Which is better 4cylinder vs 6 cylinder - Page 2 - JeepForum.com
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post #16 of 18 Old 07-28-2013, 09:21 AM
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1989 YJ Wrangler 
Join Date: Nov 2010
Location: Sin City
Posts: 2,881
I drive the mighty 4 angry squirrels because that is what was in the YJ when I got it. Stock set up not bad in town a little slow on acceleration on the highway and off road very capable.

Modded with lift and 33s it is slow everywhere except the trail. Great torque off road but a gutless wonder on the highway. Solution re- gear from stock 4:10 to 4:88. $$$ for new gears had a master kit installed also and some lockers. D30 up front no problem. Swapped to an 8.8 rear for the strength.

Conclusion is if you have the choice up front go with the six or any of the bigger swaps available.

I love the YJ the way it is and we get along just fine were both slow and old. With re-gear we are now capable of keeping up with traffic and even better off road. MPG has never been a concern it's not a DD just a weekend warrior.

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
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post #17 of 18 Old 07-28-2013, 09:34 AM Thread Starter
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Join Date: Jul 2013
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After thinking about it I did end up getting myself an inline 6
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post #18 of 18 Old 07-28-2013, 10:57 AM
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2003 TJ Wrangler 
Join Date: Mar 2012
Location: Charlottesville
Posts: 242
I think you'll be happy with that inline 6. They are one of the great American engines that I wish were still made. An inline 6 is one of the few engine designs that is inherently balanced. They are very durable and have great low end torque, which translates into a good power-plant for a 4WD rig.

Stolen from Wikipedia, "The straight-six layout is the simplest engine layout that possesses both primary and secondary mechanical engine balance, resulting in much less vibration than engines with fewer cylinders."

Also shamelessly stolen from Wikipedia, "An inline six engine is in perfect primary and secondary mechanical balance, without the use of a balance shaft. The engine is in primary couple balance because the front and rear trio of cylinders are mirror images, and the pistons move in pairs (but of course, 360 out of phase and on different strokes of the 4-stroke cycle). That is, piston #1 mirrors #6, #2 mirrors #5, and #3 mirrors #4, largely eliminating the polar rocking motion that would otherwise result. Secondary imbalance is avoided because the crankshaft has six crank throws arranged in three planes offset at 120. The result is that the secondary forces that are caused by differences from purely sinusoidal motion sum to zero".

And one last bit of plagiarism from our friends at the wiki:
"The last in the line of the AMC inline sixes, the 4.0 is regarded as one of the best 4x4 off-road engines. A Motor Trend long-term test of a 1997 Cherokee XJ noted "this long-lived OHV powerplant has a reputation for getting people where they need to go" as well as "much love expressed by owners for the torquey 4.0-liter/190-horsepower inline six." The engine is known for longevity and to go more than 300,000 miles (482,803 km) without rebuilding."
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