So I was browsing Wikipedia earlier today looking at the third gen Ford Explorer for more details and I noticed the 4.0 in the 2002-2005 Explorer had 210 hp and 254 ft lbs of torque. This caused lights to go off in my head as I remember that the same year ranger has 207 hp and 238 ft lbs. Now this might just be because the person editing the article was looking at a source that used sae certified power instead of standard power testing or looked at an average number from people who had been to a dyno and just added 15-25% for drivetrain losses. My question is what is the difference between the 4.0 SOHC in the 01-10 Ranger and the 4.0 SOHC in the 03-05 Explorer? Is it a cam and exhaust or just a little hiccup in the Wiki? It would be nice to know if I could get more torque from an engine swap in case my Ranger’s engine bites the big one. Thanks for your help.

The Explorer’s Wikipedia entry.

The Ranger’s Wikipedia entry.

 

Yes, and the Mustangs 4.0l SOHC has slightly more than Ranger as well

Could be intake manifold runner length, not exhaust for sure

The 4.0l SOHC runs 9.7:1 compression ratio so in any vehicle with that engine you need to run 91 or 93 octane to get anywhere close to the claimed HP or torque, under that octane the knock sensor is active and reducing power

I think some people have said you can tune computer in Ranger 4.0l SOHC for Explorer numbers but never tried it myself