Gas Carbureted
Gas Fuel Injected
Diesel
Performance Engines
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 The
new high-tech 496 MAG HO (high-output version) represents the
next generation of powerful, smart, virtually maintenance-free
engines. The PCM 555 microprocessor is built right in, so you
can take advantage of everything SmartCraft™ has to offer
in the way of increased performance and convenience. And by
incorporating Horizon™ engine technology, it offers a 3-year
extended maintenance interval (except for periodic fluid-level
checks and seasonal oil and filter changes).
Big-Block V-8 - 496 MAG HO
496 MAG HO Specifications
- Propshaft Horsepower: 425(318 kW)
- Displacement (Liter/CID): 8.1/496
- Cylinders: V-8
- Bore & Stroke (in/mm): 4.25 x 4.38/108 x 111
- Compression Ratio: 9.1:1
- Fuel System: MPI
- Full Throttle RPM Range: 4600-5000
- Ignition Type: PCM 555 Distributorless
- Alternator: 70 amp
- Length (in/cm): 35/89
- Width (in/cm): 33/84
- Height (in/cm): 24/61
- Weight (lbs/kg) - Alpha: N/A
- Weight (lbs/kg) - Bravo One: 1199/544
- Weight (lbs/kg) - Bravo Two: 1214/551
- Weight (lbs/kg) - Bravo Three: 1224/555
Transmission Ratios
- Gear Ratio - Alpha Drive (primary/optional/high altitude):
N/A
- Gear Ratio - Bravo One (primary/optional/high altitude):
1.5/1.36/1.65
- Gear Ratio - Bravo Two (primary/optional/high altitude):
1.81/2.0/2.2
- Gear Ratio - Bravo Three (primary/optional/high altude):
1.81/2.0/2.2
Standard Features
- Audio warning system
- Closed-cooling
- Stainless steel exhaust elbows
- Ceramic, EDP-coated and painted exhaust manifolds
- High-temperature spark plug wires
- Knock-control sensor
- MerCathode®
- Platinum-tipped spark plugs
- Power steering
- Quick-drain oil system
- Remote oil filter
- Serpentine belt
- 75 mm throttle body
- Water-cooled fuel system
- Single-point actuated water drain system
- Water/fuel separator
Optional Features
Boating Benefits
- Mercury-exclusive PCM 555 high-speed microprocessor that optimizes
fuel mixture, knock control and ignition timing independently
for each cylinder, resulting in improved, precise performance.
PCM 555 also enables the connection of SmartCraft components.
- Distributorless ignition system that improves timing accuracy
and eliminates mechanical timing adjustments.
- Closed cooling with 5-year coolant.
- Redesigned exhaust system with aluminum manifolds and stainless
steel elbows that is 65 percent lighter and more corrosion-resistant.
- Dry-joint technology that reduces the potential for water
leakage in exhaust components and improves corrosion resistance
in the exhaust system.
- Innovative new single-point air-actuated raw water drain
system, which enables boaters to extend their boating season
into the cold months.
- Bronze seawater pump for longer life and more durability.
- Billet steel special profile camshaft with roller followers
provide quiet operation and increased performance.
- Platinum-tipped spark plugs to ensure long life and trouble-free
starts.
- Forged-steel connecting rods improve strength and durability.
- Cast-aluminum oil pan which solidifies the engine block for
increased rigidity.
- Exclusive quick oil drain system that eliminates the need
for a pump, simplifying routine maintenance.
- Engine Guardian™ that not only detects and alerts boater
of an engine problem, it processes the data and reduces power
to a maximum, safe level that allows the boater to continue
operation.
- Exclusive drive lube monitor conveniently located atop the
engine for easy access.
- Exclusive Mercury MerCruiser® service dealer network.
 
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