whats the differance?

90 there is no 4.0L HO the HOs are all 91 and later but only the 91-96 had the HO badge.
 
Dylan W. said:
ok then...whats the difference in a 91 badged H.O. and my 97 4.0 without H.O. badge.?
What makes them H.O.?
Click to expand...
They sleep around at night.....:fuck-you:
 
Dylan W. said:
What makes them H.O.?
Click to expand...

190 horsepower, 210 (?) foot pounds of torque and the skinny pedal.

On a serious note. Everything I could find said all 91-2001 4.0's are H.O. but it could be wrong. My 99 XJ Sport has the H.O.
 
yeah, mine dont say H.O. but someone told me it was, being a 97. It's the Sport model too.

Wheres the difference..in the head?(on the motor)
 
"4.0 Engine Power Ratings
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
The '87-'90 engines had Renix electronic multipoint fuel injection, electronic ignition, a single 51mm (2.0") throttle body, and a rather inefficient low port cylinder head.
In 1991 engines received Chrysler sequential MPFI, a larger 60mm throttle body, revised intake and exhaust manifolds, and a more efficient high port cylinder head. As a result, these engines produced 13hp more than their predecessors and gained the "High Output" designation.
In 1996 engines received noise, vibration, and harshness fixes. The blocks were stiffened with extra ribbing, a main bearing brace was added, and lighter cast aluminium pistons were introduced to reduce cold start piston slap. Engines also received revised camshaft timing for more low rev torque.
In 2000 a distributorless coil-on-plug ignition system was installed, intake and exhaust manifolds were revised, and a more efficient water pump was included. "
from here http://www.jeep4.0performance.4mg.com/
 
So basically they realized that after 5 years of it being "high-output", it had become the norm, so they dropped the adjective.
 
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