Serpent Viper 989 1/8 GP (SER903018) (Kit)
The Serpent Viper 989 is the latest development of Serpent on the 1/8 gas market. Serpent has been the driving force for decades and the Viper 989 is the latest interpretation of a high performance race car based on that experience, combined with the latest insights on weight, weight distribution and flex.As the inventor of the Centax clutch, the 2-speed gearbox and many other things that are now industry standard, we also integrated some new solutions on the suspension.Another major point of development was to reduce weight, reduction of vibrations and ease of set-up and maintenance.Ultra-narrow chassis with improved flex characteristics. The chassis is milled down in less load-stressed areas to make it as light as possible and still remain stiff in areas where needed.We kept the possibility to have a weight in the very bottom which is easily adjustable in it’s position.At the same time we improved the way it is it mounted to reduce vibrations by using a carbon weight bridge which is mounted in anti-vibration rubbers.We also have added 2 more locations for another weight, one underneath the engine and another one underneath the servosaver.The central weight bridge allows the use of max 3 weightsAll weights are mounted as low as possible to improve the center of gravitiyThe one-piece plastic radiomount is replaced by a 2-piece aluminium construction. It is lighter than the plastic one, and at the same time it improves the flex characteristics and the accuracy of mounting the radioplate.The rear bulkheads are now also connected to the rearplate to improve the stiffness as well as reduce vibrations.The bulkheads are machined excessively to get the perfect balance between weight and strengthTheir shape now allows the removal of the rear solid axle without removal of the 2-speed shaft and beltThe brake now features a 2.5mm thick disc with improved ventilation and braking stabilityThe pulley adapter is a much lighter construction for better inertia and improved accelerationA new shorter internal gear ratio of 2.4 helps acceleration and increases the active range of the overall gear ratio. Using 19/24 now is almost like 18/23 on the 988.Also the overdrive has changed slightly to have the perfect rear/front drive balance with ENS and EFRA hand out tiresNew side belt tensioners improve clearance with the engine manifold.It also reduces vibrations on the sidebelt.Adjustment is easily done on the midshaftThe new super-light midshaft assembly also acts as adjustable belt tensioner as well as pipe wire holderThe completely new gearbox has less inertia than the one from the 988. This improves acceleration.Despite being lighter it offers new features to improve reliability and consistantyA much longer ramp for the roller avoiding locking of the second gear.
The wire type front anti-roll bar is ball raced. It is easy to change and adjust due to the open front end design. The standard wire is 2.5mm and 2 optional thicknesses are available. The pivot ball link system directs the suspension movement to the bar and allows easy tweak adjustment.
The steering blocks are connected to the arms with spring steel 8.5mm pivot balls, which run very smooth and well protected in nylon cups, and are easy to adjust with a 2.5 hex tool.
The black anodized aluminium front axle has Japan made one-way bearings. Spring steel drive cups connect to the long and thin spring-steel drive shafts with CVD system. The ball raced spring steel wheel axles have aluminium quick-change levers. The open front end design allows for very fast and easy removal of the front axle and driveline parts.
The central mounted seervosaver allows easy and fast Ackermann adjustment. The servosaver features a top mounted insert which can be used in 3 positions. Another 2 Ackermann positions are available on the steering blocks.
The rear end construction with aluminium brackets is a very open design, which allows for easy of maintenance and cleaning. Dis-assembly requires the removal of only a few screws. Replacing a belt if needed, is a simple task. The eccentric bearing holders on the rear shaft allow adjustment of belt tension. The whole rear end can be removed as one unit from the chassis by removal of only a few screws.
The wire type rear anti-roll bar is ball raced. It is mounted in the rear bearing blocks and is easy to change and adjust. The standard wire is 2.5mm and 2 optional thicknesses are available. The pivot ball link system directs the suspension movement to the bar and allows easy tweak adjustment.
The narrow solid rear axle in Serpent spring steel has a lightweight 9mm wide 48T pulley. The axle has a double slot for the driveshaft pin for lightness and long life. Spring steel, CVD type, drive shafts connect the rear shaft to spring steel wheel-axles with aluminium quick-change levers. A very durable and long lasting drivetrain.
The new rear lower wishbones have a hollow style design with closed bottoms for aerodynamics and separate top mounted moulded plates. The lower rear arms hold the link for the rear anti-roll bar and the alu mounting plate of the rear shocks. This plate moves the shock mounting position to the outside for improved geometry. Nylon clips are used on the lower rear pins to change wheelbase.
The durable composite uprights hold the ball raced wheel axles, with aluminium quick-change levers. On top of the up-right spacers can be added under the pivot ball to change roll centre and camber change.
Optional carbon fibre disks can be mounted on the side of the uprights for aerodynamic reasons. The rear uprights are connected to the arms with spring steel 8.5mm pivot balls, which run very smooth and well protected in nylon cups, and are easy to adjust with a 2.5 hex tool.
The adjustable rear upper camber links mount to a 4 position rear carbon fibre camber plate.
The rear floating body mount which is mounted on the up-rights with 2 arms is centred by a carbon-fibre and steel guider. The mount has 4 positions on each side to choose from, depending on body shell used and traction available. The threaded holes on the end of the body mount give the option to add further body-supports.