A look at the evolution of the MJ Engine

[beepbeepmyredjeep]

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

 

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

 

1986:

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

 

1987-1990:

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

 

1991-1992:

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

[JeepcoMJ]

I own an 86 turbo diesel MJ :thumbsup: :banana:

 

neener neener

[mvusse]

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?

[JeepcoMJ]

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.

[beepbeepmyredjeep]

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?

That's what I found from this newspaper article:

http://news.google.com/newspapers?id=jWoeAAAAIBAJ&sjid=3WkEAAAAIBAJ&dq=jeep%20comanche&pg=2538%2C1254657