Mercury 8.1S Horizon, Product Applications Manual

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Important Information
90-863758060 AUGUST 2006 Page 1A-11
INBOARD MODELS BELOW 239 KW (320 HP)
5.7L 350 MAG MPI 350 MAG MPI Horizon
Propshaft Power 194 kw (260 hp) 224 kw (300 hp) 224 kw (300 hp)
Displacement 5.7 liter (350 cid)
Configuration / Cylinders V‑8
Bore x Stroke 102 x 88.4 mm (4.00 x 3.48 in.)
Compression Ratio 9.4:1
Fuel System 2 Bbl. Carb. MPI
Ignition System Thunderbolt 5 Digital Digital
Alternator Amp. (Cold/Hot) 72 amp / 65 amp
Maximum RPM at WOT 4200–4600 4600–5000
Rev Limiter RPM 4750 5150
Idle RPM 650 600
Oil Pressure @ 2000 RPM 30‑70 psi / 207‑483 kPa
Min. Oil Pressure @ Idle 4 psi / 28 kPa
Thermostat Temperature 71°C (160°F) (Seawater Cooled)
Thermostat Temperature 77°C (170°F) (Closed Cooled)
Timing 10° BTDC 8° BTDC
Firing Order 1‑8‑4‑3‑6‑5‑7‑2
Transmission Offerings Refer to SECTION 2‑Transmission and Drive Line
Weight 400 kg (888 lb.) 390 kg (860 lb.) 427 kg (948 lb.)
Remote Oil Not Available Standard
Closed Cooling Kit Optional Standard
Audio Warning System Standard
Water Drain System Multipoint Drain System
Multipoint Drain System
standard
Air Actuated Water
Drain is optional for
Closed Cooling models
Air Actuated Water
Drain
50 Amp Circuit Breaker Standard
Flush System Kit Standard
Exhaust Elbows Cast Iron w/Ceramic, EDP and Paint
Optional Riser Kits 43 mm (1.7 in.) 76 mm (3 in.), 152 mm (6 in)
Battery rating 375 cca / 475 mca / 90 Ah 750 cca / 950 mca / 180 Ah (Minimum rating)
Battery rating for DTS models N/A 800 cca / 1000 mca / 190 Ah (Minimum rating)