4 banger to v8 smart idea or no?

[raptor_pilot]

More Power!!!!!! Go with the more powerful engine.
Seriously, i think you should go with the 4.3. It's a quality engine that definitely puts out enough power to turn them wheels. But whatever is the cheapest in the long run. Dont think just now. But I sure wish I had a 4.3 Vortec instead of my stock 4.0!
Mike

 

[Junkpile]

Okay, okay.....put the bottle down and slowly back away.....haha.
I'm not gonna run the 4.3 into the ground because it really is a great engine, but it's no 4.0. I can modify an H.O. 4.0 to make all the horsepower that that 4.3 will, but you can't do squat to that 4.3 to make it match the torque of a built 4.0ish :wink: Jeep engine.

 

[Utah_jeepster]

One thing you havnt thought of here is what type of axles do you have under your jeep.
A V8 or even a V6 will apply alot more tourqe than your old 2.4...alot of articles say you should have a D44 in the rear minimum.
With gas expecting to shoot skywards 2$+ this summer as the price of sweet crude sky-rockets the gas effiecent 3.4 V6 will do you alot better than a V8.
Its tourqe here not high RPM's that get you through the tough rock sections.

 

[Junkpile]

Thanks

Yes, torque. A V6 will never match the torque output of an I6 or a larger V8, given the ability to achieve the same flow numbers per cylinder. It is physically impossible. A smaller engine has to operate at a higher rpm than a larger engine does to make the same amount of power. Any modification that you do to increase breathing in the upper RPMs where the smaller engine has to operate to do the job is almost always going to adversely affect the lower RPM torque production, where the smaller engine already has a large disadvantage.

Comparing the I6 to a V6 is apples and oranges. Just because of the long stroke that is dictated by the physical dimensions of an inline engine, an I6 will produce around 30% more torque than an equally sized V configuration engine, assuming equal flow per cylinder. On the flip side, a V engine will breath better on the top and usually produce a higher peak HP number, but with a narrower usable RPM range.