Post by HighProtein on Apr 26, 2005 20:56:46 GMT -5
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-'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
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.
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-'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
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.