Just stroking?

[53guy]

I've heard much talk and much discussion on the subject of Boring AND Stroking the 4.0L. Does boring the motor actually give any true increase in the displacement over just stroking it? As far as liters go, what's the most you could just stroke the 4.0 to? Would it just be a simple rebuild at that point with a different crank and rods? What do you all that have these motors think? The reason I ask, is that I'm trying to stay away from boring the motor. I've always just stroked other motors with excellent results and have always left boring the cylinders to blocks that had cylinder wall damage. So is boring the 4.0L a neccessary step in making a stronger motor?

 

[2001XJeep]

Boring is not necessary to stroke a 4.0. Just stroking it will produce a 4.5L. Most times you hear about a bore and stroke because most times an engine needs an overhaul by the time it gets to the stage where the owner thinks about stroking it. If your cylinders don't need it then just give them a good hone and save the bore job for later in it's life when it's necessary.

As for strength, not boring will keep it stronger. Thicker cylinder walls = more strength/rigidity.

 

[Dr. Dyno]

You'll find all you need to know and some about stroking the Jeep 4.0 I6 in these sites:

http://www.angelfire.com/my/fan/stroker.html
http://www.jeep4.0performance.4mg.com/stroker.html
_________________________
1992 XJ Laredo 4-dr - 198k miles - 24k miles on 4.6L HO Stroker
AX15, NP231, D35c, D30

270hp@4950/327lbft@3750, 1/4 mile = [email protected], 0-60 = 5.6secs
Websites - Jeep 4.0 Performance, 4.6L Stroker Build-Up, Dino's Jeep Tricks

 

[53guy]

That's what I was hoping to hear. I really appreciate it. 4.5L is good enough for me. Appreciate the help!