• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

4.0 to 4.2 liter?


lowsexplorer93

New Member
Joined
Dec 19, 2008
Messages
8
Reaction score
0
Points
0
Transmission
Automatic
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

James86

New Member
Joined
May 6, 2009
Messages
889
Reaction score
10
Points
0
Location
55381, Minnesota
Vehicle Year
1999,
2012,
Make / Model
Ford,
Ford,
Engine Size
3.0 Flex Fuel, 2.5L, 3.3 Flex Fuel
Transmission
Automatic
My credo
WHY DO I KEEP BUYING DODGES?!?!?
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.
 
whatelseisleft

whatelseisleft

Member
Joined
Dec 12, 2010
Messages
93
Reaction score
2
Points
8
Vehicle Year
1987
2005
Make / Model
ford
mazda
Engine Size
2.9 for now
Transmission
Manual
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

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,623
Reaction score
3,613
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
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

New Member
Joined
Dec 19, 2008
Messages
8
Reaction score
0
Points
0
Transmission
Automatic
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

James86

New Member
Joined
May 6, 2009
Messages
889
Reaction score
10
Points
0
Location
55381, Minnesota
Vehicle Year
1999,
2012,
Make / Model
Ford,
Ford,
Engine Size
3.0 Flex Fuel, 2.5L, 3.3 Flex Fuel
Transmission
Automatic
My credo
WHY DO I KEEP BUYING DODGES?!?!?
If you tow a lot, gearing might be a better solution.
 

lowsexplorer93

New Member
Joined
Dec 19, 2008
Messages
8
Reaction score
0
Points
0
Transmission
Automatic
ya gearing would work. But a stoker kits just sounds way cooler. Just an idea. Might just do a basic rebuild.
 

AllanD

TRS Technical Staff
TRS Technical Advisor
Joined
Jun 1, 2001
Messages
7,897
Reaction score
134
Points
63
Age
62
Location
East-Central Pennsylvania
Vehicle Year
1987... sorta
Make / Model
Ford
Engine Size
'93 4.0
Transmission
Manual
James86 said:
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.
Click to expand...
Please say "CANADIAN Essex" so as not to confuse it with the completely different and unrelated Ford of England Essex V6/


lowsexplorer93 said:
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?
Click to expand...
I'm sure they run great on Racing or aviation gasoline, for the rest of the world? no.

AD
 
James86

James86

New Member
Joined
May 6, 2009
Messages
889
Reaction score
10
Points
0
Location
55381, Minnesota
Vehicle Year
1999,
2012,
Make / Model
Ford,
Ford,
Engine Size
3.0 Flex Fuel, 2.5L, 3.3 Flex Fuel
Transmission
Automatic
My credo
WHY DO I KEEP BUYING DODGES?!?!?
AllanD said:
Please say "CANADIAN Essex" so as not to confuse it with the completely different and unrelated Ford of England Essex V6/
AD
Click to expand...
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.
 
You must log in or register to reply here.

Sponsored Ad


Sponsored Ad

Staff online

Members online

Total: 1,145 (members: 8, guests: 1,137)

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Latest posts

Truck of The Month


Shran
April Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

Latest Album Photos

Hunters
20240409_190831.jpg
20240409_190818.jpg
20240409_180824.jpg
20240409_182648.jpg
20240409_181010.jpg
20240408_175026.jpg
99 Ranger
20200706_161414.jpg
20240207_155117.jpg
20240207_155111.jpg
20240207_154537 - Copy.jpg

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top