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Old 07-27-2011, 09:12 PM
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3.6 VS 3.8 Questions

I am quite sure the new engine will be an improvement. However, I have noticed some things that puzzle me about the new engine. The photos I have seen show the oil pan to be quite different, and much lower than than the 3.8 oil pan. Last time I went off road, I put a dimple in my oil pan. Looks like you will need a tough skid pan for the new one.

Also I noticed that the alternator is mounted down low, whereas the old one was mounted up high out of reach of splashing water.

I have rebuilt several overhead valve engines. Chevy 350, Ford 351, 289 etc. Not much trouble. However, with the dual overhead cam and twenty four valves, some of us shade tree types might have trouble once they get down to us. I have done a cosworth four cylinder without much trouble. I thought about doing a Ford 5.4 single overhead cam, and backed out. Plus the new engine appears wider at the heads than a chevy small block.

Anyway I look forward to seeing how the new JKs do. I have an 07 Jk with 4.1gears, electric lockers, electric sway bar release, riding on 32 GY SA and I am going to wear it out before I trade or sell it, unless......the new one is really great.

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Old 07-27-2011, 09:24 PM   #2
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that puzzles me about the 3.6l engine also-

Those are several of the many reasons I got rid of my '06 Xterra OR--ie-low oilpan and the alternator was near the bottom--which made it susceptable to water/mud/debris aqnd hard to service-Aluminum front diff !

One of the reasons Corvettes have stayed for so long is the legendary Chev small block--lotta changes, but they pretty much stuck with the the basic-(cept for ECUs)-

We're not gonna know about this 3.6l/Wrangler combo for at least another year-

Keep eyes/ears/wallet--OPEN !

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Old 07-28-2011, 05:36 AM   #3
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We're not gonna know about this 3.6l/Wrangler combo for at least another year-

Keep eyes/ears/wallet--OPEN !

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That's why a lot of people wait a year. Even though the Pentastar engine is proven in the GC, it is new to the Wrangler. The alternator might find a new location in the 2013 model, along with other tweaks. Who knows

The alternator location seems pretty basic, I wonder why engineers left it down low in a vehicle that sees the use a Wrangler does?
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Old 07-28-2011, 08:08 AM   #4
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Yea, I think, maybe a clearance problem caused the low position--but

I say a year to find things out, because even though guys will be getting them in the next month, it'll probably take a year for more than ONE, to lift/tires/suspension change and thats not counting the pro's reports--selling things--

We'll have to wait !!

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Old 07-28-2011, 08:54 PM   #5
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I don't know where the idea of a bottom mounted alternator came from. Every pic I've seen has it mounted up high right in front of the engine.
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Old 07-28-2011, 09:02 PM   #6
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I don't know where the idea of a bottom mounted alternator came from. Every pic I've seen has it mounted up high right in front of the engine.


Here is a picture from another post showing the alt right where oilwell1415 said it was
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Old 07-28-2011, 09:08 PM   #7
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This is rediculous for me to even comment-cause I don't really care about this new engine-but


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Originally Posted by basecamper View Post


Here is a picture from another post showing the alt.
That doesn't look like the new 3.6L v6 Pentastar engine-for the jeep, if it is fine-this is my last entry-

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Old 07-28-2011, 09:35 PM   #8
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Yep it is it just has the big A$$ cover tilted up
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Old 07-29-2011, 06:01 AM   #9
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Sure looks like the alternator is where it belongs, at least on that engine.
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Old 07-29-2011, 06:18 AM   #10
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Well I'm new and buying soon. So do I get the 2012 or 2011?
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Old 07-29-2011, 06:22 AM   #11
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Well I'm new and buying soon. So do I get the 2012 or 2011?
I just picked up a 2011 Sahara and I didn't not want a first year engine so I was adamant about finding the 2011 model I wanted. I'm a happy camper now.
I got burned with a second year Ram 1500 4x4 when they came out. Nice truck but the wiring harness was it's downfall. Always had problems with it. I did get 125,000 from it before it died in the driveway.
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Old 07-29-2011, 06:28 AM   #12
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Well I'm new and buying soon. So do I get the 2012 or 2011?
My .$02...The extra HP would be nice. I would go for the 2012. If you are concerned with potential first year glitches perhaps wait a little while, but if you are ready to buy I would just take my chances.
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Old 07-29-2011, 07:20 AM   #13
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My .$02...The extra HP would be nice. I would go for the 2012. If you are concerned with potential first year glitches perhaps wait a little while, but if you are ready to buy I would just take my chances.
I'm going to lease for 3yrs but i will know in the first year if i will buy out. Wont they fix glitches then?
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Old 07-29-2011, 07:54 AM   #14
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That doesn't look like the new 3.6L v6 Pentastar engine-for the jeep, if it is fine-this is my last entry-
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That's a pic of a shiny new 2012 Wrangler.

Quote:
Originally Posted by Wirenuting View Post
I just picked up a 2011 Sahara and I didn't not want a first year engine so I was adamant about finding the 2011 model I wanted. I'm a happy camper now.
I got burned with a second year Ram 1500 4x4 when they came out. Nice truck but the wiring harness was it's downfall. Always had problems with it. I did get 125,000 from it before it died in the driveway.
I felt the same way when the dealer first suggested I just order a 2012. After some research I found that it isn't a first year engine, it's just the first year it's in the Wrangler. I spend days searching dealer inventory for exactly what I wanted in an '11 and it isn't out there, so a '12 works better for me anyway.

Being a second year model on the Ram probably didn't have anything to do with your problems. Those have been junk since they came out in '93 and unless the newest body style is better they've never really improved.
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Old 07-29-2011, 08:04 AM   #15
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Heh Heh, I lied, that wasn't my last entry--


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That's a pic of a shiny new 2012 Wrangler.



I felt the same way when the dealer first suggested I just order a 2012. After some research I found that it isn't a first year engine, it's just the first year it's in the Wrangler. I spend days searching dealer inventory for exactly what I wanted in an '11 and it isn't out there, so a '12 works better for me anyway.

Being a second year model on the Ram probably didn't have anything to do with your problems. Those have been junk since they came out in '93 and unless the newest body style is better they've never really improved.
I didn't know about the placement of the alternator and I was just using that comment to mention the position of the ALTERNATOR AT THE BOTTOM OF MY XTERRA V6--

Here again, I'm not interested in this 2012, so I'll just kinda keep out

Good day

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Old 07-29-2011, 08:10 AM   #16
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Heh Heh, I lied, that wasn't my last entry--




I didn't know about the placement of the alternator and I was just using that comment to mention the position of the ALTERNATOR AT THE BOTTOM OF MY XTERRA V6--

Here again, I'm not interested in this 2012, so I'll just kinda keep out

Good day

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My post wasn't directed at you, it was directed at OP who stated that it was mounted down low.
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Old 07-29-2011, 09:30 AM
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In the April 2011 JP Magazine on page 12 is a photo of the 3.6 engine. It must be the setup used in the GC, not Jeep. My mistake for thinking it was dressed out for the JK. Sorry about that!!!
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Old 07-29-2011, 09:35 AM   #18
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If you have the means, always buy the newer vehicle. Technology, power, fuel economy and features are all things they will always improve on.

Some people are supercharging their 3.8's. The 3.6 guys will be able to near those power levels with intake/exhaust mods and some tuning.
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Old 07-29-2011, 09:31 PM   #19
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I'm going to lease for 3yrs but i will know in the first year if i will buy out. Wont they fix glitches then?
It'll be under warranty so any problems you may have will be fixed...it's just the inconvenience if you have to take it in for repairs. I wouldn't bee too concerned- they use this engine in several other vehicles.

Then again...the other side of the coin is you might save some money by getting a 2011. Maybe test drive them both and see if the extra power is worth the extra $$. I was just reading this thread and the initial reviews aren't earth shattering. As someone states in this thread- the 80 hp gain is only up in the high RPM range. If that is true it might not be that noticeable of a difference.

So...I guess I have been no help at all! I'm not all that decisive!
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Old 07-29-2011, 10:14 PM   #20
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Quote:
Originally Posted by JPWheelin

It'll be under warranty so any problems you may have will be fixed...it's just the inconvenience if you have to take it in for repairs. I wouldn't bee too concerned- they use this engine in several other vehicles.

Then again...the other side of the coin is you might save some money by getting a 2011. Maybe test drive them both and see if the extra power is worth the extra $$. I was just reading this thread and the initial reviews aren't earth shattering. As someone states in this thread- the 80 hp gain is only up in the high RPM range. If that is true it might not be that noticeable of a difference.

So...I guess I have been no help at all! I'm not all that decisive!
This^
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Old 07-31-2011, 07:34 PM   #21
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Looking to order a new '12 but can only afford an unlimited sahara. Rubicon would be pushing the comfort zone on payments. My dealer has '11 unlim Rubicon at a nice price. Is this new engine worth taking a step down? Ive heard on some forums that the front dana 44 isnt that much better than a stock dana 30 and that the lockers arent that strong either. I would eventually run 35s

what do u think?
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Old 07-31-2011, 08:54 PM   #22
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Looking to order a new '12 but can only afford an unlimited sahara. Rubicon would be pushing the comfort zone on payments. My dealer has '11 unlim Rubicon at a nice price. Is this new engine worth taking a step down? Ive heard on some forums that the front dana 44 isnt that much better than a stock dana 30 and that the lockers arent that strong either. I would eventually run 35s

what do u think?
I'm biased but, I'd go with the Rubi
Don't know what that 12 has for gearing. The rubi has 4:10's. If you plan on 35's you won't have to regear if money is an issue.
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Old 07-31-2011, 09:13 PM   #23
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Its also not just the better engine as why I am interested in the '12. Its the 5 speed w/ different gearing so w/ the 4.10s it is like a pre'12 w/ 4.88s. Also, for me(I have a '10) I like the new interior and chance to get a color matched top on Rubi. It also looks like a DS may be further from the tranny pan, meaning no need to replace DS w/ 3+" of lift. As much as I am on board w/ the '12. I won't order til I drive one... You never know, it may suck ass.... but I doubt it.
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Old 07-31-2011, 10:45 PM   #24
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gearing wise the '12 rubi comes with 3.73 upgrades to 4.10 with tow package. I would be getting the 6sp man so the new auto trans is not an issue.
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Old 08-01-2011, 06:08 AM   #25
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It'll be under warranty so any problems you may have will be fixed...it's just the inconvenience if you have to take it in for repairs. I wouldn't bee too concerned- they use this engine in several other vehicles.

Then again...the other side of the coin is you might save some money by getting a 2011. Maybe test drive them both and see if the extra power is worth the extra $$. I was just reading this thread and the initial reviews aren't earth shattering. As someone states in this thread- the 80 hp gain is only up in the high RPM range. If that is true it might not be that noticeable of a difference.

So...I guess I have been no help at all! I'm not all that decisive!
Everything I read here and get commented on. It helps me a lot. I plain on knowing a lot by time I get my jeep. As well as have some Jeep friends before I have it. I love how everyone helps each other out. My wife makes fun of me because I am on this forum and don’t have a Jeep yet. She just doesn’t get it. Thank you a lot.
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Old 08-01-2011, 08:20 AM   #26
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My wife just bought a 2011 Caravan R/T with the 3.6. I did some research on it, and it is one sophisticated,tough engine. This thing has six bolt main bearings! Should hold up rather well I would say. That being said I bought an '11 Wrangler cause I am impatient.
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Old 08-01-2011, 02:03 PM   #27
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Hopefully, the new engine will be a home run and everyone will be happy with the changes. However, it IS more complex than the older 3.8 with light weight pressure cast aluminum block, variable valve timing and over head cams (fewer parts - but more complex systems/components).

You can remove the upper end of the old engine in an afternoon and supposedly even replace rods and pistons if needed with the engine in place. The new engine with rear cam chains will have to be removed from the Jeep for any major repairs and will require special tools to set cam timing at a minimum. Maybe the technicians at your dealership are more skilled than those at mine?

Some of us like the simplicity and durability of the 3.8 (when built properly). And, a simple re-gear will solve many (most?) performance issues.
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Old 08-01-2011, 02:16 PM   #28
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COURTS ADJURNED, WITH ANOTHER WIN COUNSLER !!


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Hopefully, the new engine will be a home run and everyone will be happy with the changes. However, it IS more complex than the older 3.8 with light weight pressure cast aluminum block, variable valve timing and over head cams (fewer parts - but more complex systems/components).

You can remove the upper end of the old engine in an afternoon and supposedly even replace rods and pistons if needed with the engine in place. The new engine with rear cam chains will have to be removed from the Jeep for any major repairs and will require special tools to set cam timing at a minimum. Maybe the technicians at your dealership are more skilled than those at mine?

Some of us like the simplicity and durability of the 3.8 (when built properly). And, a simple re-gear will solve many (most?) performance issues.
Kinda like Harmon Rabb in J.A.G. -

My favorite--Heh Heh, probably because of Major McKenzie (Catherine Bell)

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Old 08-01-2011, 03:38 PM   #29
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My favorite--Heh Heh, probably because of Major McKenzie (Catherine Bell)

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Old 08-01-2011, 04:05 PM   #30
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Until we see how these 3.6 motors stand the test of time how can we brag about how tough or great they are? Once they have been out in the public for 5 or more years we will see. I remember some other high performance motors in the past that when there was a problem the entire motor got sent back to the company. Dealers weren't allowed to touch it. For Chrysler's sake I really hope the Pentastar lives up to all the hype and proves very durable. They really put a lot of eggs in the basket on this one. By putting it in so many different vehicles so soon shows they have good faith in it. If it doesn't live up to it expectations it could really hurt them financially.

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