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2008 Aprilia RXV 450-550

2008 Aprilia RXV 450-550


Victory in competition is the evolutionary force driving the changes to the model year 2008 Aprilia RXV 4.5/5.5.  Experience in last year’s Enduro World Championship, in which Aprilia Racing did so well, plus valuable input from team ace and four times world champion Stefan Merriman, has guided Aprilia’s designers and engineers in transferring developments first made in the field directly into series production. Everybody involved with the RXV has worked hard and in close co-operation to introduce a number of major improvements compared to last year’s motorcycle, making this year’s model even more “race ready”, and better able to deliver complete satisfaction to demanding amateur and professional riders.

DESIGN: DETAILS COUNT

As with all Aprilias, a tremendous amount of care and attention has been lavished on even the smallest details on the RXV.
As a result the RXV boasts a unique, unmistakable styling that is nevertheless fully functional in achieving the sort of unrivalled performance that a genuine competition motorcycle demands.
Essential, decisive lines convey a sensation of lightness and build quality. The RXV’s designers have been eager to incorporate the features that distinguish all Aprilias, and have launched a whole new style for off-road motorcycles. The amazing technology around which this motorcycle is built grabs your attention instantly. One glance at the V twin engine, mixed steel trellis and aluminium alloy frame or mighty swingarm is all you need to be convinced. The tail and rear side panels are highly innovative too, and are totally different in styling from traditional off-road designs. The tail covers a central exhaust system with twinned tail pipes under the rear mudguard. Whichever way you look at it, the RXV presents a host of stunning technical solutions, all enhanced by original 2008 racing colours to express the aggressive nature of this born-to-race mean machine. 

As you would expect from Aprilia, the latest RXV is packed with intelligent design solutions. Fixed air ducts, for example, allow the fuel tank to tilt up for easy access to the air filter box.  
Everything about the RXV is dedicated to winning races. The quest for technical perfection has led the design team to tweak even small details on the basis of input from the many time champions who have raced the RXV.
Among the many changes introduced on the 2008 RXV, the most obvious are the new fuel tank that blends in sensuously with the lines of the bike and allows the rider to move around more easily, and the new Magura handlebars with more practical, race-oriented controls.

ENGINE: CONTINUOUS EVOLUTION

The amazing 45.2 engine is, of course, the centre piece of RXV technology. Aprilia was the first manufacturer in the world to believe in the validity of the V twin for enduros, 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 this exceptional engine, which is produced entirely 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 RXV an unbeatable mix of power and handling.
The 77° V angle is the result of extensive 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 ridability and an extended power band for off-road riding.

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. Starting with the 2008 model, the ECU will be able to switch between two different mappings at the touch of a switch on the handlebars. This extremely useful innovation offers 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 off-road 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.

Just as much effort has been put into weight reduction, 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.

The choke is new too, and features a knob on the filter box instead of a handlebar control. Even the air filter has been improved and is now made from a sponge material derived from that used on Aprilia’s official racing machines.
The 2008 RXV even offers a choice of silencer. The bike leaves the dealer fitted with the well established and stylish under-seat cans. For use in the field, however, the RXV can be fitted with a brand new laterally mounted steel silencer from Arrow, developed directly from experience gained in racing.

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 12,000 rpm (450 cc version)

CHASSIS: LIGHTER THAN EVER

An uncompromising machine like the RXV demands a great chassis.

The perimeter frame has been developed in conjunction with the engine, with the result that the 2008 RXV has lost 4 kg in weight. The tubular steel trellis structure is interference fitted to forged 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. 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 2008 to improve stability and control over rough surfaces. The 45 mm upside down fork also boasts new settings for greater high speed stability and improved damping over stony ground, but can still be adjusted to suit the needs of more expert users.

BRAKING SYSTEM

The advanced technology and high performance of the RXV chassis are reflected in a superb braking system. The RXV features Nissin calipers and lightweight wave discs (270 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 RXV are of the very best quality available.
Among the many prestige components are:

  • Digital instruments: ultra-lightweight, compact and designed to provide all the information a rider could possibly need.
  • New Magura tapered aluminium handlebars with no cross member for optimal elasticity and control
  • High luminosity LED tail light
  • Aluminium oil filter cover
  • New engine start push-button (instead of the old ignition key block)
  • New racing electrical system
  • New sponge material racing air filter

RXV 2008 Merriman Replica

Precious feedback from Stefan Merriman and Aprilia Racing’s vast racing experience accumulated on circuits all over the world have gone into the creation of a unique special edition of the RXV 2008. The RXV Merriman Replica is the ultimate expression of Aprilia technology and is destined to make its mark in the next assault on the Word Championship that Aprilia will be launching, together with Stefan Merriman, in 2008.

The Merriman Replica differs from the standard 2008 RXV in a number of ways. The very best technical solutions have been identified to give even better performance to a motorcycle that is already at the top of its class, and to fully exploit the massive potential of an engine that has revolutionised our understanding of enduro racing. The Merriman Replica’s 77° 45.2 engine benefits from the same revolutionary new electronic control unit as the standard model, with two pre-programmed mappings that can even be switched during the course of a race. But compared to the standard 2008 RXV, the Merriman Replica’s engine is equipped with a new, heavier flywheel, advanced titanium lateral exhaust  developed in conjunction with Arrow (and already used for racing this year), and an innovative slipper clutch designed to make the RXV easier to control and more precise on entry into bends.
                        
Improvements have been made to the chassis too. The frame differs from the standard version for a brand new steel trellis with special 1.2 mm thick tubes. The fork is more robust, with 50 mm stanchions, and at the rear the monoshock has been recalibrated to improve the action of the lightened aluminium swingarm. The steering yokes are new too, and are made from single billets for greater rigidity and precision under at-the-limit riding conditions.

The Merriman Replica is fitted with new Alpina wheels with hubs machined from single billets and removable spindles. New Magura tapered handlebars have been added too. Changes have also been made to the riding position: the new seat has a step at the rear and the tank has been redesigned in the same way as that of the standard RXV to give the rider greater freedom of movement in all stages of racing.

From the styling point of view, in addition to its more advanced technology, the 2008 RXV Merriman Replica also boasts an aggressive looking sump guard in composite material, graphics embellished with the transfers of Aprilia’s official suppliers for 2008, and number holders with a red background.

Aprilia RXV                             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 (12:1).

Fuel system

Integrated electronic engine management system controlling ignition and fuel injection.
Throttle body: 38 mm (40 mm).
“Hard/soft” mappings selectable from the handlebars.

Ignition

Electronic.

Starting

Electric starting.

Alternator

340 W.

Lubrication

Dry sump with external oil tank. Separate gearbox lubrication.

Gearbox

5 speed. Enduro gear ratios:
1st 12/31
2nd 13/25 
3rd 15/23
4th 19/24
5th 21/22

Clutch

Cable operated multi-plate wet clutch.

Primary drive

Spur gears.
Transmission ratio: 22/56.

Final drive

Chain.
Transmission ratio: 15/48.

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 270 mm stainless steel disc with floating caliper.

 

Rear: Æ 240 mm stainless steel disc with floating caliper.

Wheels

Light alloy.
Front: 1.60 x 21”
Rear: 2.15 x 18”

Tyres

Front: 90/90 x 21”
Rear: 140/80 x 18”

Dimensions

Overall length: 2,222 mm
Overall width: 800 mm
Ground clearance: 396 mm
Seat height: 946 mm
Wheelbase: 1,495 mm

Fuel tank

Capacity 7.8 litres

Exhaust

Euro 3 under-seat exhaust with catalytic converter.
Arrow exhaust for racing use only.

 

Aprilia RXV Stefan Merriman Replica   -    Technical Specifications

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

Total displacement  

449 cc

Compression ratio

12.5:1

Fuel system

Integrated electronic engine management system controlling ignition and fuel injection.
Throttle body: 38 mm
“Hard/soft” mappings selectable from the handlebars.

Ignition

Electronic.

Starting

Electric starting.

Alternator

340 W.

Lubrication

Dry sump with external oil tank. Separate gearbox lubrication.

Gearbox

5 speed. Enduro gear ratios:
1st 12/31
2nd 13/25 
3rd 15/23
4th 19/24
5th 21/22

Clutch

Cable operated multi-plate wet clutch. APTC slipper device.

Primary drive

Spur gears.
Transmission ratio: 22/56.

Final drive

Chain.
Transmission ratio: 14/50

Exhaust system

Arrow Racing all-titanium laterally mounted exhaust.

Frame

Perimeter frame in special aeronautical steel with aluminium alloy vertical members.

Front suspension

Ø 50 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 270 mm stainless steel disc with floating caliper.

Rear: Ø 240 mm stainless steel disc with floating caliper.

Wheels

Alpina Off-Road light alloy wheels in red and black.
Front: 1.60 x 21”
Rear: 2.15 x 18”

Tyres

Front: 90/90 x 21”
Rear: 140/80 x 18”

Dimensions

Overall length: 2,222 mm
Overall width: 800 mm
Ground clearance: 396 mm
Seat height: 946 mm
Wheelbase: 1,495 mm

Fuel tank

Capacity 7.8 litres

 

 

 

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