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Unread 12-31-2006, 09:00 PM   #1
Wolfman01
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Location: Paradise, TX
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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.

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Unread 12-31-2006, 11:05 PM   #2
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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Unread 01-01-2007, 08:30 AM   #3
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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Unread 01-01-2007, 03:10 PM   #4
Wolfman01
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Join Date: Dec 2006
Location: Paradise, TX
Posts: 97
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.
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1994 Safari Sarengeti 37' DP RV (92K)
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1997 Ford F150 (164K)
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Unread 06-29-2007, 03:14 PM   #5
BassPlayer
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Join Date: May 2007
Location: Cheshire CT, USA
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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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Unread 06-29-2007, 03:15 PM   #6
curtjames37
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1998 XJ Cherokee 
 
Join Date: Aug 2006
Location: Oklahoma City, OK
Posts: 486
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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Unread 06-29-2007, 03:53 PM   #7
alexrule123
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2001 XJ Cherokee 
 
Join Date: Dec 2005
Location: Jacksonville, Florida
Posts: 7,319
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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