S
ECTION
2: L
IMITATIONS
C
IRRUS
D
ESIGN
P
OWERPLANT
L
IMITATIONS
SR20
2-6
P/N 11934-005
Powerplant Limitations
Engine
Lycoming Engines......................................................................... IO-390-C3B6
Power Rating .................................................................... 215 HP @ 2700 RPM
Maximum RPM ..................................................................................2700 RPM
• N
OTE
•
Due to the mechanical design of the propeller governor, it is
normal for the engine to temporarily exceed 2700 RPM during
some phases of flight. If necessary, a slight reduction in throttle
setting will decrease the RPM to keep the engine operating at or
below 2700 RPM.
Oil Temperature...................................................... 235 °F (113 °C) maximum
Minimum Oil Temperature for Takeoff................................... 100 °F (38 °C)
Oil Pressure:
Minimum (Idling) ......................................................................................25 psi
Normal Operating Range................................................................... 55 - 95 psi
Maximum (Starting, Warm up, Taxi, & Takeoff) ................................115 psi
Approved Oils:
Engine Break-In: For first 50 hours of operation or until oil consumption
stabilizes, use straight mineral oil conforming to SAE J1966 or
MIL-L-6082B SAE grades. If engine oil must be added to the
factory-installed oil, add only SAE J1966 or MIL-L-6082B straight mineral
oil.
After Engine Break-In: Use only oils conforming to SAE J1899 or
MIL-L-22851 Ashless Dispersant SAE grades.
Recommended Oil Grades
a
Ambient Air
Temperature (SL)
Engine Break-In
After Engine Break-In
Single
Viscosity
Multi-
Viscosity
Single
Viscosity
Multi-
Viscosity
All Temperatures
-
-
-
SAE 15W-50
SAE 20W-50
Above 80 °F (27 °C)
SAE 60
-
SAE 60
-
Above 60 °F (16 °C)
SAE 50
-
SAE 40
SAE 50
-
Reissue A