Here you will find information on the Mirage "big-block," the 4G93. Mitsubishi's 4G93, is a SOHC (single overhead camshaft) inline four cylinder displacing 1834cc. This engine has been used in many Mitsubishi designed vehicles over the years, including the Mirage (4th and 5th generation). Though built for economy, the 4G93 has decent performance potential, and makes good torque for an engine of it's size even in stock trim. Some people have pushed this engine to the max, generating well over 300hp upon turbocharging (as it's a naturally aspirated engine), or even running in the rhelm of 180+hp in N/A form.
4G93 SOHC 16V Engine Info
Bore x Stroke in Millimeters
81x89 (1834cc Displacement)
Compression Ratio
9.5:1 (USA)
10.0:1 (Japan)
Camshaft Specs
Duration (Actual)
Intake – 244°
Exhaust – 248°
IVO – 14° BTDC
IVC – 50° ABDC
EVO – 58° BBDC
EVC – 10° ATDC
Lift in Millimeters
Intake – 9.144 (.360”)
Exhaust – 9.144 (.360”)
Intake Valve:
30mm Head Diameter
5.959mm Stem Diameter
110.236mm Overall Length (OAL)
Exhaust Valve:
27mm Head Diameter
5.954mm Stem Diameter
113.843mm Overall Length (OAL)
Combustion Chamber Volume
49cc
Cylinder Head Gasket Installed Height (Thickness)
0.96mm
Deck Height
0mm
Intake CC
?
Other Useful Specs
Intake Manifold Inlet Diameter
50mm (Throttle Body Side)
’02 Mirage is Different (Uses 4G94 Manifold)
Throttle Body Diameter
48mm (At Throttle Plate)
’02 Mirage May Differ
Injector Flow Rate
210cc/min. (Federal & Most Cali.)
240cc/min. (Some Rare Cali.)
Fuel Pressure
Static 43.5 PSI
@ WOT 51 PSI (approx)
