Erik Buell Racing 1190RX
Erik Buell Racing has answered that question many bikers have been asking by the unveiling of this 1190RX. The 1190RX has a 72-degree, liquid-cooled V-twin engine with a 106.0 x 67.5mm bore and stroke (1191cc), making a claimed 185 peak hp at 10,600 rpm. Peak torque, which on hi-po bike engines is often just 1500 revs below peak power, is way down at 8200 rpm and is 101.6 lb.-ft. That wide region of strong torque equals acceleration and rideability.
EBR worked hard on the RX’s midrange, combining a swirl port that flows strongest at low throttle with staggered opening of the intake valves to achieve old-time rotary charge swirl that speeds up midrange combustion, giving the added benefit of very low unburned hydrocarbon emissions.
Consider the RX’s high 13.4:1 compression ratio. The danger with high compression in such a big cylinder is that combustion may not be able to outrun the chemical processes leading to detonation. In this RX, fast combustion clearly wins the race, making it practical to gain gobs of torque from such high compression. If you run the numbers at peak torque, RX makes combustion pressure that many a pure racing engine would dearly love to have.
1190RX Specifications
| Engine | |
| Type | ET-V2: 72° V-Twin, Liquid Cooled, Four-stroke |
| Bore x Stroke | 4.17 in. x 2.66in. (106 x 67.5 mm) |
| Displacement | 72.6 cu in. (1190cc) |
| Compression Ratio | 13.4 : 1 |
| Fuel Delivery | Electronic Fuel injection with 2 port injectors and 2 showerhead injectors |
| Exhaust | Primary + Secondary |
| Peak Torque | 101.6 ft-lbs. @ 8200 rpm (137.8 Nm @ 8200 rpm) |
| Peak Horsepower | 185 hp @ 10,600 rpm |
| Drivetrain | |
| Primary Drive | Gear Drive 36/65 |
| Final Drive | 520 Z-ring chain, 16/41 |
| Clutch | Hydraulic actuation, vacuum operated slipper |
| Transmission Ratios: | |
| 1st | 2.46 |
| 2nd | 1.75 |
| 3rd | 1.38 |
| 4th | 1.17 |
| 5th | 1.04 |
| 6th | 0.96 |
| Dimensions | |
| Overall Length | 80.3in. (2040mm.) |
| Overall Width | 29.0in. (737mm) |
| Overall Height | 43.7in. (1110mm) |
| Seat Height | 32.5in. (826mm) |
| Ground Clearance | 4.7in. (120mm) |
| Rake | 22.4° |
| Trail | 3.80in. (96.5mm) |
| Lean Angle | 55° |
| Front Tire | Pirelli Diablo Rosso Corsa 120/70 ZR-17 |
| Rear Tire | Pirelli Diablo Rosso Corsa 190/55 ZR-17 |
| Fuel Capacity | 4.5 gal (17.lL) |
| Weight (Wet, no fuel) | 419lbs. (190kg) |
| Load Capacity | 375lbs. (170kg) |
| Chassis | |
| Frame | Aluminum frame with integral fuel reservoir |
| Swingarm | Optimized stiffness aluminum |
| Front Suspension | Showa, inverted big piston front forks |
| Rear Suspension | Showa, single shock without linkage |
| Front Wheel | 17 x 3.5 Aluminum |
| Rear Wheel | 17 x 6.0 Aluminum |
| Front Brake | 386mm (15.19in.) Single perimeter rotor, 8 piston inside-out caliper |
| Rear Brake | 220mm (8.66in.) Disc, 2-piston Hayes Performance Brakes Caliper |
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