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8.1L Horizon
370 Crankshaft Horsepower
The ideal big-block repower for your inboard yacht. This is the ideal replacement inboard engine for any make of 7.4, 454, 8.2, 502 or 8.1 engines that power twin-engine inboard boats.
3-Year Factory Warranty
Available when purchased through any Mercury/MerCruiser authorized dealer
Engine only – transmissions must be purchased separately.
Resources
- 8.1L Horizon Inline Installation Drawing
- 8.1L Horizon V-Drive Installation Drawing
- 8.1L Horizon Product Data Sheet
- Repowering Sterndrives & Inboard Engines with 2011 EPA Exhaust Emission Regulations
Specifications
| Part Number | V-Drive 8M0052317 Inline 8M0052318 |
|---|---|
| Horsepower @ flywheel | 370 |
| Kilowatts @ flywheel | 272 |
| Maximum RPM (WOT) | 4200-4600 |
| Engine Type | GM V-8 remanufactured iron marine block |
| Bore & Stroke (in/mm) | 4.28 x 3.48 in 109 x 111 mm |
| Compression Ratio | 9.1:1 |
| Fuel / Ethanol Tolerance | 87 octane / up to 10% ethanol |
| Engine Control System | PCM 555 w/knock control & crankshaft trigger |
| Fuel Delivery System | GEN III cool fuel |
| Fuel Injection System / Carburetor Type | Sequential multi-point electronic fuel injection (MPI) |
| Induction System | Two-piece long runner intake with 75mm throttle body |
| Charging alternator amp | 65 |
| Charging alternator watt | 917 |
| Water drain system | Single-point air drain |
| Exhaust System | Electro-deposition paint coated warm iron manifold with 316 stainless dry joint elbow and 2” risers standard |
| Cooling System | 160F closed cooling |
| Accessory Drive System | Serpentine belt |
| Lubrication System | High flow 60 psi oil pump with copper oil cooler |
| Recommended Oil | Mercury MerCruiser Synthetic Blend 25W-40, NMMA FC-W rated |
| Pistons | Cast hypereutectic alloy |
| Cranktrain | Powder metal rods and nodular iron crankshaft |
| Rocker Arms | 1.7:1 stamped steel |
| Length (in/mm) | 32in / 814mm when installed with transmission |
| Width (in/mm) | 33in / 854mm |
| Height (in/mm) | 24in / 607mm |
| Weight (lbs/kg) | 1130lbs / 513kg when installed with transmission |
| Features & Related Products | Analog Controls Analog Gauges Digital Gauges Remote Oil filter SmartCraft Digital Technology |
| Compatible Drives (Application Dependant - Contact Sales or Service) | ZF 80A ZF 63A SF 63IV VD 5000A VD 5000V VD 72C – requires spring plate ZF 63C – requires spring plate |
