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Old 09-29-2012, 12:17 AM   #31
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Quote:
Originally Posted by blackrubi003 View Post
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.
So true, car sales would plummet. a lot of people feel like 100k miles is near the end of the life their car and go buy a new one...

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Old 09-29-2012, 08:47 AM   #32
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Quote:
Originally Posted by ninjaturtle0

So true, car sales would plummet. a lot of people feel like 100k miles is near the end of the life their car and go buy a new one...


Newer engines easily last 300k, or at least 200k. The longevity of the I6 was remarkable at the time, but not so much now.

The 100k "my engine is old" mark for most folks comes from years ago when that was actually getting pretty long in the tooth for an engine. Like how everybody does oil changes at 3k. But nowadays 100k is pretty inconsequential on a reasonably well maintained engine.

I would not speculate that predictions of engine longevity would lead to a sales drop of new vehicles. Indeed, in blkrubi003's own example, he's owned 5 I6s despite the fact one would have likely lasted for that whole time. Hardly anybody gets a newer vehicle because of an actual engine issue with their old one--folks just "want something new" and can afford it. That's what drives new vehicle sales.

The I6 was outdated from a fuel efficiency and emissions standpoint. It was also pretty underpowered for a vehicle bigger than a TJ. On top of that, the industry was moving to V6 engines, which take up less space in the vehicle, and it was inefficient to produce an engine just for a single vehicle. Hence, the I6 was retired.

Still a great engine though.

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Old 09-29-2012, 09:49 AM   #33
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^^^As said, (and as I said in my post before). I love my I-6, but there are pros and cons to both designs. I can understand the industry shift, and it's not to give you a crappy, short-lived engine to keep you coming back for more crappy-short-lived engined vehicles.
Just because I have and love an I-6 doesn't mean I'm going to be excessively biased towards them to the exclusion of engineering reality. Just my 2 cents worth.
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Old 09-29-2012, 03:43 PM   #34
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Not a 4.0 but I have an 81' F-150 custom back at home with the 300 I6 in it and that little beast has taken me places I never thought a 2WD would go. The amount of torque she puts out is pretty dang impressive, granted she needs a little work to get her all up to speed after a little negligence since he purchase of my Jeep. But those engines are as before mentioned "bullet proof". My old man has a crate 302 BOSS that he said he would give me if I managed to blow my 300, I immediately went out and drove that thing like i stole it and she took it all with a smile, probably won't ever get rid of that truck!
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Old 09-29-2012, 09:30 PM   #35
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Like I said, the technology is there to get 70mpg on a 70s model Buick, well over 120mpg in todays cars. Engine efficiency or emissions has NOTHING to do with it at all. It is about mounting the engine transversely, so you can put the same motor in the sedan and minivan and suv, after all they come from the same unibody "chassis". Then there is 1 plant, making 1 engine. Much easier (and more profitable) from a manufacturer viewpoint. Its just good ol fashion capatalism.

The I6 can move a 96 land crusher, Im pretty sure it could handle a tj, or jk for that matter. It does require a larger hood/car, which costs more to make.

And if y'all are sayin duty cycle has nothing to do with longevity, youre missing the picture entirely of friction and physics.
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Old 09-29-2012, 10:36 PM   #36
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Duty cycle means how long something is running vs not running. I don't get it?
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Old 09-30-2012, 06:25 PM   #37
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Quote:
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Duty cycle means how long something is running vs not running. I don't get it?
Duty cycle can mean ocillating (on off cycles) or % of motor used, maybe engineers call it somethin else. Ive heard it reffered to those way my whole life.

For instance a 50% duty cycle would mean it is on 5 min out of 10 with say a welder, yet an engine at a 50% duty cycle is operating at 50% power 100% of the time.

Either way you verb it, the more towards high end operating extremes you run anything, the shorter the life will be compared to a similar "anything" operated in the mid or low end of its range. There are some exceptions, like diesel generators that'll run wet, but not cars. It's a friction thing - friction (motion) is the enemy of the internal combustion engine.
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Old 09-30-2012, 07:06 PM   #38
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Oh. I never heard it in that context, like whipping a little 4 banger all the time to keep up with traffic. Surprised those last as long as they do. I guess it's all in the sturdiness of the design and good lube flow.
One down side of long stroke motors though, is the tendency for higher piston speed against the cylinder walls. But they seem to hold up well even so.

Oh well. They're gone so it's a moot point. I think the new 3.6L V-6 is going to be a good engine, but I love the sound of my old I-6.
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Old 09-30-2012, 08:24 PM   #39
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Originally Posted by Blind Dog
Oh. I never heard it in that context, like whipping a little 4 banger all the time to keep up with traffic...
Yup, exactly. It may be the wrong terminology, but thats what Im talking about. Not to say that 4 banger wont go a zillion miles, only that a similar engine run at 2k all the time would go 5 zillion very slow underpowered miles.
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Old 09-30-2012, 08:58 PM   #40
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my old cherokee had the I6 and it was great. never leaked, never had any problem with engine or trans. plus it seemed to have alot more "get up and go" then my 2010 wrangler. but so far so good on the v6. just depends if you want new or old.
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Old 10-01-2012, 08:52 AM   #41
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Yep. If you're getting almost anything (almost any car, any brand) new, you're getting an I-4, V-6, or V-8 and they are fine and great...but that's what you're getting. (I think even BMW is dropping the I-6 they used for so long.) Pros and cons to every cylinder arrangement, but they are still a 6, and basically all work the same way.

(One exception: My wife has one of those Subaru Outbacks with the 2.5L opposed H-4 though--and boy it pulls nicely, even in the mountains, and idles smooth as silk. May be the nicest running 4 I've personally driven. Naturally balanced by layout.)
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Old 10-01-2012, 05:32 PM   #42
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Whats up with all the 2.5l haters. Mine gets me places and then some albiet not super fast but hey its a jeep slow down and enjoy the outdoors. My uncles Samurai i think it's a 1.3? or 1.8 not sure that thing is a beast on 33's. I love my 2.5l LO.
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Old 10-01-2012, 07:52 PM   #43
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Whats up with all the 2.5l haters.
Where? On this forum?
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Old 10-01-2012, 08:00 PM   #44
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Whats up with all the 2.5l haters. Mine gets me places and then some albiet not super fast but hey its a jeep slow down and enjoy the outdoors. My uncles Samurai i think it's a 1.3? or 1.8 not sure that thing is a beast on 33's. I love my 2.5l LO.
I see way more 3.8 haters than 2.4/2.5 haters.
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Old 10-01-2012, 08:50 PM   #45
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Quote:
Originally Posted by Blind Dog
Where? On this forum?
I was reading the previous posts on this thread
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Old 10-02-2012, 08:04 PM   #46
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I was reading the previous posts on this thread
Oh yeah, I guess there's some that don't like them here. I think they're OK. I've owned a ton of 4 bangers on small or mid-size trucks and various cars, just never a Jeep yet.
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Old 10-02-2012, 08:25 PM   #47
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I put 145k on a (non jeep) 4 banger in 11 years, whipped those squrrils(?) all over the Southeast. Nothing against em at all. I dont like the current industry practices by car (and many other) companies.

The I6 is just a better engine, but the I4 is its effecient little brother. Where ya think the I4 came from??? Mix of I6 design and V piston movement.

I saw 2 or so posts particular to jeep 4 bangers. Idk about that motor, so I cant speculate. But if there is an I6 option, WHY would you not get it?

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