Guy Allen•19 Mar 2008

NEWS

Guzzi rally bike nears launch

Stelvio promises lively performance

Moto Guzzi's rally bike, the Stelvio, is nearing launch, with the factory revealing more pics of the production bike and a little more detail.

The heart of the machine is the four-valve OHC 1151cc 90-degree twin, mated to a six-speed transmission and shaft rear drive.

It's claiming 105 horses at 7500rpm in this form and 10.8kg-m of torque at 6400rpm, which should make it lively though not the most powerful in its class.

Brakes are four-piston radial mounts up front, while the rims are 17-inchers with Pirelli Scorpions as standard.

Suspension is 50mm Marzocchi up front and a Boge unit on the rear.

We're told there is lots of adjustability built in, including levers, handlebar, windscreen and seat height.

Look for a launch date later this year.

Factory info:

DESIGN

Double high-/low-beam headlight assembly with convex surface lenses.

Half-fairing with integrated air deflectors and turn indicators.

Front mudguard with spoiler and integrated fork stems protection.

Manually adjustable windshield.

Blow-moulding process tank with integrated protective superstructure.

Rider saddle adjustable to two positions with skidproof upholstery integrated to the tank.

Passenger saddle with adapted seating and skidproof upholstery.

Glove-box with unlocking control on the handlebar.

Aerodynamic under-sump protection lug.

Engine side bulkheads with metal grid.

Luggage supporting frame integrated, with passenger grab handles unit and luggage carrier.

Tubular footrest supports.

Full black "Quattrovalvole" powertrain.

Aluminium hexagonally cross-sectioned silencer with Moto Guzzi customised double bottom.

ENGINE

"Quattrovalvole", 90° V-twin, 1200

Single overhead camshaft timing system.

Single plate clutch.

New exhaust system with double superimposed helical outlet.

New crankcase with incorporated front bearing support with bushing.

New valves with Ø 5-mm stem.

New 55% rigid crankshaft.

New Asso 3-ring forged pistons.

New conical valve springs.

Head with independent oil cooling circuit.

Oil cooling jets to piston.

New cooling oil pump with pressure-relief valve.

New lubrication oil pump coaxial with the cooling pump.

Three gears for oil pump and timing shaft control.

New type of connecting rod bushings.

Silent Morse type chains for camshaft control.

Hydraulic chain tensioners and tensioning pads.

New Ø 50-mm throttle body.

New IWP 189 Marelli type injectors

Floating head covers to cushion noise.

Transmission with compact reactive cardan shaft drive.

6-gear gearbox.

Euro 3

New high performance exhaust system.

CHASSIS

Double cradle frame of high-resistant steel with 6 points for engine connection.

Upside-down front fork with 50-mm stems, adjustable preloading and hydraulic damping with radially-mounted caliper.

Shock absorber with preloading and rebound adjustment.

Rear suspension with progressive articulation single arm.

Front brakes, radially mounted with 4 opposed pistons and 320-mm discs.

Rear 282-mm disc brake, floating caliper with two parallel pistons.

Tubeless spoke wheels with aluminium Ber rim and Alpina spokes.

Rear tyre: 180/55/17 Pirelli Scorpion.

Front tyre: 110/80/19 Pirelli Scorpion.

ENGINE AND TRANSMISSION:

ENGINE

Type: 90° V-twin engine, 4-stroke

Cooling: through air and oil and an independent cooling pump

Engine capacity: 1,151 cc

Bore and stroke: 95 x 81.2 mm

Compression ratio: 11: 1

Timing system diagram: intake valve opening 36° BTDC

(1-mm checking clearance): intake valve closing 62° ABDC exhaust valve opening 58° BBDC exhaust valve closing 30° ATDC measured with a 1.5 mm rocker arms/valve control clearance

Maximum power : 77 kW (105CV) at 7,500 rpmv

Maximum torque : above 108 Nm at 6,400 rpmv

Fuel supply / Ignition : Multipoint sequential electronic ignition, Magneti Marelli IAW5A phased, alfa-n system; two Ø 50mm throttle bodies, Weber IWP 189 injectors, lambda probe

Start-up : Electric

Spark plugs : NGK PMR8B (Long Life)

Exhaust system : stainless steel, 2-in-1 type, three-way catalytic converter with lambda probe

Type approval : Euro 3

TRANSMISSION

Gearbox : 6 gears

Gear ratio values : 1st 17/38 = 1 : 2.235

2nd 20/34 = 1 : 1.700

3rd 23/31 = 1 : 1.348

4th 26/29 = 1 : 1.115

5th 31/30 = 1 : 0.968

6th 29/25 = 1 : 0.862

Primary transmission : with helical teeth, ratio 26/35 = 1: 1.346

Final drive : Compact reactive cardan shaft drive system called CA.R.C.; double joint and floating bevel gear pair, ratio 12/44 = 1 : 3.666

Clutch : single-disc with integrated anti-vibration buffer

CHASSIS

Chassis : tubular in high-strength steel with integrated engine

Wheelbase : 1,535 mm

Trail : 125 mm

Headstock angle : 27°

Steering angle : 34°

Front suspension : fork with Ø 50mm inverted stems, fully adjustable (spring preload and hydraulic compression and rebound damping) with radially-mounted brake calliper

Front wheel travel : 170 mm

Rear suspension : single arm with rising-rate leverage, single shock absorber with hydraulic rebound damping adjustment and knob spring preloading set screw.

Rear wheel travel : 155 mm

Front brake : double stainless steel floating disc, Ø 320 mm, radial calipers with 4 opposed pistons

Rear brake : fixed stainless steel disc, Ø 282 mm, floating caliper with 2 parallel pistons

Wheels : Tubeless with spokes

Front rim : 2.50" x 19"

Rear rim : 5.50" x 17"

Front tyre : 110/80 R19"

Rear tyre : 180/55 R17"

ELECTRICAL SYSTEM

System voltage : 12 V

Battery : 12 V - 18 Ah

Alternator : 12 V - 550 W