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The Jeep 4.0L vs. the 3.8L | TruckU | Season 8 | Episode 18
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- Опубликовано: 30 окт 2016
- We go Head to Head with two of Jeeps most talked about engines. The solid 4.0L versus the 3.8L.
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Tags: Two Guys Garage, Kevin Byrd, Willie B, How-to, Fix, Repair, Update, Build, Customize, Modify, Maintenance, Maintain, Improve, Restore, Enhance, Truck, Vehicle, Ford, Chevy, Dodge, Toyota, New, Used, Classic, Truck U, TruckU, truck u, trucku, Car Fix, All Girls Garage, Matt Steele, Bruno Massel, Bogi, Christy Lee, Rachel De Barros, Jared Zimmerman, Lou Santiago, TV Show, Brenton TV, Brenton Productions
My niece lost the oil in her 4.0 and didn’t know any better and drove it home. It got oil back in it and was fine, like to see the 3.8 do that. 4.0 is bomb proof!
Bounce it off the limiter a few times she'll kick a rod eventually
That happened to our 2009 JK 3.8. Still running fine at 150k miles knock on wood.
It’s known for consuming oil yet is considered to be a durable engine so I think you’re a little off base. Im sure many people have run the 3.8 low on oil.
That supercharger cost as much as a XJ does so.......yea 4.0 is better you just really proved it
I know you guys are funded by sponsors but it felt like this was 75% advertising and 25% content. You didn't even deliver on the title of this video, the TJ never even drove. I believe you guys have the ability to make good videos, but what you've been doing on TV for 20 years or however long it's been won't cut it anymore. Dirt everyday from MT is the benchmark for me and this is no where close.
Brad Bowman RT
I do like the guys on the show, and used to watch it all the time. But the show does seem to be more sponsor content than actual useful information.
agree. They spent 2 minutes on the 4L and all they did was put the old head back on.
"This episode sucked ass"
...as it was a controlled advert for products / sponsors and not a head-to-head competition to where the 4.0L vs 3.8L duked it out was ever shown.
The Jeep 4.0L is the superior engine in all regards and it's wasn't even wheeled in the same terrain, yet even driven where the JoKe was.
If the TJ were offroad, it would have gobs of controlled low-end torque to beat the minivan motor that the thin sheetmetal'd Jeep JoKe used.
ChryCo. Jeep shot themselves in the privates by getting rid of that AMC inline six motor: it was old and not modern, but worked for what it was designed to do and was tougher than any v6 that Chrysler used after it.
Horsepower sells cars; Torque moves them.
*Last year for any real Jeep was 2006*
Dirt everyday rocks !
My 1999 Jeep Cherokee Xj has almost 400,000 Mile's and is just like new......4.0 BEAST!!! IT EVEN HAS THE ORIGINAL HEAD GASKET AND CAT...ONE OF THE BEST ENGINE'S EVER BUILT, BY FAR
4.0 gets a set of roller rockers 3.8 gets a supercharger. didnt need to watch any more. the 3.8 will never be able to live up to the 4.0 and you just proved it.
Blake Graves lol thought the same thing
yet there are far cheaper superchargers for the 4.0, even a set up to use junkyard ones off the gm 3.8 lol but hey guess that would be unfair right haha
You did not watch the whole thing, as you said, so let me fill you in on the comparison: there was never any sort of dyno or actual driving comparisons made. None. This is total CLICKBAIT shit posted to sell stuff to kids. It is garbage. You called it. I wish I had read your comment before wasting over twenty minutes of my life waiting for comparisons between the two engines that never happened. Further, ding-dong dripped the rear of the head onto the gasket before it was lined up. In fact, the gasket was not even on the block straight. You can see the other guy have to move it back after the first one dinged up the cylinder 6 area. You can clearly see it. I am fairly certain that the head gasket was pinched hard in several spots, and that's a big no-no. TruckU sucks.Someone needs to tell them to TruckOff!
Gotta make it fair ...for the price of the blower though you could drop a 4.7 in the tj
3.8 has such a huge power advantage. Its based off Mopar wedge engine with high output inmind during design.
Even our 3.3s are wound like the eagle hemi with power to weight ratio.
I just rolled over 330k on my 97 4.0 wrangler. I do routine oil changes 3x a year. This engine goes forever ever ever ever.
23v0lv32 I almost have 330,000mi. on my 99 Xj and it still runs and looks like new. Definitely one of the best motors ever.Run forever
I got 2. 1 has 305,000 other has 294,000 still running top notch. The best. And found, to me, basically a brand new 06 tj with only 57,000 on it. Cant beat em
23v0lv32 even when she’s cracked she’ll go as long she ain’t leaking too bad 😂
Great man! One of 99 XJ 4.0L/AW4 is coming up on a quarter million. Still fries the rear tires in 2WD. I love it. Don't think the engine has ever been apart. I have 4 total: 2) 2doors, 2) 4doors. Combined they have probably 730,000+ miles. Awesome rigs! 3.8V6 is a joke. 4.0I6 forever!
2000 xj 218,000 daily driver, had a 96 with 238,000 then a damn deer ended that
Was suppose to be a video comparing the two engines.. ended up being a 15 minute commercial. Thumbs down
4.0 was the last good engine Jeep had
Hunter Sieling I got a 91' Cherokee with a 4.0 in line 6 that I'd been wanting to fix up
I love my Jeep. Its beaten up,not very good on fuel but it keeps going. I have got quite a few better nicer cars but my XJ 4.0 is actually my favourite.
This is why I put a 4.0 and AW4 from a 1994 XJ in my JKU. So much better than the shitty 2.8 crd at came with.
Amen! My dad worked at the Kenosha Engine Plant where many of them were made. He was a Journeyman Tinsmith.
J J when the 2.5 and 4.0 died, jeep died with them.
I felt like they only talked about the differences of the engines for like two minutes, then the other 20 was advertising for parts that mostly didnt have to do with the damn powertrain. Thanks for waisting my time :)
lol the 4.0 is so much better it isnt even close
I waited 22 minutes to hear a comparison between the 4.0 and the 3.8...
Never happened
Lol because there is none.... 4.0 rules
Add equal upgrades, or test them stock vs stock. Rockers on the 4.0 and a supercharger on the 3.8 just to compete kinda says it all.
Those 3.8s blow up on their own. That blower was just like pulling the pin on the grenade lol.
When I was researching my caravan with 3.8 I remember reading that the 3.3 and 3.8 couldn't handle boost. I wonder how long this engine lasted (or if they did something to make it tougher).
How about valve adjustments?
99 tj 4.0 225000 on odometer just replaced timing components
Elias Salazar: 235,000 3.8 still rolling just fine, and I beat on it. and still pulling vacuum from the oil cap. No blow-by.
Just had a rod bearing spin on my 07 JK with 168k on the motor.
The 4.0 is not a engine, it was nothing but a Jeep LEGEND!!!! I owned 3 and one with over 300k miles. Never will Jeep make a mistake of building something so rock solid, no money in it for them.
They took the head off because 00’s and 01’s had a casting defect which lead to a cracked head between the 3rd and 4th cylinder. That wasn’t the same head, they just bought a new one lol. Still the 4.0L is a beast and has no equal.
Figured it’s worth mentioning the issues are from 1999-2002 pre 99 or most of the mid 02 year motors didn’t suffer from the poor quality 0331 cylinder heads
My 4.0 is going on 29 years with 200,000+ miles on it, no problems whatsoever
Proud 1998 Jeep Cherokee 4.0 owner here. In the 300k club, no oil adds between changes yet!
I want to do a stroker 4.0L based engine swap in my 2004 WJ Freedom Edition. But the damn 4.0 runs perfect, it gets 18MPG all day, and it won't die.
@@xmo552 That would be AWESOME! 4.0 is bullet proof.
3.8s are alright. I drive a taxi (a Chrysler Town and Country) with one that has more than 350,000 miles on it and it's quick... once you rev out 1st gear. But the 4.0 is better in every aspect without a doubt. Especially in an offroad application. I wish a 4.0 I6 could fit in my taxi.
4.0 best Jeep motor hands down
Why pull the head to do valve stem oil seals on that 4.0l. The seals can easily be replaced with the head in place. Nevermind, I see its for product placement advertisement.
Pulling the head of the 4.0 isn't what I would call ambitious...4.0 is the kind of motor you slap a new headgasket in Sunday morning before church😂. Try that on the 3.8 lol
Why yank the head to change valve seals? Just roll the piston to TDC release the spring and change the seal. But oh well I saw where this was going and checked out.
When you say "church" you really mean off-roading, right?
I know that's where my church is.
Looks a lot easier than my miata Head, and even that is really simple.
For me it would be the 4.0 Straight six, easy to work on and last a long time.
This was the longest commercial I’ve ever seen.
My 99 Cherokee Xj has almost 330,000 miles and still runs like brand new....
Yep, my 99 2door still goes down the highway 100 mph.
You will never out perform the 4.0 in Torque and longevity
This is shit, there just plugging people's products and claiming it's educational. No direct comparison between the motors, no talk of reliability.
190,000 miles on a 3.8 with larger tires in a heavier rig.. Good luck on your oil consumption and your main bearings. I've made a bunch of money LS swapping these JK's . Meanwhile my 4.0 has 290,000 miles most of that on 33's :) If you want power.. Turbocharge it. LOL
4.0l is nice to stroke out as well
The solution to the oil consumption issue with the 3.8 is use to use 5w-30 instead of 5w-20. That’s what the engine originally called for. Chrysler changed to the lighter weight to improve fuel mileage to improve EPA standards. The 3.8 is totally fine. I don’t get why so many like to rag on it.
I’ve had a 2009 JK with the 3.8 in it for 12 years and it now has 150k miles. I’ve never found it lacking.
blow by from a head gasket? pretty sure blow by refers to combustion leaking past the piston/rings...
The Jeep 4.0 is still a basic early Rambler inline 6 engine with modern day cylinder head modifications for EFI and emissions. An Iron Horse that will last forever.
92 xj 484,440 miles currently, original engine. daily driver. sounds like a sewing machine still
Same here got a 1993 with 385k never skips a beat.
What tye of oil and filter do you use ?
I know a few people with the 3.6 v6. They speak quite favorably about it.
I love the 4.0 in my 06 with the 6 speed.
That supercharger got me lookin at my 3.8 caravan 👀🤔
YuckFou502 do it
You won’t do it!
DO IT!!!
YuckFou502 my wife speeds as is let’s not give her any ideas 💡 lmao
Yea, I dare ya to do it.
the 4.0 is a tested true runner. to the redline off the rev limiter in the mud for years it will run go and go.. youll get 200k easily out of the solid power plant. the 3.8 is junk minivan motor. their prone to just falling appart under 100k miles under just driving down the road. a super charger will just kill it quicker..
Yes, agreed. But I HATE the Hemi swap option because I like it to be closer to original. I want to do the 505 performance kit to beef up my 3.8 then strap a super on it. F Hemi in a jeep. I like to keep the engine bay accessible for tail fixes.
jimmy neutron
I love the 4.0, but to ignore the huge number of high mileage 3.8s out there is just bad math. It doesn't measure up to the 4.0 in the power arena, but they aren't fragile.
And the minivan line is old. How many v8 station wagons shared a motor with a muscle car? Many, and I've yet to gear anyone bitch about an impala or camaro having a "station wagon motor. "
nate taubitz the 505 kit doesn't seem like it's the answer everyone hoped it would be.
Hemi in a JK? Eh, you could, but the best value looks like an LS swap.
jimmy neutron 330,000 and still going strong.
Did you know that the 4.0L straight 6 was built first by AMC(American Moters Corporation), and the Chrysler 3.8L dates back to the Chrysler K body derivatives C body New Yorker/ Fifth Avenue in 1992. The Caravan Grand got the 3.3L V-6 and the 3.8L V-6 as options for the 1993 model year.
Glad to see this video. Love the work ad products you used. Only bad thing was the promotion of 505 performance. You guys are great but as for 505 performance, bought 3 of their motors and all three where built incorrect and had to pay to have all 3 rebuilt right from start up. Keep up the good work.
“Wanna see my cool roller rockers? There underneath the valve cover, look pretty cool huh”?
Lol the head gasket for the 4.0 has stainless fire rings to keep them from blowing out. It was a old school thing drag racers did to there motors back in the day. Not new stuff just a new style and way to put fire rings in....so no it’s not for “blow by” lol
I've owned a supercharged car and I had also had the same model that was naturally aspirated. The supercharged car drank 93 like it was going out of style. The supercharger adds more air and that requires more fuel and that drops the MPG. Because superchargers are belt driver it takes power to make that power plus it's always turning and causing you to burm more fuel than stock. But the fun fact is insane with a twin screw blower becasue the hit is so big and so early you just can't stop grinning like an idiot every time you mash the gas.
waste oil heaters are SICK.... we have a 350,000 BTU unit at my shop
can be -40f inside the shop..... in 20 mins its a nice 75
Despite the heat soak and over heating issues due to the design of the 4.0. The 3.8 can’t and won’t hang in terms of durability. Of course the maintenance and care that you give either engine is a big factor.
That being said.... Giving roller rockers to one and a charger on the other? Seriously? LoL
Give the 3.8 the charger..... Give me the stroker kit on the 4.0. Ok? Let’s go!!! 😉✌️
The Jeep 4.0 DOES NOT have overheating ISSUES ,,,,Due to it's design! LISTEN up,THIS IS AN OLE SCHOOL BLOCK HAS MORE COOLANT TRAVEL PRESSURE ALL ENGINES IN THE 40,,s50,s60,s to about 1977 THE LOWER HOSE ALWAYS HAD WIRE SPRING INSIDE WHEN YOU GOT ONE AT AUTOSHACK,NO ORIELY,AUTOZONE or ADVANCE ,,,THIS WIRE KEPT THE HOSE FROM COLLAPSING,THE 4 .0 IS A SPINOFF FROM HUDSON ONE OF THE FINEST AUTOMOBILES EVER MADE,HUDSON WAS BOUGHT BY AMC, THEN CHRYSLER' BOUGHT AMC THE 4.0 IS 70 YEARS OLD!!
Did the 3.8 survive the Supercharger? For how long? There's little information available about the 3.8's crank - the Cast Crank in the 3.3 version of the motor is the reason why the factory nixxed any plans to add boost - In the dyno cell used to homologate he motor for emissions and production testing, a turboed 3.3 had the crank let go without warning. It's documeted over on the Allpar website with an interview from the dyno cell operator.
I'd take a 4.0 with 250k miles before a new 3.8 mini van motor. (My Cherokee has 385k and runs like a champ)
What the truck? Truck off, it's truck u!
The 3.8 is a solid engine with a little more power than the 4.0 and a similar power curve.
What gives many the impression it has less power is the lag in the drive by wire system and a poor rear axle ratio that Jeep chose for the JK on base models.
Nice sales pitch though, lol. But hey, good luck with the 3.8, the 4.0 is where it's at on this run hands down...
What killed the 4.0 more than anything else was packaging. You only had one platform using the motor. About the only other possible platform was as the base engine in the Ram. Mound Road had a lot more traction in corporate than KEP so that wasn't gonna happen. Getting it to pass tighter emissions would be a real bitch. Their were options on the table so to speak. By putting meat back into the block they could have gone diesel. As I understand it a 24 valve head was looked into. Both pushrod and OHC.
My yj 4.0, 91 first year of the 4.0 in a wrangler, would crawl over both these jeeps, leak a bunch of shit and then climb 10 trees and a mountsin
The 3.8 v6 minivan engine is trash compared to the 4.0.
The 3.8 wont last anywhere near as long as the 4.0 even with double the maintenance.
+25 bhp and +25 ft-lb from roller rockers on the straight six jeep engine? you guys must have misunderstood 505, cuz that is plain bs. put in a performance head and you can get that much increase, but not just from roller rockers.
If they're different ratio rockers you can gain some power, but 25/25 is a bit much
lol i have a set of 1.7 rollers in my 4.0 and well you notice them you kinda dont to be honest, and no it was not 25/25 it was about the same as a good exhaust and air filter change, noticeable but not by much
They said 2.5 if that🤣
is this a fel pro commercial?
I bet you they were heavily sponsored by Felpro; all they did was jerk themselves off while talking about gaskets.
Well fel pro works. A lot of racing people use them.
Did they just clame a supercharger will increase mpg??.
A 4.0 stroked to 4.5 will get just as much torque, cost less to build, run on regular 87 octane. A jeep that needs premium gas is a bad idea if you ask me.
John
Are you running a 4.5L? What kind of MPG are you getting ?
on the 3.8 what about the ecm pcm? will there be any changes that either computer will mess up over?
So weird seeing the 3.8 in the proper orientation, and not transverse mounted.
Roller rockers have pen bearings that tend to break and fill your engine with metal making it less dependable and that’s what these engines are known for you just removed its main perk. Keep your factory rockers this is shiny junk
I know that parking lot, behind the old Kahoots feed store for the burn out...Sounds good..
Anyone else cringe when it looked like they were clanging the head against the new gasket around 4:00 ?
The 08 2vdoor 6 speed clutch 4x4 3.8 has been good 2 me for what i got in it
I never met anybody who put a blower on and said im getting better fuel milage hahahaha
These guys are on RUclips making content like RUclips doesn't exist yet
So when you put in the supercharger on the 3.8 why didn't you upgrade anything else? Is the engine strong enough to handle the boost or should you up grade the value heads? I'm just trying to understand. Dont want to buy something that will break every if I'm not told to grade things first.
please compare the 3.8L to the Pentastar if possible...
Man these guys are fucking advertisers extraordinarie, almost thought they themselves were made of sponsor parts
This was a great infomercial!
4.0 wins, hands down.
For that matter, I6 always wins, be it Jeep, Toyota, Nissan, BMW, etc. Over V6's. Just a battle proven engine design, IMHO.
Wow a super charger that gives you better fuel economy. What wonderful times we live in.
Lol you will NOT get better fuel mileage by adding a super charger.
4.0l gets roller rockers 3.8l gets a supercharger? lol....
to bad they dont make this kit anymore i been looking for boost for my 3.8 for a year
Laugh but I owned a 4 cylinder wrangler and never had a problem with it off road, nothing insanely crazy but that jeep wouldn't stop grabbing and crawling. I have the 6 unlimited sport now and love it, however I haven't done much off road with it yet.
"+25 HP W/ Roller Rockers"...!
Is that true? I would have guessed 5hp gain, maybe 10....
I call bs!
It's bullshit. Of course it is engine defendant. But you might see 10hp at the most. 25hp gain might be true if you compare 1.3 break in rockers to 1.6 or 1.7 aftermarket rockers 🤣
I wouldn't waste money building a 3.8, junk motors. Best thing for a 07-11 Wrangler is a GM or Hemi.
nonono..... 1 word: Cummins
Blake Watson 4.0 is one of the most reliable motors ever made.
You'll never see the likes of the 4.0L inline 6 ever again. This is the age of obsolescence. The 4.0 is perhaps the greatest engine of all time regarding longevity and low end torque. The 3.8 is ok if you upgrade the gaskets for the oil pan, valve covers and manifold. Chrysler used inferior gaskets causing the 3.8's to fail on purpose among other things. They knew they could never continue on with the 4.0L. Too much money at stake. While upgrading all the gaskets on the 3.8 makes it a more dependable engine, it will never be anywhere near as good as the bullett proof inline 6 4.0L!
Did they say how much was shaved on the 4.0L? Any one know haw far I can go? Trying to up the compression slightly when I have it apart
VERY disappointed that you did not do a 505 Performance turbo kit on the 4.0L !!!!
Ok lets see how that 3.8 is in 250,000 miles. Oh wait they won't last past 60k to 80k. I have replaced about 8 of them. Also lets stroke the 4.0 anr compare then. What a crap comparison. Apples and Oranges. Also did you mention where the torque comes in on both engines. Not!
How is this even a contest? Longevity wise the 3.8 is one of the worst motors ever made. The pentastar series was a horrible designed engine. Timing issues plagued the 3.8 with tensioners often failing right out of the box. Along with lots of overheating and cooling system issues, mostly due to the fact that plastic is used for crucial parts like the water outlets. The 4.0 isn't perfect and has issue but, has farrrrrr more dependability than that 3.8 junk.
Hello supercharger, goodbye stock headgaskets
Woah woah guys! It's the little things that make the difference the $15k cage is just secondary
Sorry guys, 90% advertising, 10% content, very little to do with the video title. Don't often give a thumbs down but this type of content is usually seen on late night shopping channels
Thought I saw these guys hanging out at the airport, selling bibles.
One big damn infomercial!!
4.0 vs 3.8 and your talking about rollbars this is idiotic
This whole episode is a fallacy 😩
It went nowhere.
My XJ 4.0 straight 6 has a knock and still starts every time with 200 thousand miles on it and not shiting you it runs the same as a 4.0 with 100 thousand miles AMC 4.0 straight 6 buy one for your kids it will last high school college and then some
My 4.0 shouldn't even run but it always starts up and performs. Little leak and knock here and there is nothing
Nice click bait, no information whatsoever about the differences between the two.
Christ, why don’t you explain the history of gaskets too because obviously none of us know what one is🙄😂
Yeah the mini van motor in a jeep was a horrible idea. Swap it out for a hemi or ls chevy motor is best way because my jeep buds had their jeep 3.8 blow motor at like 70 and 80 thousand miles with lift kit and tires and 4.0 will go 200, 000 k
jason allen Your comment looks like a toddler wrote it.
i know people with 4.0 cherokees running to 713k miles
NoahBones 12: I hope I don't sound like an asshole, but what's the reasoning for so much hate on the little 3.8. It's been reliable for me 235,000 just the regular stuff done by myself.
Zachariah Woller i never hated on the 3.8, although i wish they brought back then 4.0 i6
NoahBones 12: okay sorry I used your name I was trying to talk to the whole group. But I understand. I loved the 4.0 itech AMC engine. I have a 5 speed version that I turboed, sounds like a Cummins. I just don't understand the reasoning for hate on the EGA serise and the EGJ series engines from Chrysler.
A show about jeeps... lmc truck has nothing for jeep
this was just a long commercial, "You get 25 HP from these cool looking rocker arms from our sponsor"😆. Then they never compared the two when they were done, just showed the JK go up a hill!
Like all of the other comments below I'll say it. This video is a waste of time and you people know it. But the man is making his money and y'all get free parts. Thumbs down. Same groups been doing this for 20-30 years.
Hi Pro How do I get my Jeep JK 2009? Can I increase the torque of the engine: Additions Speed Booster Super Chip
Does anyone know the outcome of this video. It seems to me that they lost their train of thought.
Were the roller rockers that they used adjustable?
Building Jeeps for thirty years. This was nothing but an infomercial. These guys should have sold skillets, steak knives or oxy cleaners. Nothing against the manufacturers that pay them but could picked a couple of guys who were a little less scheel.
I have an '18 JKU with the 3.6L pentastar V6 and it has power especially if you free up the exhaust and the upper and lower intakes and a throttle body you will be in the +320hp range N/A, and with a wet 75 shot of nitrous you will go up those dunes.
I really don't like the superchargers.
I haven't even watched it yet 4.0 rules not even close
Why not go roller cam/lifters as well?
Will the super charger fit on a grand caravan?
Would that supercharger have worked on my 3.8 Caravan?