4.0 to 4.2 liter?

[lowsexplorer93]

Hello. Im looking at rebuilding my 4.0 from a 94 explorer. Im trying to find any info on boring the block and installing the 4.2 liter pistons. My brother inlaw did it with a 3.8 liter mustang. Just wondering if I could do the same with my 4.0. Has anyone ever done this before? Thanks guys.

 

[James86]

The 4.0 is a "cologne" design and the 3.8 is an "essex" design. Completely unrelated. The 3.8 and 4.2 are related to eachother, but not the 4.0.

 

[Twister]

Dont know how reputable this site is but they peddle a 4.0 stroker kit

http://www.moranav6racing.com/category.html?CategoryID=32

 

[whatelseisleft]

the 4.0 has a really long stroke as it is... i don't know that i'd want to go the stroker route... 4.0's already have a rev limiter set at about 4950 so if you stroke it you're gonna have to set the rev limiter even lower or risk blowing it to pieces... imo i'd stay away from a stroker on a 4.0...

 

[adsm08]

What exactly is your end goal here?

Are you after more power, better mileage, or in it for, as an old prof put it, "the engineering exercise"?

 

[lowsexplorer93]

Well my goal on this rebuild is more power. I tow alot and most of its freeway travel. Just wont the extra power. Thought that doing a piston up grade would help. But really dont want to end up with one of those 3 year projects, if you guys know what i mean.

 

[James86]

If you tow a lot, gearing might be a better solution.

 

[lowsexplorer93]

ya gearing would work. But a stoker kits just sounds way cooler. Just an idea. Might just do a basic rebuild.

 

[lowsexplorer93]

I was looking at this link, http://www.moranav6racing.com/catego...?CategoryID=32 They have some used flat top pistons for the explorer 4.0. They say it sould add 25-30hp. Any body ever go this route with a rebuild?

 

[AllanD]

The 4.0 is a "cologne" design and the 3.8 is an "essex" design. Completely unrelated. The 3.8 and 4.2 are related to eachother, but not the 4.0.

Please say "CANADIAN Essex" so as not to confuse it with the completely different and unrelated Ford of England Essex V6/

I was looking at this link, http://www.moranav6racing.com/catego...?CategoryID=32 They have some used flat top pistons for the explorer 4.0. They say it sould add 25-30hp. Any body ever go this route with a rebuild?

I'm sure they run great on Racing or aviation gasoline, for the rest of the world? no.

AD

 

[James86]

Please say "CANADIAN Essex" so as not to confuse it with the completely different and unrelated Ford of England Essex V6/
AD

From what I can see online, the British "Essex" stayed in England and the Canadian "Essex" was for North America. I guess it was sort of implied what I was referring to. Granted "Cologne" engines are made in Germany and used in the U.S., but Canadian "Essex" motors were what was used in the Mustang (in 3.8 form) and in the F-series as a 4.2 litre.