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Old 03-04-2014, 06:22 PM   #1
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Best jeep engine.

I was wondering what everyone thinks is the best engine ever put in a Jeep. It can be any engine to any Jeep vehicle but it must be a FACTORY engine. And remember you are more convincing with facts and statistics about durability, power, torque, anything. Although feel free to put in your opinion.

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Old 03-04-2014, 08:28 PM   #2
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I am really looking forward to this thread. As a JEEP Virgin, I am in the market and have questions/concerns about the new v6. Everyone I know raves about the 4.0 inline 6, so I would assume it will be the favorite, but I would love opinions about other engines.

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Old 03-04-2014, 09:08 PM   #3
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The 6.4 in the SRT8 GC. Of course
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Old 03-04-2014, 09:31 PM   #4
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The 6.4 in the SRT8 GC. Of course
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Old 03-04-2014, 10:39 PM   #5
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I'm a fan of the 4.2, but I have fond memories of my father taking a hammer to the carter carb because the needle valve was stuck on his 78 CJ. The 4.0 has my vote though because it was the perfect mix of technology and simplicity.
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Old 03-04-2014, 10:58 PM   #6
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I was wondering what everyone thinks is the best engine ever put in a Jeep. It can be any engine to any Jeep vehicle but it must be a FACTORY engine.
Yep, I'd say that 470 hp HEMI in the Grand Cherokee SRT would be at the top of the list as far as factory Jeep engines are concerned. The $70,000+ price tag seems a little high.
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Old 03-05-2014, 03:21 AM   #7
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Yep, I'd say that 470 hp HEMI in the Grand Cherokee SRT would be at the top of the list as far as factory Jeep engines are concerned. The $70,000+ price tag seems a little high.
That is the irony of the Wrangler. Buyers are willing to pay a very large premium for a limited edition vehicles with high performance engines and suspension and Jeep fails to take advantage of this. Instead they offer special editions with badges, stickers and paint.
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Old 03-05-2014, 06:57 AM   #8
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258 for sure, the 4.0 is close though. I say the 258 because if you put a Weber + HEI they run pretty awesome & you don't have to worry about electronic crap like sensors taking a dump on you.
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Old 03-05-2014, 08:50 AM   #9
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The 6.4 in the SRT8 GC. Of course
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Old 03-05-2014, 09:03 AM   #10
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4.0L Inline 6. It was strong, reliable and easy to work on.
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Old 03-05-2014, 09:45 AM   #11
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The 6.4 in the SRT8 GC. Of course
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Yep, I'd say that 470 hp HEMI in the Grand Cherokee SRT would be at the top of the list as far as factory Jeep engines are concerned. The $70,000+ price tag seems a little high.
Yeah...
When I saw this thread yesterday, I was basically going to type "Hemi" and lock the thread so it does not become a pissing match. But the thread seems to be doing OK.

Still...the Hemi is the obvious answer.
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Old 03-05-2014, 09:30 PM   #12
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I love my 4.0 I6 I love how durable and easy to work on it is and it does it's job. However, if I had the money and time to do an engine swap, HEMI.
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Old 03-05-2014, 10:47 PM   #13
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My 1974 CJ5 Renegade, had a 304 V8 engine in it. It was powerful, fast, and mine had over 150,000 miles on it with only minor repairs!
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Old 03-05-2014, 11:10 PM   #14
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It was hard to beat the 401 V8 in the 1977 Cherokee I had. I miss that old beast. Train loads of torque whenever you want it.

Back in the early 70s you could have the dealer swap a 401 into a CJ which would have been great. But the 304 was no slouch.

In a Wrangler the 4.0 is probably my #1 choice. Lots more usable torque than either V6.

Of course the modern Hemi is no slouch in the Grand Cherokee and a great motor to swap into a Wrangler.

I may change my answer when I try out the new diesel. But I'll probably still end up with a Hemi GC as my next vehicle.
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Old 03-05-2014, 11:11 PM   #15
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The 2nd half 1970 360 V8, 4bbl. Just a hair shy of 300HP and 400ft/lbs torque in a solid and reliable package with minimal extra gadgetry messing it up.
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Old 03-05-2014, 11:16 PM   #16
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My 1974 CJ5 Renegade, had a 304 V8 engine in it. It was powerful, fast, and mine had over 150,000 miles on it with only minor repairs!
The 304 was rated at around 150hp. I'll take the 4.0 over it anyday. Anything seems fast with fender well headers and stubby little mufflers dumped out in front of the rear tires.
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Old 03-05-2014, 11:34 PM   #17
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The 4.0...no doubt
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Old 03-05-2014, 11:46 PM   #18
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Another vote for the 4.0 liter.

Had two of them, each went well over 150,000 miles before we traded one off, and my son totaled the other by rolling it a couple of times. Those motors were/are strong. I drive my son's 1998 Jeep now and again and am still impressed by that 4.0 inline six. Quite possibly the perfect Jeep motor.

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Old 03-05-2014, 11:55 PM   #19
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4.0, with the 304 on second and 4.2 in third.
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Old 03-06-2014, 01:22 AM   #20
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Strictly speaking about the engine, I had 2 4.0s and 1 4.2 and I must have missed something good about them. With regard to Jeeps, I would have bought them even if they had the proverbial hamster in a wheel. Somehow Jeeps are not about the engine ...

The best is yet to come!
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Old 03-06-2014, 01:26 AM   #21
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Love the 4.0 besides the 05--06 w the stupid opda issues
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Old 03-06-2014, 03:11 AM   #22
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The 4.0 is the best. They may have their issues but even the 4.9 fords and 3.8 V6 GM motors have problems. I've owned two jeeps and two fords with straight 6 engines and never had a problem... Other than hating the sound the exhaust makes. Soon I hope to add a cummins to that list.

The majority of problems I see on the 4.0 engines are malfunctioning sensors and leaking valve cover gaskets... I've seen em blown up before, but it's pretty uncommon. Normally the jeep is in the junkyard before it blows up.
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Old 03-06-2014, 05:20 PM   #23
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I would have to go with 4.0 for this kind of durability:
It keeps running after it explodes...


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Old 03-06-2014, 06:07 PM   #24
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I would have to go with 4.0 for this kind of durability:
It keeps running after it explodes...


No vehicle should ever die like that.
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Old 03-13-2014, 11:25 PM   #25
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noone even mentioned the little 2.5,.yea its under powered but its still a tank of a motor, and there is no real way of getting more power out of it except regearing and maybe an electric fan but they are simple to work on if u ever have to,,its not all about hp when ur deep in the back counytry one of the most reliable engines out there...so if u break down in the back 2000 acres in a new engine what good is the hps..,,,but my vote is still the 4.0,, tough rerliableand plenty of tourqe
i have had the little 2,5 it got the job done for years with no problems at all..
i hate all the new gagetry of the newer engines with all there electronic stuff thats just asking for trouble one of these days..
i have had the pleasure of driving the srt8,s and yes they put a smile on ur face everytime u mash the skinny pedal......
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Old 03-14-2014, 01:33 AM   #26
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The 4.0 simply for the reliability if properly maintained. One of the guys in my wheeling group has a 98 Cherokee with a little over 300,000 miles on it and it's still going strong, he hasn't even had to rebuild it yet which is just amazing to me.
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Old 03-14-2014, 02:01 AM   #27
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4.0
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Old 03-14-2014, 11:46 AM   #28
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Quote:
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The 304 was rated at around 150hp. I'll take the 4.0 over it anyday. Anything seems fast with fender well headers and stubby little mufflers dumped out in front of the rear tires.
I think it would depend on what a person is looking for in a Jeep...
Power : Hemi-"My choice for newer Jeeps 97-06..obd2..
Sound :304-They have a unique sound..."Like a Harley".."MY CHOICE"4-older model Jeeps...to 1995..
Durability and easy to work on +fuel econemy : 4.0 I6.w/efi..All Jeeps..obd1 and obd2...


There are no other choices , any other Jeep , is a jeep looking for a transplant to one of the motors above......
NOTE; I'm speaking for Wranglers , CJ , TJ , YJ ..Only..
Only my opinion - LOL...Who's with me ??
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Old 03-14-2014, 12:31 PM   #29
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The best to me is the one that is running correctly and moves me down the road or trail. I do think it would be cool to put a little 273 into a Wrangler.
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Old 03-14-2014, 01:00 PM   #30
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The Hurricane 4 cylinder in the early CJ and the 258 cu straight six in the later CJ.

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