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Old 09-27-2012, 09:44 AM   #1
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Inline-6 or V6 ???

First time looking for a Wrangler. I'm trying to decide weather to go for the older Flat 6 or the new V6. Any opinions on this???


Thanks,
Armando

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Old 09-27-2012, 09:45 AM   #2
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flat-6? as a flat head engine? or do you mean inline-6 which is OHV?

assuming you're referring to the 4.0L I-6 OHV vs 3.8L V6 OHV, they're two different animals in two different vehicles. there is also the newer 3.6L V6 DOHC. drive all of them and pick the one you like...

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Old 09-27-2012, 09:48 AM   #3
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Yeah, sorry I meant inline 6.
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Old 09-27-2012, 09:55 AM   #4
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Which ever one I get, it will be used. I am not one to "leave well enough alone", I'll be looking to do modifications. Is there particular year that is best for mods?
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Old 09-27-2012, 10:07 AM   #5
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Quote:
Originally Posted by armandodiaz View Post
Which ever one I get, it will be used. I am not one to "leave well enough alone", I'll be looking to do modifications. Is there particular year that is best for mods?
For the engine? None, really. The intake, exhaust, chip thing doesn't work very well in the jeep context.

If you're talking about modding the jeep overall (lift, tires, wheels, armor, etc.), then they all have huge aftermarket support. Check out Quadratec.com for an example.

As the prior poster noted, the 3 possible engines you're considering are quite different and come in different eras of jeeps. The inline 6 was in the TJs, which ceased production in 2006. The 3.8 and 3.6 v6s are in the current JKs, which have been produced since 2007.

You've got to go do some test drives.
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Old 09-27-2012, 12:24 PM   #6
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X2 test drive them.

TJ w/ the I6 is a tractor engine lol, doesn't pick up speed as fast as the V6 but hits peak torque at lower rpm's and has a "bullet proof" reputation for going 300K miles strong if you take care it. more simple so do it yourself maintenance is easier.

JK w/ the V6's are more car like, if you choose this pick the 3.6 if you have the money I know your buying used which is an improvement over the first JK engines w/ more horse power etc. but if you pick the 3.8 thats still fine. They pick up speed more faster on the freeway and but take more rpm to hit peak torque. They take less lift for bigger tires so you can save money in that area.
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Old 09-27-2012, 01:04 PM   #7
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Great info, thanks!
Kinda shocked they went from a 3.8 to a 3.6 it's usually the other way around and the bigger engine usually has more power. But the higher RPM with the 3.6 makes sense.
Good suggestion about the lift. I'm not looking for huge lift, just want it to look like it's got some balls.

Thanks again.
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Old 09-27-2012, 01:07 PM   #8
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Here is a snippet from wikipedia about the 4.0 H/O Straight Six

The 4.0 is one of AMC's best-known engines. It was one of four AMC engines kept in production when Chrysler bought AMC in 1987. Chrysler engineers continued to refine the engine to reduce noise, vibration, and harshness. The last in the line of the AMC inline sixes, the 4.0 is regarded as one of the best 4x4 off-road engines. A Motor Trend long-term test of a 1997 Cherokee XJ noted "this long-lived OHV powerplant has a reputation for getting people where they need to go" as well as "much love expressed by owners for the torquey 4.0-liter/190-horsepower inline six."The engine is known for longevity and to go more than 300,000 miles (482,803 km) without rebuilding. There are also many aftermarket parts available.
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Old 09-27-2012, 01:14 PM   #9
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Here is a snippet from wikipedia about the 4.0 H/O Straight Six

"The engine is known for longevity and to go more than 300,000 miles (482,803 km) without rebuilding.
So does this mean I shouldn't worry about all the Jeeps for sale with 100K + miles? There's a lot of them out there and they're kinda cheap....
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Old 09-27-2012, 03:38 PM   #10
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Worry more about rust ... and if it has high mileage, get maintenance records. Check what you can, make sure the oil and fluids don't smell burnt, no water in the oil ect. If you go older, the engine replacements are cheap!
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Old 09-27-2012, 03:46 PM   #11
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Quote:
Originally Posted by armandodiaz
Great info, thanks!
Kinda shocked they went from a 3.8 to a 3.6 it's usually the other way around and the bigger engine usually has more power. But the higher RPM with the 3.6 makes sense.
Good suggestion about the lift. I'm not looking for huge lift, just want it to look like it's got some balls.

Thanks again.
I noticed that a while back. They went from a 4.2 in the YJ's to the 4.0. Then the JK changed out the TJ's 4.0 for the 3.8' and later the 3.8 was traded for the 3.6. They get smaller by .2 each time.
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Old 09-27-2012, 03:58 PM   #12
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So does this mean I shouldn't worry about all the Jeeps for sale with 100K + miles? There's a lot of them out there and they're kinda cheap....
as always, avoid the 2.5L, check for knocks, etc... If there isn't any loud knocking and no burning oil chances are you'll get a lot of time out of the 4.0L I-6. Its all the other components with 100,000+ you have to worry about. Mostly stearing parts, tie rods, drag links, shocks, etc... all those will prob. need replacing but heck its a good reason to get an older jeep and lift it with new suspension parts lol.
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Old 09-27-2012, 04:03 PM   #13
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Originally Posted by armandodiaz

So does this mean I shouldn't worry about all the Jeeps for sale with 100K + miles? There's a lot of them out there and they're kinda cheap....
I've got 336k on my jeep. Never needed a rebuild. What you have to look out for is an early tj with like 30,000 miles that they want $15k for. Those are driven short distances a lot, and sometimes are only used off road, which is harder on the engine than cruising down the highway.
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Old 09-27-2012, 04:16 PM   #14
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Here is a snippet from wikipedia about the 4.0 H/O Straight Six

The 4.0 is one of AMC's best-known engines. It was one of four AMC engines kept in production when Chrysler bought AMC in 1987. Chrysler engineers continued to refine the engine to reduce noise, vibration, and harshness. The last in the line of the AMC inline sixes, the 4.0 is regarded as one of the best 4x4 off-road engines. A Motor Trend long-term test of a 1997 Cherokee XJ noted "this long-lived OHV powerplant has a reputation for getting people where they need to go" as well as "much love expressed by owners for the torquey 4.0-liter/190-horsepower inline six."The engine is known for longevity and to go more than 300,000 miles (482,803 km) without rebuilding. There are also many aftermarket parts available.

This will be an awesome signature!! lol
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Old 09-27-2012, 04:52 PM   #15
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I take it you guys wouldn't bother withA the I4 engine... Unless to do a transplant?

A lot of cheap I4s out there
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Old 09-27-2012, 04:55 PM   #16
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I6 has a long stroke, means more power at lower rpms. just what you want for offroad. plus i find it easier to take a 7+ year old jeep through the woods. you dont really worry to much about scratching it.
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Old 09-27-2012, 05:16 PM   #17
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Quote:
Originally Posted by armandodiaz
I take it you guys wouldn't bother withA the I4 engine... Unless to do a transplant?

A lot of cheap I4s out there
Why do you think they're so cheap!(;
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Old 09-27-2012, 05:19 PM   #18
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Why do you think they're so cheap!(;
Cause I owned one, and it sucked.
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Old 09-27-2012, 05:26 PM   #19
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Cause I owned one, and it sucked.
I was inferring that. Letting him reason that they are cheap, therefore they must not be very good...
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Old 09-27-2012, 06:07 PM   #20
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I got both of you, thanks.I just saw so many of them, that I had to ask.
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Old 09-27-2012, 06:10 PM   #21
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I was inferring that. Letting him reason that they are cheap, therefore they must not be very good...
Actually, you were implying it. We inferred it

I'd echo what the others have said that you should try to drive all 3. Personally, I've driven the 4.0 and currently own a 3.6. The 4.0 I would say is better if it is going to be a toy as it's better on the low end grunt, but the 3.6 is much more livable if its going to be your daily driver. You can't really go wrong either way though. Happy shopping!
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Old 09-27-2012, 06:19 PM   #22
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Quote:
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Actually, you were implying it. We inferred it
Indeed. Lol
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Old 09-27-2012, 08:40 PM   #23
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Quote:
Originally Posted by the caveman

Actually, you were implying it. We inferred it

I'd echo what the others have said that you should try to drive all 3. Personally, I've driven the 4.0 and currently own a 3.6. The 4.0 I would say is better if it is going to be a toy as it's better on the low end grunt, but the 3.6 is much more livable if its going to be your daily driver. You can't really go wrong either way though. Happy shopping!
I agree with this.
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Old 09-27-2012, 09:11 PM   #24
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4.0 I6 231k running strong.

I6 is what most ocean liners, heavy construction equipment, and tractor trailer rigs use, as well as some diesel trains. It (I6 OHV) is a time tested design that balances well and provides incredible low end torque. It is also in some of the better known performance engines in the toyota line, most notably the land crushers of the mid 90s and the Supra, known to handle over 1000hp. Just to name a few great I6s.

The compramise, cause there is always a catch, is no high end rpm or large power band.

My point is whomever built it, the I6, IMO, is always superior to other engines. Now if only it were a turbo diesel...

BUT the new jeeps, apparently, have gizmos and gadgets you "can't" live without, or so I'm told. So go drive em all and pick YOUR Jeep, cause that's the whole thing. To each his own.
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Old 09-27-2012, 09:20 PM   #25
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4.0 I6 231k running strong.

I6 is what most ocean liners, heavy construction equipment, and tractor trailer rigs use, as well as some diesel trains. It (I6 OHV) is a time tested design that balances well and provides incredible low end torque. It is also in some of the better known performance engines in the toyota line, most notably the land crushers of the mid 90s and the Supra, known to handle over 1000hp. Just to name a few great I6s.

The compramise, cause there is always a catch, is no high end rpm or large power band.

My point is whomever built it, the I6, IMO, is always superior to other engines. Now if only it were a turbo diesel...

BUT the new jeeps, apparently, have gizmos and gadgets you "can't" live without, or so I'm told. So go drive em all and pick YOUR Jeep, cause that's the whole thing. To each his own.
Why is a new I6 so rare now? I love my 4.0, and like the fact that it's an I6, just noticed it all see,s to be either an I4, V6, or V8 that are popular now.
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Old 09-27-2012, 09:27 PM   #26
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Effeciency mostly, and size. They still have em in power applications, but those arent at the big dealers. The auto industry has changed dramatically in the past 25 years, as have most industries. In a word: Profit.
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Old 09-28-2012, 03:40 PM   #27
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Effeciency mostly, and size. They still have em in power applications, but those arent at the big dealers. The auto industry has changed dramatically in the past 25 years, as have most industries. In a word: Profit.
X2 on profit... more plastic plus auto's cost more than they did 25 years ago equals profit.
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Old 09-28-2012, 07:21 PM   #28
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heres a thought, everyone is quiting the i6, jeep did it, ford did it, toyota did it, etc... maybe because they lasted to long, cant make money if your customers buy one car every 15-20 years.......i have owned 5 vehicles with I6 engines in my life. hard to kill one.
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Old 09-28-2012, 09:44 PM   #29
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heres a thought, everyone is quiting the i6, jeep did it, ford did it, toyota did it, etc... maybe because they lasted to long, cant make money if your customers buy one car every 15-20 years.......i have owned 5 vehicles with I6 engines in my life. hard to kill one.
Well said.

And the efficiency Im talking about is in manufacturing more than engine performance. More body types can accomidate a 180hp V6 than a similar powered I6, although the I6 could pull the other around the lot. The new V engines are more akin to 4 bangers and Euro motors in that the power comes at higher rpm with smaller cylinders. Parts moving equals parts breaking. My I6 can stay under 2500RPM all day, and I go up to the ridge lines and down to the valleys. Higher RPM means shorter life, period. Its an operating extreme, the whole duty cycle thing. Thats why youve seen a decrease in engine size over time. They call it engine effeciency increases, when its really 1 motor goes in 7 vehicles.

Dont forget shell oil published a book in the 70s titled The 70 MPG Carborator. Its the only book I know of not in the Library of Congress. Its bigger than consumer interest or demand, thats for sure. Simple system, compress the gas in a tank prior to being mixed with air. It truely takes the gas to a vapor, allowing for 100%, lemmie say that again, 100% combustion. Vs EFI which mists the gas in with the air while its a liquid. Liquid gas is not flammable, its VAPOR is.
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Old 09-28-2012, 10:27 PM   #30
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There are advantages and disadvantages to both I-6 and V-6 designs.
A good V-6 can exceed 300K miles easy...They do it all the time. An increase in displacement on a Vee often means increasing bore more than stroke, since adding bore to an already long I-6 can make it too long to fit. This, and the short, stiff crankshaft of the Vee lend well to high RPM power and high redlines. The Vee fits crosswise better in a FWD car, (and in fact probably makes FWD practical) and in an RWD or 4WD, can be installed further back than an I-6 giving better balance to the vehicle's weight distribution. They are also cheaper to manufacture, and with all the legally required expensive safety and emmisions equipment, that matters.

The downsides of the Vee compared to the I is that the Vees are a bit more complicated due to replication of valve-train gear on each side of the engine, and the fact that they are not inherently balanced against vibration. A 60 degree V-6 is fairly vibration free, but benefits to have a counterbalance shaft, adding to complication. Because of the extra surface are of the relatively open V-6 design, they also lose a little more internal heat to the atmosphere, slightly reducing overall efficiency. The I-6 for mostly the opposite reasons as the V-6 tends to be built for low end torque, is a just little bit simpler, and is naturally balanced for smoothness...if a long hooded, relatively nose heavy vehicle is no issue.

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