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2009 Aprilia SXV

2009 Aprilia SXV

Aprilia keeps faith with its policy of transferring racing developments immediately into production. The 2009 model of the SXV, the world’s first twin cylinder supermotard, confirms Aprilia’s traditions in developing and perfecting its production motorcycles on the basis of the latest technical know-how acquired by Aprilia Racing.

Design

The design of the latest SXV is the result of Aprilia’s usual manic attention to detail. Its unique lines make it quite unmistakable but totally functional and effective at the same time. Because first and foremost the standard Aprilia SXV is a genuine competition motorcycle.

You have to admire the distinctive and instantly recognisable technology of the SXV. One glance at the V2 engine, mixed trellis and aluminium frame, mighty swingarm and central exhaust system with twinned silencers under the rear mudguard, and you cannot escape its magical attraction.

Whichever way you look at it, the SXV is packed with stunning details highlighted by new racing colours that express the natural aggression of this born-to-race motorcycle. The latest SXV is packed with intelligent design solutions. Fixed air ducts, for example, allow the fuel tank to tilt up for easy access to the airbox.
And the quest for technical perfection has led the design team to tweak even small details on the basis of input from the champions who have raced the SXV.

Engine: Continuous Evolution

The amazing 45.2 engine is the centre piece of SXV technology. Aprilia was the first manufacturer in the world to believe in the validity of the V twin for supermotards, a segment in which all other marques still cling rigidly to single cylinder engines. Aprilia’s high-tech V twin design has already proved 100% reliable in competition.
Even homologation for road use has not compromised the technology and performance of an engine that is produced in-house by Aprilia. Since the earliest stages of the design process, the 45.2 has evolved to keep pace with chassis development and to give the SXV unbeatable performance.

The 77° V angle is the result of testing aimed not only at boosting power but also at reducing vibration. As a result Aprilia’s engineers have been able to eliminate engine balancer shafts. Despite this the 45.2 engine still vibrates far less than any single cylinder alternative.

The cylinders themselves are integrated in the crankcase and have replaceable wet liners. This unique layout has allowed the engine ancillaries to be arranged in a way that achieves extremely compact dimensions.
The results are amazing: the Aprilia V twin is one of the most compact V twins in the world, and smaller in size than many singles of similar displacement. All design choices have been taken in order to obtain maximum power plus an extended useful power band.

The sophisticated electronic engine management system, developed by Aprilia Racing, incorporates numerous innovations for the off-road sector.

The injection system features 38 mm throttle bodies (40 mm on the 550) and is managed by a programmable control unit. The ECU is able to switch between two different mappings at the touch of a switch on the handlebars: a full power mapping for use in conditions of good grip, and a second, softer mapping for smoother power delivery under difficult conditions. The system provides an extremely valid aid to control and has been welcomed both by expert riders (the system was actually tested in the final phases of the world championship) and by supermotard fans in general. All you need is one quick click to select exactly the right power for the circumstances.

Reduced unitary displacement has allowed Aprilia to develop an extremely compact and lightweight crankshaft. The engine is more responsive to variations in throttle opening as a result, and the bike as a whole is faster and more manoeuvrable thanks to the reduced gyroscopic effect from the crankshaft.

The single overhead cam configuration with four titanium valves per cylinder head represents an ideal compromise between compact size, light weight and high performance.

Thanks to its advanced technology, the 45.2 is also an extremely silent running and ecological engine. Technology, after all, should mean reliability and longevity as well as high performance. The 45.2 engine touches new heights in this direction, and permits extremely easy access to parts requiring regular maintenance like the spark plugs, oil filter and air filter.

The design objective in terms of weight reduction was ambitious indeed, and the 45.2 engine sets a new record for a V twin with an electric starter.

Abundant use has been made of prestige lightweight materials. The central crankcase sections are in aluminium-silicon alloy; external engine casings are in magnesium; the valves are in titanium; and all gears are exceptionally light in weight.

A closer look at the unique characteristics of the 45.2 engine:

  • electronic fuel injection with 38 mm throttle bodies (40 mm on the 550 engine);
  • dry sump lubrication with separate external reservoirs for gearbox and engine oil to avoid contaminating engine oil with particles of clutch friction lining, and for extended lubricant life;
  • single overhead cam with four valve heads;
  • single piece crankshaft;
  • cylinders integrated in the crankcase with wet liners;
  • maximum engine speed 12,500 rpm (450 motard).

Chassis: Lighter Than Ever

An uncompromising engine demands an uncompromising chassis. The perimeter frame is a tubular steel trellis structure interference fitted to pressed aluminium side members to form an extremely rigid whole. The engine itself forms an integral part of the chassis, acting as a load bearing element and contributing to overall rigidity.

The variable section aluminium alloy swingarm is a brilliant example of industrial design. More than just an eye-catching design solution, this revolutionary swingarm offers the highest structural rigidity available in this class of motorcycle. The rising rate suspension linkage is damped by a fully adjustable Sachs monoshock with piggy back cylinder and two different hydraulic settings for high and low speeds. The calibration of the rear suspension has been modified for 2009 to improve stability and control over rough surfaces

Braking System

The advanced technology and high performance of the SXV chassis are reflected in a superb braking system. The SXV features FTE calipers and lightweight wave discs (320 mm at the front) for maximum braking control even under the most challenging conditions.
The 240 mm rear disc is braked by a single piston caliper for a perfect combination of power and control.

Components: Ready To Race

All parts of the Aprilia SXV are of the very best quality available:

  • digital instruments: ultra-lightweight, compact and designed to provide all the information a rider could possibly need;
  • magura tapered aluminium handlebars with no cross member for optimal elasticity and control;
  • High luminosity LED tail light;
  • aluminium oil filter cover

Aprilia SXV Technical Specifications (specifications for the 550 engine appear in brackets)

  • Engine - 77° V twin four stroke. Liquid cooled. Single overhead cam with rocker operated exhaust valves, chain timing drive. 4 valve heads with titanium valves.
  • Fuel - Lead-free petrol.
  • Bore x stroke - 76 x 49.5 mm (80 x 55 mm).
  • Total displacement - 449 cc (549 cc).
  • Compression ratio - 12.5:1 (12 x 1).
    Fuel system - Integrated electronic engine management system controlling ignition and fuel injection.
    “Hard/soft” mappings selectable from the handlebars.
  • Throttle body: 38 mm (40 mm).
  • Ignition - Electronic.
  • Starting - Electric starting.
  • Alternator - 340 W.
  • Lubrication - Dry sump with external oil tank. Separate gearbox lubrication.
  • Gearbox - 5 speed. Supermotard gear ratios: 1st 13/30, 2nd 15/27, 3rd 16/23, 4th 20/23, 5th 21/21
  • Clutch - Cable operated multi-plate wet clutch.
  • Primary drive - Spur gears.
  • Transmission ratio: 22/56.
  • Final drive - Chain.
  • Transmission ratio: 15/46 (16/46).
  • Frame - Steel perimeter frame with aluminium alloy vertical members.
  • Front suspension - Ø 48 mm upside down fork with two adjustments.
  • Rear suspension - Box section aluminium swingarm with cast body. Hydraulic monoshock with compression and rebound adjustment.
  • Brakes - Front: Ø 320 mm stainless steel disc with radial caliper. Rear: 240 mm stainless steel disc with floating caliper.
  • Wheels - Light alloy. Front: 3.50 x 17”. Rear: 5.50 x 17”
  • Tyres - Front: 120/70 x 17”. Rear: 180/55 x 17”

Dimensions

  • Overall length: 2,222 mm
  • Overall width: 800 mm
  • Ground clearance: 318 mm
  • Seat height: 918 mm
  • Wheelbase: 1,495 mm
  • Fuel tank Capacity: 7.8 litres