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Jeep Engine: 4.0L I6

 Jeep Engines 

287(4.7L) V8
360(5.9L) V8
318(5.2L) V8
242(4.0L) I6
150(2.5L) I4
173(2.8L) V6
GM 151 I4
AMC 401 V8
AMC 360 V8
AMC 304 V8
AMC 258 I6
AMC 232 I6
"Dauntless" 350 V8
"Dauntless" 225 V6
"Vigilante" 327 V8
"Tornado" 230 I6
Perkins 192 I4
"Hurricane" 226 I6
"Hurricane" 134 I4
"Go Devil" 134 I4

Engines

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The 4.0L inline 6 (I6) engine was introduced in the Cherokee in the late 80s and in the YJ in 1991. The cylinder design is based on the changes made to the fuel injected 2.5L I4 engine. The block and cylinder head are cast iron. It uses 7 main bearings and hydraulic lifters. The HP and torque gains are substantial over the older carbureted 258, but the peaks come at higher RPM. The fuel injected engine performs much better in off-camber, bouncy, and steep situations. It also calibrates better for changes in altitude. Fuel economy is also improved.

A good way to embarass yourself in front of your Jeeping friends is to refer to it as a V6. It isn't a V6, it is an inline 6 or I6. The "V" in V6 refers to the configuration of the pistons in the block. The only two V6 engines ever available from the factory in a Jeep are the 225 "Dauntless" Buick V6 in the late 60s and early 70s and the 2.8L GM V6 in 80s Cherokees and Comanches. If you are shopping for a Cherokee or Comanche, make sure you get the 4.0L and not the 2.8L engine, there is a world of difference.

The 4.0L engine used in the Wrangler from '91 until the present.

4.0L I6
Bore x Stroke3.88" x 3.41"
Displacement242 (4.0L)
Compression Ratio8.8:1
Horsepower (net)180@4750
Torque (net)220@4000
Main Bearings7
Valve ConfigurationOHV
FuelMPI

The 4.0L I6 that is used in the XJ and ZJ is rated slightly higher than the YJ and TJ 4.0L engine probably due to a different exhaust system.

4.0L I6
Bore x Stroke3.88" x 3.41"
Displacement242 (4.0L)
Compression Ratio8.8:1
Horsepower (net)185@4750
Torque (net)220@4000
Main Bearings7
Valve ConfigurationOHV
FuelMPI

Last modified Wednesday, 01-Dec-2010 08:33:34 MST


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