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A look at the evolution of the MJ Engine


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I've compiled some interesting specifications for the various engines used in the Comanche.


Here's the history of the Comanche Engine...



Two gasoline engines offered, Inline-4 and V-6.


Very little historical information found in news articles about the 1986 Turbo-Diesel, but it is mentioned.


4 cylinder 250 cubic inch (2.5 L)

117 hp @ 5,000 rpm

135 ft-lb torque @ 3,500 rpm

24/27 mpg


6 cylinder 2.8L (V6)

150 ft/lb of torque @ ??? RPM

17/22 mpg



The I-4 remains the same, but gains hp and torque due to a larger air cleaner.

The V6 is replaced with a 4.0L Inline-6.

So, could 1986 I-4 owners gain hp and torque by swapping in the 1987 air cleaner?


4 cylinder 2.5L

121 hp @ 5,000 rpm

141 ft/lb of torque @ 3,500 rpm


6 cylinder 4.0L

173 hp @ 4,500 rpm (NOTE: A 1991 article states that the 1990 engine had 177 hp. It is believed this was a misprint)

220 ft/lb of torque @ 2,500 rpm



Both I-4 and I-6 receive upgrades.


4 Cylinder 2.5L

126 hp @ 5250 RPM

148 ft/lb torque @ 3000 RPM

Multi-point fuel injection system (previous years were throttle-body fuel injection).


6 Cylinder 4.0L

190 hp @ 4750 RPM

225 ft/lb torque @ 4000 RPM

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You say, aside from the air cleaner that there are no differences between the 86 and 87 4 cylinders. I thought the 86 was carbureted?


no. the 84-85 were carbureted...so that was only in the cherokee and cherokee wagoneer.

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