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Adaptive Speed Control: Adaptive Speed Control maintains a desired rpm regardless of changes in load or conditions without adjustments to the throttle lever position -- a first for the outboard industry.
Performance-Tuned Exhaust: Exhaust tone has been fine-tuned to provide a brawny performance-inspired sound quality that's unmistakable on the water yet quieter than competing high-output engines.
Transient Spark Technology: Transient Spark Technology electronically adjusts the ignition timing of the engine as needed. This subtle, automatic change produces additional torque for faster hole shot and acceleration.
Extra Charging Power: A powerful alternator provides net charging output of 20 amps at idle and 85 amps at wide open throttle. Idle Charge battery-management technology automatically increases idle rpm to boost alternator output and recharge low batteries.
Unmatched Power and Speed: The Pro XS outboards perform like no other, with a dual overhead cam design that delivers instantaneous throttle response and immediate power.
Superior Fuel Economy: Advanced Range Optimization improves cruise-speed fuel efficiency by automatically adjusting fuel delivery so seamlessly the operator won't feel or hear it.
Lightweight Heavyweight: Pro XS outboards offer a combination of ample torque and less weight -- ideal for heavier loaded boats.
Pro XS Advantages
Ultimate Performance: No outboard gets from zero to wide-open quicker than a Mercury Pro XS with 4.6L V8 muscle. This is performance that will rocket your rig out of the hole and to the next hot spot in an instant.
Tournament-Winning Torque: More displacement delivers more torque and Transient Spark technology optimizes spark timing to boost that torque during hole shot.
Squeezing Speed from Fuel: Mercury V8 and V6 Pro XS models transform every drop of fuel into performance to deliver excellent economy at cruising speed and wide-open throttle.
Smart Charging: A powerful alternator provides net charging output of 20 amps at idle and 85 amps at wide open throttle. Idle Charge battery-management technology automatically increases idle rpm to boost alternator output and recharge low batteries.
Engine type: V8
Displacement: 279 CID (4.6 L)
Cylinder Configuration: V-8 (64 degree) with Dual Overhead Cam (DOHC) and 32-valves
Full throttle RPM: 5600-6200
Alternator: 85-amp (1071 W) with Idle Charge
Starting: Electric Start with SmartStart Protection
Steering: Standard: Hydraulic; Optional: Big Tiller; Optional: Power
Shaft length: 20" (508 mm)
Gearcase ratio: 1.75:1
Dry weight: 505 lbs (229 kg)
Trim system: Power trim and tilt
Engine Type V-8 (64 degree) with Dual Overhead Cam (DOHC) and 32-valves
Displacement 279 cu. in. (4.6 L)
Starting Electric Start with SmartStart Protection
Shaft Length 20 in. (508 mm)
Weight 505 lb. (229 kg)
Trim Method Power trim and tilt
Propshaft Horsepower 250 HP
Full Throttle Operating Range 5600-6200 RPM
Gear Ratio / Shift 1.75:1
Alternator 85 Amp (1071 W) with Idle Charge
Standard: Hydraulic; Optional: Big Tiller; Optional: Power
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