850 SCi

Forged-steel, 100% machined connecting rods and custom Mercury Racing aluminum pistons
Eight ignition coils, one per cylinder, eliminates spark plug fouling
An all-new, high velocity cooling system uses a combination of a circulating pump and sea pump to keep the engine at an optimal operating temperature and peak performance.
557-cubic inch tall deck cast iron cylinder block featuring five main bearings with stud fastened steel main bearing caps.

Superchargers feature engine supplied lubrication for added protection and enhanced durability
Eight ignition coils, one per cylinder, eliminates spark plug fouling
The Mercury PCM microprocessor optimizes fuel, spark timing and knock control for each cylinder independently, enhancing engine running quality, performance and durability

New high performance air filters/flame arrestors, custom designed for Mercury Racing by ITG, enhance engine operating efficiency and increased durability resulting in lower maintenance.
Knock control, managed electronically by the PCM microprocessor, enables the engine to run on 87-octane fuel at a reduced power output in situations where the recommended 89-octane is not available.
89 posted pump octane (R + M)/2, or (95 RON) International fuel calibration for performance boaters who desire big block power but have limited access to 91-posted pump octane fuel.
Engine's 800 rpm idle speed makes shifting into and out of gear as smooth as silk, making docking much easier.

Twin-screw Lysholm superchargers require less power than traditional single-screw roots blowers.
The Mercury PCM microprocessor continuously monitors the amount of boost needed to provide consistent 850 horsepower in any condition or environment and varies boost accordingly.
Innovative dry-sump engine lubrication reduces friction and adds horsepower for improved overall boat performance.