Rotax V990
From GummyCarbs
General Specifications
Weight
The December 2001 V990 workshop manual lists the engine weight as 143 lbs. The October 2003 V990RR workshop manual lists the engine weight as 148 lbs.
Displacement and Compression Ratio
According to the December 2001 V990 workshop manual:
| Displacement | Compression Ratio | ||
|---|---|---|---|
| RSV, RSV-R Tuono, Mille | |||
| Up to 2000 | 997.6 cm³ | 11.4±0.5:1 | |
| 2001 and later | 998.00 cm³ | 11.8±0.5:1 | |
| SL Falco | |||
| Up to 2000 | 997.6 cm³ | 11.4±0.5:1 | |
| 2001 and later | 998.0 cm³ | 11.8±0.5:1 | |
| RST Futura | |||
| 997.62 cm³ | 11.8±0.5:1 | ||
| ETV Caponord | |||
| 998.00 cm³ | 10.4±0.5:1 | ||
Cam Timing and Lift
According to the December 2001 V990 workshop manual, the RSV Tuono, RSV-R Mille, and SL Falco all have the same 262° intake and 259° exhaust. The 2001 and later RSV Tuono and RSV-R Mille have a 0.45in (11.40mm) intake lift, and all other intake and exhaust valve lifts for the RSV Tuono, RSV-R Mille, and SL Falco have a 0.42in (10.60mm) intake and exhaust valve lift. The RST Futura has 259° intake and exhaust, with 0.42in (10.60mm) lift. The ETV Caponord has 242° intake and exhaust, with 0.37in (9.5mm) lift.
Slipper Clutch
Pneumatic Power Clutch/slipper clutch/PBTL System details are in this apriliaforum post.
PBTL SYSTEM
The PBTL system on the RSV 1000 reduces the ‘braking’ torque transmitted by the engine during deceleration.
OPERATING PRINCIPLE:
Line 1 is connected to the intake passage whereas line 2 – downstream of the retaining valve – is connected to the airbox via the throttle valve. Line 3 links line 2 to the airbox when the throttle valve opens to an angle greater than 10-12 degrees.
During deceleration, the system configuration is as shown in the figure.
The negative pressure in the intake passages is transmitted to the clutch membrane via line 1+2.
The ‘retaining’ valve (non-return) comes into play and stabilises the pressure in the line.
Consequently, the clutch discs slip and reduce the torque.
During acceleration (throttle valve >12°), the valve, connected on the throttle unit axis, links up line 2 with the airbox, thus cancelling out the pressing effect on the clutch unit and taking the clutch pack back to its original position.