Jeep 4L engine specs
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
CAM SPECS
4.0L I6 '87-'95:
Duration advertised: 270*/270*
Duration @ 0.050" lift I/E: 197*/197*
Valve lift I/E: 0.424"/0.424"
Valve overlap: 46*
LSA: 112*, ICA: 110.5*, ECA: 113.5*
IVO: 12*ATDC (0.050" lift)
IVC: 29*ABDC
EVO: 32*BBDC
EVC: 15*BTDC
4.0L I6 '96-'05:
Duration advertised: 256*/260*
Duration @ 0.050" lift I/E: 188*/192*
Valve lift I/E: 0.408"/0.414"
Valve overlap: 43*
LSA: 107.5*, ICA: 100*, ECA: 115*
IVO: 6*ATDC (0.050" lift)
IVC: 14*ABDC
EVO: 30*BBDC
EVC: 18*BTDC
Connecting rod length 6.125"
deck height
9.453"
compression distance 1.601"
deck clearance 0.022"
combustion chamber 56.7cc
head gasket 10.5cc 0.051 thick
dish volume 13.1cc
1.91" 1.50" intake /exhaust valves
factory exhaust 2.25"
throttle body bores
stock 4.0 HO throttle body has a bore of 60mm that tapers down to 56mm below the throttle butterfly flows 455cfm @ 1.5inHg
stock 4.0 engine.
'87-'90 Renix 4.0 owners need not feel left out. The stock Renix throttle body has a bore of 51mm (2.0") and flows ~335cfm @ 1.5inHg
air box flow rate
The stock airbox and air filter (flows 370cfm @ 1.5inHg)
intake volume
91-98 2600ml
99-06 4200ml
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