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post #1 of 10 Old 12-31-2006, 09:00 PM Thread Starter
Wolfman01
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4.0 engines

1997 4.0L HO engine vs. 1998 4.0 engine.

Back when I bought my 98 Cherokee, I had also purchased a 1997 Cherokee with the 4.0 "high output" engine. While I don't have the '97 anymore, what is the difference, if any between the two, and what are the HP/torque specs? TIA.


1994 Safari Sarengeti 37' DP RV (92K)
1995 Daihatsu Hijet (82K Km's)
1997 Ford F150 (164K)
1998 Jeep Cherokee SE (154k)
2006 Chevy Aveo LS (28k)
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post #2 of 10 Old 12-31-2006, 11:05 PM
Chris_Walker
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It pretty much is the same HP and Torque, except that Chrysler made the exhaust ports on 98+ 4.0's itty bitty so it would be more environmentally friendly.
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post #3 of 10 Old 01-01-2007, 08:30 AM
dyna
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4.0L I6
Bore x Stroke 3.88" x 3.41"
Displacement 242 (4.0L)
Compression Ratio 8.8:1
Horsepower (net) 180@4750
Torque (net) 220@4000
Main Bearings 7
Valve Configuration OHV
Fuel MPI


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 Stroke 3.88" x 3.41"
Displacement 242 (4.0L)
Compression Ratio 8.8:1
Horsepower (net) 185@4750
Torque (net) 220@4000
Main Bearings 7
Valve Configuration OHV
Fuel MPI
The Jeep 4.0 litre I6 engine is a pushrod overhead valve design with 2-valves/cylinder. The factory power ratings are as follows:

'87...... XJ: 173hp at 4500rpm, 220lbft @ 2500rpm, redline 5000rpm
'88-'90 XJ: 177hp at 4500rpm, 224lbft at 2400rpm, redline 5000rpm
'91-'95 XJ: 190hp at 4750rpm, 225lbft at 3950rpm, redline 5250rpm
'96-'99 XJ: 190hp at 4600rpm, 225lbft at 3000rpm, redline 5300rpm
'00-'01 XJ: 193hp at 4600rpm, 231lbft at 3000rpm, redline 5300rpm

'91-'95 YJ: 180hp @ 4750rpm, 220lbft @ 3950rpm, redline 5250rpm
'96-'99 TJ: 181hp @ 4600rpm, 222lbft @ 2800rpm, redline 5300rpm
'00-'06 TJ: 190hp @ 4600rpm, 235lbft @ 3200rpm, redline 5300rpm

'93-'95 ZJ: 190hp @ 4750rpm, 225lbft @ 3950rpm, redline 5250rpm
'96-'98 ZJ: 185hp @ 4600rpm, 220lbft @ 2400rpm, redline 5300rpm
'99-'05WJ:195hp @ 4600rpm, 230lbft @ 3000rpm, redline 5300rpm


This is a bit from "jeeptech" pages. Yes the HO made more ponies
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post #4 of 10 Old 01-01-2007, 03:10 PM Thread Starter
Wolfman01
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Quote:
Originally Posted by dyna
4.0L I6
Bore x Stroke 3.88" x 3.41"
Displacement 242 (4.0L)
Compression Ratio 8.8:1
Horsepower (net) 180@4750
Torque (net) 220@4000
Main Bearings 7
Valve Configuration OHV
Fuel MPI


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 Stroke 3.88" x 3.41"
Displacement 242 (4.0L)
Compression Ratio 8.8:1
Horsepower (net) 185@4750
Torque (net) 220@4000
Main Bearings 7
Valve Configuration OHV
Fuel MPI
The Jeep 4.0 litre I6 engine is a pushrod overhead valve design with 2-valves/cylinder. The factory power ratings are as follows:

'87...... XJ: 173hp at 4500rpm, 220lbft @ 2500rpm, redline 5000rpm
'88-'90 XJ: 177hp at 4500rpm, 224lbft at 2400rpm, redline 5000rpm
'91-'95 XJ: 190hp at 4750rpm, 225lbft at 3950rpm, redline 5250rpm
'96-'99 XJ: 190hp at 4600rpm, 225lbft at 3000rpm, redline 5300rpm
'00-'01 XJ: 193hp at 4600rpm, 231lbft at 3000rpm, redline 5300rpm

'91-'95 YJ: 180hp @ 4750rpm, 220lbft @ 3950rpm, redline 5250rpm
'96-'99 TJ: 181hp @ 4600rpm, 222lbft @ 2800rpm, redline 5300rpm
'00-'06 TJ: 190hp @ 4600rpm, 235lbft @ 3200rpm, redline 5300rpm

'93-'95 ZJ: 190hp @ 4750rpm, 225lbft @ 3950rpm, redline 5250rpm
'96-'98 ZJ: 185hp @ 4600rpm, 220lbft @ 2400rpm, redline 5300rpm
'99-'05WJ:195hp @ 4600rpm, 230lbft @ 3000rpm, redline 5300rpm


This is a bit from "jeeptech" pages. Yes the HO made more ponies

Thanx. This is exactly what I was looking for.

1994 Safari Sarengeti 37' DP RV (92K)
1995 Daihatsu Hijet (82K Km's)
1997 Ford F150 (164K)
1998 Jeep Cherokee SE (154k)
2006 Chevy Aveo LS (28k)
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post #5 of 10 Old 06-29-2007, 03:14 PM
BassPlayer
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Quote:
Originally Posted by Wolfman01
Thanx. This is exactly what I was looking for.
This was exactly what I was wondering, I own a 1997 Jeep Cherokee 4.0 Litre "High Output" model myself, and am wondering how much horsepower I should be getting, 180 or 185? Or more?
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post #6 of 10 Old 06-29-2007, 03:15 PM
curtjames37
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Quote:
Originally Posted by BassPlayer
This was exactly what I was wondering, I own a 1997 Jeep Cherokee 4.0 Litre "High Output" model myself, and am wondering how much horsepower I should be getting, 180 or 185? Or more?
Should be making 190 according to stock specs.
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post #7 of 10 Old 06-29-2007, 03:53 PM
alexrule123
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Quote:
Originally Posted by C.Walker
It pretty much is the same HP and Torque, except that Chrysler made the exhaust ports on 98+ 4.0's itty bitty so it would be more environmentally friendly.
actually i believe it was from 99+. since in 99 they came out with the new intake manifold

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post #8 of 10 Old 06-13-2016, 09:11 AM
USMC6700
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i have a problem with a 98 model runs fine for a short while then it starts loading up
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post #9 of 10 Old 06-14-2016, 07:42 PM
jordan96xj
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Quote:
Originally Posted by USMC6700 View Post
i have a problem with a 98 model runs fine for a short while then it starts loading up
This is not a lot of detail to go on. Often when a short period of good running after start is followed by decreased performance it points to oxygen sensors that are failing or feeding bad signals to the computer. Causing the engine air/fuel mixture to get improperly adjusted. It runs fine at first because the computer ignores them until they are warmed up (several minutes).

An OBD2 scan tool with live data will show O2 sensor voltages and fuel trim numbers to help diagnose. If you don't have this type of gear, a shop can normally diagnose these types of issues pretty efficiently.

Things I keep around that help fix Jeeps:
AeroKroil and Fluid Film
BAFX Products 34t5 Bluetooth OBDII Scan Tool and Torque Pro OBD2 App for Android
Etekcity MSR-P600 Digital Multimeter
Bernzomatic TS4000 Trigger Start Torch + MAP Gas
1/2 inch sockets, Breaker, Cheater Pipe, and BFH
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post #10 of 10 Old 06-15-2016, 05:17 AM
75SV1
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The 4.0L was the same from 96 to late 99. I don't know when the smaller ports came. If it has the distributor less ignition, then it has the smaller ports. I think the difference between the 97s and 98s is in the transmission. There were some sensor and electronics upgrades starting in '98 in the trans. There are two speed sensors in the '98. I think only one in the 97 and earlier. They are different. '00 they upgraded the solenoids.
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