4.0L to a 4.6L or 5.4L

[Mill1978]

I have a 2004 Mercury Mountaineer awd and was thinking of swaping the motor to a V8....I was wondering if this was possible.....Thanks in advance

 

[thepotroast]

Sure, people do swaps all the time, and the Explorer/Mounty is no different

You would be upgrading to the 4.6L since that is the option motor for your truck. A 5.4L is not an option, and therefore you would be swapping a lot more than just the motor...

There's more to the swap than just putting in the new engine, I would suggest doing some extensive searching on here, lots of good info about engine swaps

 

[Mill1978]

Can I use a aviator motor or a cobra mustang motor.......?

 

[Curtis]

Can I use a aviator motor or a cobra mustang motor.......?

You're thinking ambitiously!

Yes, they will physically fit.. but those motors are 3v heads I believe.. (4v heads on the cobra?)
All electronics are different. Computers, sensors etc.
Aviators require Premium full so there may be a fuel system upgrade too.
Some exhaust work will be required too.

as for the 5.4 I think I read on here that its external dimensions are almost the same as the 4.6 but its a little taller, again much more than just the motor will need to be changed.

With the money you'd invest in this swap, I recommend selling the 4.0 and buying one with a 4.6 already, a much better starting point.

 

[Mill1978]

I wouldnt have this problem if ford had of release the tremor..........I dont want a srt 8 jeep or ss tb...

 

[King of So Cal]

Just buy a new truck with a 4.6

 

[Mill1978]

Ill still have to mod it even if I buy a new one so it my cost me the same

 

[King of So Cal]

Yea but if you ever decide to sell it someday it wont be worth as much if it has a different motor then stock.

 

[Mill1978]

True True.......damn maybe Ill just get a FX45

 

[zerodevil]

the 5.4L WILL FIT, and WILL BOLT RIGHT UP. This swap is possibly but not as cheap as youd like to think, you will need a new wiring harness, new fuel lines (return style), and possibly a new computer. this goes for all of the 4.6L's and the 5.4L.