2004 Honda CBR 1000 RR
Back in the saddle again...
By Sean Alexander, Feb. 05, 2004, Photography by Fonzie
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In general, Honda® avoided installing these devices on motorcycles because all existing designs included inherent drawbacks that compromised the benefits. Typically, when a steering damper was set for high-speed performance, the motorcycle’s handling would be adversely affected at moderate and lower speeds--not a good trade-off for general-purpose riding.If a compromise setting was selected to mollify a steering damper’s negative effects on low-speed handling, the high-speed benefits were similarly reduced--again, not much net gain. So when Honda’s engineers decided a maximum-performance machine such as the CBR®1000RR would benefit from the positive aspects of a steering damper, they simply decided to reinvent the device to reap the full rewards while eliminating the historic drawbacks.
"Once again, Honda has harnessed technical sophistication into a seamless package that enhances the pleasure of riding."
Unlike past designs, the new Honda Electronic Steering Damper (HESD) has no fixed damping characteristics. Instead, damping action is controlled by the CBR1000RR’s Electronic Control Unit (ECU), which automatically varies damping force according to vehicle speed and acceleration over a wide range of riding conditions. Jointly developed in cooperation with Kayaba, the HESD mounts atop the steering head and a linkage arm connects the HESD to the triple clamp.
Within the damper unit, a large chamber filled with oil is divided into two sections by a moving vane connected to the linkage arm. In response to steering movements transmitted by the linkage arm, the vane forces oil between the left and right sides of the chamber through various passages, including a main valve controlled by a linear solenoid that receives its control signals from the ECU.
At lower speeds, the damper’s main valve opens fully and therefore creates virtually no perceptible damping effect. Result: a light steering feel. As speed and rate of acceleration increase, the linear solenoid constricts oil flow between the two sides of the chamber, resulting in the desired amount of increased steering damping. Four one-way check valves ensure that oil flows through the main valve in only one direction, whether the vane is moved to the right or the left.
A relief valve maintains internal pressure below a designated set level, while another small piston compensates for temperature-induced changes in oil volume. Technical aspects notwithstanding, CBR1000RR pilots will reap the benefits of the new HESD in the form of confidence-inspiring handling, making the riding experience all the more enjoyable. Once again, Honda has harnessed technical sophistication into a seamless package that enhances the pleasure of riding.
| CBR1000RR ** Information And Specs Provided By Honda ** | ||||||
| Introduction
Honda’s 2004 CBR1000RR ushers in a whole new era of inline-four Superbike performance. Taking its technical cues from the MotoGP-winning RC211V, the CBR1000RR redefines Superbike domination. Unique Features
Honda Electronic Steering Damper™ (HESD™) for optimum steering effort and stability. Cassette-type close-ratio six-speed transmission. Centrally located fuel tank increases mass centralization and allows more compact frame design. Radial-mounted front brakes. New-style center-up exhaust system. Unit Pro-Link® rear suspension and swingarm design inspired by RC211V. New Line Beam Headlight features three-piece reflector design. Dual Stage Fuel Injection System (DSFI) features two injectors per cylinder. All-new aggressive styling. Engine/Drivetrain All-new liquid-cooled DOHC 16-valve 998cc four-stroke inline four-cylinder engine features bore and stroke dimensions of 75mm x 56.5mm. Sixteen-valve cylinder head features 29mm intake and 24mm exhaust valves with an 11.9:1 compression ratio for efficient combustion and high horsepower. Lightweight nutless connecting rods. Direct shim-under-bucket valve actuation system ensures high-rpm durability. New iridium-tip spark plugs improve fuel combustion and performance. Dual Stage Fuel Injection (DSFI) system features two injectors per cylinder--one upper and one lower--controlled by an ECU that senses rpm and throttle opening. Lower injector enhances rideability while upper injector improves top-end horsepower. At lower rpm only the lower injector is working. At higher rpm, both injectors are activated. The system uses 44mm throttle bodies. All-new Denso injectors feature new lightweight valving for faster reaction time and 12 holes per injector for improved atomization of fuel mixture, resulting in optimum combustion efficiency and power. Auto-enriching system is integrated into PGM-FI module, eliminating the need for a manual choke. Forged aluminum pistons with moly surface treatment for reduced friction. Aluminum composite cylinder sleeves are high-pressure-formed from sintered aluminum powder impregnated with ceramic and graphite. The lightweight composite sleeves provide better wear resistance and superior heat dissipation compared to conventional sleeves. Electronic ECU provides two digital 3-D fuel injection maps for each cylinder and two digital 3-D ignition maps for cylinder pairs, creating ideal fuel mixture and spark advance settings for superb rideability. Ram-air system provides a high volume of cool air to the 8.35-liter airbox for linear power delivery and incredible engine performance. Stainless steel four-into-two-into-one center-up exhaust with twin outlets and titanium core increases lean angle and reduces wind drag. Liquid-cooled aluminum oil cooler is lightweight and efficient. Maintenance-free automatic cam-chain tensioner. Starter gears located on the right side to produce narrow engine and increased lean angle. Race-spec radiator with 40 percent greater volume compared to CBR®954RR’s. Eight-plate clutch is compact and tough, featuring durable friction plate material. Cassette-type, close-ratio six-speed transmission is easily accessible for rapid gear ratio changes and maintenance at the race track. Durable #530 O-ring-sealed drive chain. Chassis/Suspension Additional Features |
Full Specifications
Model: CBR1000RR Overall length: 2023mm (79.6 in.) Overall width: 712mm (28.0 in.) Overall height: 1133mm (44.6 in.) Wheelbase: 1415mm (55.7 in.) Seat Height: 820mm (32.3 in.) Ground Clearance: 130mm (5.1 in.) Dry Weight: 179.8kg (396 lb.) Weight dist. (f/r): 92/87kg (203.5/192.5 lb.) Engine Type: 998cc liquid-cooled 4-stroke
Cylinder arrangement: Transverse inline four-cylinder Bore and stroke: 75mm x 56.5mm Compression ratio: 11.9:1 Carburetion: Dual Stage Fuel Injection (DSFI) Throttle body size: 44mm; two injectors per cylinder; 12 holes per injector Valve Train: DOHC; four valves per cylinder Valve timing: Intake: opens 18 degrees BTDC Exhaust: opens 39 degrees BBDC Valve lift: Intake: 8.9mm; Exhaust: 8.4mm Valve head diameter: Intake:29mm; Exhaust: 24mm Springs @ valve: One Valve angle (included): 23.75 degrees Valve adjustment: Shim under bucket Valve adjustment int.: 16,000 miles (24,000km) Cam drive: Silent-type chain Redline: 11,650 rpm Oil capacity: 3.8l Airbox capacity: 8.35l Clutch: Wet, multi-plate; hydraulic actuation Transmission: Cassette-type close-ratio six-speed, constant mesh Primary reduction ratio: 1.604:1 (48/77) Gear ratio I: 2.538:1 (13/33) Gear ratio II: 1.941:1 (17/33) Gear ratio III: 1.579:1 (19/30) Gear ratio IV: 1.381:1 (21/29) Gear ratio V: 1.250:1 (20/25) Gear ratio VI: 1.160:1 (25/29) Final Drive: #530 O-ring-sealed chain Final reduction ratio: 2.563:1 (16Tx41T) Ignition: Computer-controlled digital with three-dimensional mapping Starting system: Electric Alternator: 14V/350-watt output Frame: Twin-spar aluminum Front Suspension: 43mm inverted HMAS™ cartridge fork with spring preload, rebound and compression damping adjustability; 4.7 inches travel Rear Suspension: HMAS Unit Pro-Link single shock with spring preload, rebound and compression damping adjustability; 5.3 inches travel Front Tire: 120/70ZR-17 tubeless radial Rear Tire: 190/50ZR-17 tubeless radial Front Brake: Dual full-floating 310mm discs with four-piston radial-mounted calipers Rear Brake: Single 220mm disc with single-piston caliper Fuel Capacity: 4.8 gallons, including 1.06-gallon reserve Rake (Caster Angle): 23.75° Trail length: 102mm (4.0 inches) Battery capacity: 12V/10AH Spark plug: Iridium Headlight: Twin-bulb Line Beam; 55/55 watt Colors: Red/Black, Metallic Silver/Black, Black California version meets CARB 2004 emissions standards. MSRP: $10,999 USD
MO Measured Torque: 78.4 @ 8,200 RPM | |||||
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