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Unread 02-25-2012, 06:58 PM   #1
d_rehmann
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5.2 Magnum in 2007 Unlimited?

Hi JeepForum,

First poster here. I joined because I am in the process of purchasing a 2007 Jeep Sport Unlimited 4 door. I was looking at my truck that was in an accident the other day and started thinking. I really like the motor, its a 5.2 Magnum out of a '99 Dodge Ram, that only has 95,000 miles. I was curiously wondering what you guys think of doing a motor swap like this.

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Unread 02-26-2012, 09:00 AM   #2
churchofjt
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The 99 5.2 was rated for 220HP/295Ft/lbs. The 2007 3.8 V6 in the JK was 202/237. That seems like a lot of work for something that isn't going to be putting out at least 300 horse and 350 ft/lbs. Also, no idea about VA, but that swap is not going to be emissions legal in some states. I'm afraid you'd be better off doing a hemi swap if anything. Or better yet, wait a year and buy a 2012 JK with the 3.6.
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Unread 02-26-2012, 09:53 AM   #3
GraKee99
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It is illegial to swap a motor older than your current vehicle year so if you have inspection, you won't pass. And I agree with churchofjt, not worth the effort. Either supercharge the 3.8 or swap a Hemi.
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Unread 02-26-2012, 10:08 AM   #4
ratmonkey
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Many emissions states also specify that the motor can not be one that wasn't offered as oem that year.
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Unread 02-26-2012, 10:14 AM   #5
d_rehmann
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Wow, I did not even think about inspection and such. The reason I was curious is because of the extra two cylinders. It pulls pretty hard. Like I said, I was just curious. Thanks for the help!
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Unread 03-02-2012, 02:49 PM   #6
AndrewBu
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better swap for u would be a hemi swap
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Unread 03-11-2012, 09:01 AM   #7
greenmachine99
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Would you be interested in selling the motor? I'm in md and looking for a motor swap for my 99. You'd be better of with a hemi.
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Unread 03-14-2012, 09:52 AM   #8
tantan123
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I did not even think about inspection and such.
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Unread 03-14-2012, 02:23 PM   #9
Wheelin98TJ
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Quote:
Originally Posted by churchofjt View Post
The 99 5.2 was rated for 220HP/295Ft/lbs. The 2007 3.8 V6 in the JK was 202/237. That seems like a lot of work for something that isn't going to be putting out at least 300 horse and 350 ft/lbs. Also, no idea about VA, but that swap is not going to be emissions legal in some states. I'm afraid you'd be better off doing a hemi swap if anything. Or better yet, wait a year and buy a 2012 JK with the 3.6.
Sometimes the #s don't tell everything.

I have a little 4.7 V8 in my TJ and its a night and day difference compared to the 4.0 I6 it replaced.

The 4.7 V8 is only 235 HP and 295 ft/lbs.

The key difference is the 4.7 V8 makes more torque at 1,200 RPM than the 4.0 I6 does at its peak.

And it sounds better.

But at the same time, I can agree with what your saying. Here I am 2 years or so after the swap and I think I could use a little more power.
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Unread 03-14-2012, 03:08 PM   #10
Mike128
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I have a 5.2 magnum motor sitting in an old Dodge truck also so I've been toying with this idea. Need to get one project done first but I also hae some questions.

Doesn't the 5.2 take upgrades well? Meaning even though stock it gets 225/295, it can be tweaked to do much more? How is the aftermarket on the 5.2? How much more power does the Hemi have than the magnum.

I think those would also make a difference to see if it's worth it to do the swap. No matter what, it's going to take a lot of money.
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Unread 03-14-2012, 06:16 PM   #11
ratmonkey
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Dodge motor aftermarket parts are always priced about double the comparable Chevy or Ford items.
You can make one heck of a Mopar magnum motor (I've got a 408 long block looking for a home.)
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Unread 04-01-2012, 11:11 AM   #12
dusterdude
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You can bring it to my home...lol
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