Mercury 8.1 S Horizon

37
CH52
Engine Specifications
Model 350 Mag MPI Horizon 8.1 S Horizon
Propshaft Horsepower 300
1
370
1
Propshaft Kilowatts 224
1
276
1
Displacement 350 cid (5.7l) 496 cid (8.1l)
Maximum RPM @ WOT
2
4400-4800 rpm 4200-4600 rpm
Idle RPM in NEUTRAL
4
600 rpm 650 rpm
Oil Pressure @ 2000 RPM 30-70 psi (207-483 kPa) 60 psi (414 kPa)
Oil Pressure @ Idle Minimum 4 psi (28 kPa) 30 psi (207 kPa)
Thermostat 160° F (71° C)
Timing @ Idle RPM
3
8° NA
Firing Order 1-8-4-3-6-5-7-2 1-8-7-2-6-5-4-3
Electrical System 12-Volt Negative (–) Ground
Alternator Rating - Hot Operating
Amps
65 Amps
Alternator Rating - Cold Operating
Amps
72 Amps
Recommended Battery Rating Min 550 cca / 700 mca / 120 Ah Min. 650 cca / 825 mca / 180 Ah
1
Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating procedures.
2
Measured using an accurate service tachometer, with engine at normal operating temperature.
3
A special procedure must be followed to check or adjust timing. Consult your Authorized Mercury MerCruiser Dealer before attempting
this procedure.
4
Idle speed on EFI models is not adjustable.