgc?
Just curious. Would it be legal?

Anyone? Just curious.

CrazyWJ242

If you have to do an emmsions test every year, it'll likely fail... the pentastar is a decent engine, get a good programmer and you'll be surprised by it...

but the inspections is what would hold it back... nothing illegal about it so long as all the emmisions equipment is installed and all that nonsense...

if your going to put the work into it, it would have to be a built 4.0L, otherwise id put in a hemi...

Talon101

Hey CrazyWJ242,
When you say built, do you mean built from scratch with all new engine components?
Oddly , i wonder because I asked earlier whether the straight 6 is better than a v6 and another
senior member (04wjguy) suggested that the old engine is in fact better because 90 percent
of the torque for a 93-2006(i think) straight 6 is available from 1500 to 3200 rpm.
Interesting topic to say the least.
Honestly, I don't like an ALL aluminum engine, with just steel sleeves in the cylinder walls for safety.
I think that jeep is not appreciating that A JEEP IS A JEEP not a car. It's meant for off-roading not
high efficiency on the highway. I think jeep is forgetting what JEEPS are made for.
Am i wrong.

Snowdog Marc

You might want to look into the local laws a bit. From what I understand the engine you swap in must be of the same year or newer and meet all the requirements of the year of the engine that is swapped in...IE all emissions from the swapped motor must be present and functioning. You can't take out a 2011 engine and swap in a V8 from the 60's and ditch all the emissions.
I did a V6 swap into my 88 YJ from a 98. I had to install an OBD2 system and all the trimmings along with getting the computer reprogrammed to get it running with no codes.

Talon101

I see what you are saying but, what I mean is that you change the engine and
make sure all the emissions bs is in place as well.
I still don't like an all aluminum engine. Is engine weight such a big deal given the 93 grand cherokees
engine weight. That jeep does damn well if you ask me.
I just don't get it...
Take care

CrazyWJ242

I meant built, turned into a stroker, with all new internals and all of that...

these new Pentastar engines are something else, and they do offer more power than previous engines, its a matter of the track record... 4.0L are still running strong, and with a bit of work, their even better...

thats the only reason i would install one in it... or if there was something drastically wrong with the new one... but theres really not...

Talon101

Hey CrazyWJ242,
I had to look up what a stroker was, but i like it.
I guess we will see in time how the new engine does compared to the 4.0l inline.
I've read some articles how aluminum tends to bend under high stress conditions.
I like how they want to innovate the engine but i would have gone with the mds
with cast iron engine and aimed for having 90 % of the torque at 1500 to 3200.
Just my opinion.
And thanks for the info, I may one day do what you suggested for the i6.
Take care.

CrazyWJ242

yeah, what i had planned to do was go down to the southern states (North Carolina where i lived for 10 years) buy a old ZJ (like the 93 ZJ i bought) bring it up to New Brunswick (which i didn't) and build the motor into a 4.5L stroker (which i'll still do sometime)

but basically get a salt & rust free jeep, put all new suspension under it so it rides like new, and rebuild a motor so it runs like new... that would last a long while around here and be AWESOME

Talon101

Dude,
That would rock.
My 4l has 249 thousand kms, it runs well but needs a new valve cover seal,
leaks oil.
I love your idea though.
I think that jeeps are a vehical that are WAY underrated.
I mean, u should expect some repairs needed if you buy used.
I LOVE JEEPS.
HOPE they live forever.

missmyXJ

You can do anything if you have enough talent,money and time. Dropping an old 4.0 into a 2012 just isnt that simple. Your taking an expensive vehicle,tearing out a superior powerplant and drivetrain. The nag trans wont fit a 4.0 Even if you got a drivetrain installed now you have a vehicle that has lost all of its trac systems,abs,esp all because it was drive by wire. The days of swapping out powerplants are all but dead my friend. So now it will never pass a safety inspection or drive clean test. I love my old Jeeps and 4.0 just like yourself but what your considering just isnt practical. The pentastar is far superior in power,emissions and economy. You would be taking a huge step backwards and destroying a nice Jeep. Go drive a 2012 grand cherokee and try to convince yourself that your current 93 drives better.
Has Jeep forgotten its way?? Not with the grand cherokee. It was never targeted for off road use. Its a yuppie Jeep and always was. Sergio that runs Chrysler and Fiat is a huge Jeep fan.(wrangler) Notice the real Jeep still sits on a full frame with old school design. Grand Cherokee is targeted toward BMW owners etc.
The 4.0 as good as it was and is went the way of the dinosaur. Leave it where it belongs in tough old Jeeps.
The whole idea behind the Pentastar was to dump all the other 6 cylinder engines. Now we have one engine platform in all Chrysler products. Imagine the money saved.