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Home Onroad RC Serpent Viper 977 EVO Nitro

Serpent Viper 977 EVO Nitro

Serpent Viper 977 EVOJust a day after showing us the first sneak peek photo of the new car, Serpent officially announces the Viper 977 EVO! Based on the previous model Viper 977, the EVO is packed full of new features including a flex optimized 7075 T6 aluminum chassis, super low inertia 2 speed gearbox with composite gears, hard coated aluminum clutch gears, carbon fiber 2.5mm radio plate with aluminum mid flex system, new front bumper with inserts and improved body mounts. As always we’ve got tons of pictures of the new Serpent Viper 977 EVO after the jump.

Serpent Viper 977 EVO
Serpent has been developing 1/8 scale onroad RC cars since 1977, officially as company since roughly 1980. That is over 35 years of of race and development experience combined! The Serpent Viper EVO is the next step in the continuous development of this very demanding 1/8 scale racing class, the pinnacle of RC car racing. The Viper 977 EVO is all about refinement, to make a superb car even better.

The Serpent Viper 977 EVO chassis plate is a very important part as central unit in the car. The flex-characteristic is a major point, as well as weight balance with the sliders we apply and the dissipation of heat from the engine. The chassis is narrower in the front to allow a slightly different geometry. 2 sets of front lower pivot pins holders are included to change the geometry, run it narrow or wide. Machining of the chassis allows flex in a different area as before, and can be influenced by using the carbon brace. The narrower chassis in front allows to run a slightly different geometry in the front.

5mm aluminum Viper 977 EVO chassis in perfect symmetrical shape for even flex and weight distribution. Aerospace quality 7075 T6 aluminum with engraved logo. Improved stiffness around the engine for better engine performance. Countersunk holes, chamfered edges for more cornering, ground clearance. Space in center part of the chassis to allow mounting of brass sliding weights, which are used as set-up tool, to play with chassis balance. This has big influence on steering, grip and tire wear and is very easy and quick to change. All screws from the bottom are with 2.5mm allen size.

Central flex
The Serpent Viper 977 EVO central flex system consists of a lower and upper anodized aluminum section, connected with screws for zero flex, or with bearings inside for some controlled flex. It needs removal of only 2 screws to go from fixed to controlled flex.

Radio plate
The stiff carbon fiber radio plate is one piece again with the flex system moving to the center of the car, just behind the tank.

Centax hard coated aluminum clutch gears
To go with the 0.9 pitch gears, the Centax gear pinions also needed to go to the 0.9 pitch. The precision machined and hard coated gears are durable and smooth. The Centax clutch is a Serpent innovation from the early nineties, and is in use by almost all brands now.

The newly developed Serpent Viper 977 EVO front aero type bumper is a very durable unit, which as extra feature offers removable inserts. Its very easy and quick to test with or without inserts in a matter of seconds. The strong aerodynamic shaped composite bumper. The upward edges make it more stable, so these wont touch the surface under impact or with high temperatures. As extra feature offers removable inserts. Its very easy and quick to test with or without inserts in a matter of seconds

Rear Body Mount
Extra ribs and more material is added to increase the stiffness of the rear body mount and a 4th hole is added both sides for more tuning options

Front Body Mount
The durable composite front body posts are excentric, to allow moving the body to front or back a few mm to optimize steering / downforce.

The Serpent Viper 977 EVO steering blocks, which can be mounted left or right, offers a system to change the axle position more to front or back giving a “trailing” or “leading” steering, and the ability to change the kingpin-inclination and offset. The steering block features an aluminum plate to connect the steering-rods, 2 options for Ackermann. The spring-steel steering-rods are fastened to the aluminum steering plates, which mount to the new steering blocks. Optional carbon fiber disks can be mounted on the side of the uprights to stiffen the assembly and for aerodynamic reasons.

Front Suspension
The long durable front lower wishbones, are mounted super low in the car, and feature a semi covered “leg” for the inner suspension pin and the pivot link for the front anti-roll bar system, its also has an extension for the down-stop screw . The lower arms hold the lower aluminum shock mount plate, which allows a further out and higher mounting point for the front shocks. The strong upper arms in can be used left and right. The Viper 977 EVO front lower arms connect to the aluminum front bracket on very low nylon holders. The kit includes 2 versions, wide and narrow. This whole system also enables you to replace a front driveshafts very quick and easy.

The longer upper arms are mounted between the anodized aluminum top brackets, which also hold the suspension pin inserts to allow camber-change adjustments with 3 possible inserts . Below the aluminum top-brackets spacers can be used to change angle or height. Caster spacers are used as simple clips on the upper pivot pins. Same clips are also used on the lower pins to change wheelbase.

Anti Roll Bars
The ball raced front anti-roll bar is a wire type, with very easy and fast open access on the front, captured in the aluminum front braces. The standard wire is 2.5mm and 2 other as options. The pivot balls link system directs the power to the bar in a smooth way and easy to adjust the tweak with the captured pivot ball.

Front Axles
In the front the aluminum front axle with Japan-made one-way bearings features now an improved pulley assembly, free of play and super-true. Spring steel drive cups, strong, long and thin spring-steel driveshafts with CVD system, and ball raced spring steel wheel axles with aluminum quick-change levers. The open front end design allows for very fast and easy removal of the front axle or parts.

Servo Saver
The spring loaded servo-saver allows easy and fast Ackermann settings. The servo-saver features a top mounted insert which can be used in 3 positions. Another 2 Ackermann positions on the steering blocks.

Radio Plate
The Viper 977 EVO radio plate holds the fuel tank, the receiver battery and the integrated electronics bracket/box, as well as the center flex system Compact composite brace and box in one, which holds and protects the receiver and mounts both servo’s, which both lay on their sides, as low as possible, just a small clearance to allow for chassis flex. The cap of the receiver box offers a unique yet simple and safe holder for the cable connectors of the receiver, which works as a simple switch and is very accessible. The optional carbon transponder brace mounts to the integrated electronics brace. When using a small receiver, the box has space to hold the transponder too, but must be tested for function before the race. In our test it worked.

Fuel Tank
Low 125ccm fuel tank in a long and narrow design, with a premounted bronze filter. The narrow tank will ensure a better fuel-supply to the engine, as the fuel can move less from side to side. The labyrinth inside the fuel tank will also keep the fuel more stable and avoids foaming. The tank also has elevated sections in the front, which make sure the fuel stays close to the filter when the tank is almost empty. This creates like a warning signal a few seconds before the tank goes fully empty, so you can try to find a safer place to park. The fuel tank has a strong spring loaded cap and silicone rubber shaped seal, and has a connection for the pressure line. The inner bottom of the tank allows for mounting inserts to reduce volume if needed.

Mid Shaft
The light, hollow 8mm hard coated aluminum middle shaft is kept rigidly in place a small, low placed and light aluminum holder, which also holds the spring-type exhaust-wire.

All the super round and true pullies have holes in the side flanges to allow dirt and dust to move out easier. The 977 has the latest pullies, with more teeth, so larger diameter which makes the belts run smoother, with less friction. The belts are low friction type as standard, rear one as 8mm, side in 6mm and front 6mm too. The adjustable ball bearing supported belt tensioner keeps the side belt running smooth.

Engine Mount
The low seated anodized aluminum engine mounts keep the engine well positioned and aligned and transfer heat to the chassis in the best way.

The brake is on the rear axle, next to the solid axle pulley. This reduces the inertia effect of the brake disc a lot because the rear axle spins much slower than the two speed shaft. Also the brake-stress on the rear belt is almost gone. It’s a very compact system and well protected against dirt, but still open enough to allow for sufficient cooling. The swimming ventilated brake-disk rotates on the rear axle and the spring loaded cam-operated brake pads will provide all the stopping power you may need. The race brake pad material is baked on strong steel plates and allows very precise braking with lots of brake-feel / feedback. Instead of a cable we opted for the well-proven wire-linkage of all Serpent cars. The ball raced brake activator is bolted in a light aluminum holder to the right rear bracket.

Rear Suspension
The long durable rear lower wishbones can be used left and right. The lower rear arm holds the low mounted link for the rear anti-roll bar and holds the aluminum mounting plate of the rear shocks, which allows a position which is very far to the rear and to the outside for best performance/ geometry. The Viper 977 EVO lower arms also hold the easily accessible down-stop screws. Nylon clips are used on the lower rear pins to change wheelbase.

The shock absorbers are the latest Serpent RCM units with membranes. The threaded houses with setting-nuts ( o-ring inside) makes ride height changes easy and precise. The RCM shocks are very smooth, and easy to assemble and fill. The shock springs are selected, matched, flat grinded, color coded units, equal length front and rear.



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