Snowmobile Buran: characteristics, fuel consumption

Specifications

Description and technical characteristics of Buran-640:

Dimensional data

Overall dimensions of the Buran ADE snowmobile track:

• length - 2.87 m;
• width - 0.38 m;
• height - 0.075 m.

Vehicle dimensions: 2.7 * 0.91 * 1.33 m, weight - 285 kg.

Box dimensions

Buran 4TD is equipped with boxes whose size is 2.42 * 1.06 * 1.13 m.

Suspension

There is an elliptic spring front suspension and an independent rear suspension equipped with a balanced spring.

The travel of the front and rear mechanisms is 5 cm. The number of front springs is 1.

The snowmobile suspension design includes the following elements:

• bearing shell;
• outer hub;
• star;
• internal type hub;
• shaft;
• mounting bolts and nuts;
• sleeve;
• video clip;
• ski;
• axial device;
• clamp;
• buffer;
• steering column;
• cuff;
• thrust washer;
• sprocket driven type of chain drive;
• retaining ring.

The spring assemblies are attached to the ski sole brackets. The ends of the root sheet should be secured with cotter pins. The longitudinal movement of the springs is carried out by sliding along the bronze liner of the front tip of the main leaf.

The bearings, pin and guide axis of the handle must be treated with special lubricant.

Mover

This snowmobile is equipped with a caterpillar drive unit equipped with drive-type sprockets. Number of track mechanisms - 2. Type of track - reinforced with plastic rods, made of rubber and fabric. The tension mechanism is screw, the height of the lug devices is 17.5 mm.

The propulsion unit converts the energy of the power unit through interaction with the environment. The traction force is created by rewinding the caterpillar tracks.

The large contact area of ​​the tracked belt device with the soil makes it possible to ensure low ground pressure and a high level of maneuverability.

The propulsion device includes the following mechanisms:

• drive wheel;
• caterpillars;
• track rollers;
• support rollers;
• tension mechanism with sloths.

This mechanism allows you to increase maneuverability and extend the life of the vehicle.

Transmission

This snowmobile has a transmission in the form of a variator and gearbox. The variator consists of a V-belt drive with automatic change in the working diameter of the drive shaft of the Buran snowmobile track.

The variator design includes:

• a drive pulley equipped with a centrifugal regulating device;
• driven pulley equipped with a cam-type clutch.

The gearbox consists of:

• crankcase;
• reverse shaft;
• gear shift devices;
• chain tensioner.

The gear shift mechanism is installed on the housing cover and consists of an axle device, a shift fork, and a spring-loaded ball that fits into the groove of the axle. A plastic plug with a venting hole is screwed into the lid.

The tensioner is located at the bottom of the housing. The tension is adjusted by turning the tension shaft. To check the chain, the design includes a special inspection ring.

Brakes

The snowmobile is equipped with mechanically driven disc brakes. The design of the brake system includes the following mechanisms:

• main brake cylinder block;
• vacuum type amplifier;
• a device that regulates pressure in the rear brake mechanism;
• ABS unit;
• working brake cylindrical elements;
• working circuits.

The main brake cylinder converts the traction force, which is transmitted from the brake pedal, into fuel fluid pressure in the system and distributes it across all operating circuits.

In order to increase the force that creates pressure, a vacuum hydraulic drive booster is needed.

The regulating device reduces the pressure level in the brake drive of the rear wheel elements, which makes it possible to increase the braking efficiency of vehicles.

The circuits consist of closed pipelines that connect the main cylinders and wheels.

Operating Parameters

Overview of operating parameters:

Basic equipment

The basic package includes:

• starter;
• reverse type transmission;
• heated handles;
• windshield;
• rear towbar;
• speedometer;
• odometer.

Lighting engineering

This modification of the snowmobile is equipped with projector headlights model 17.3711010. They consist of a body, a bezel and an optical device. The lamp is attached to the optical mechanism using a spring latch. There are 3 pins that are needed to connect the plug connector. Using screws, you can adjust the headlights in a horizontal or vertical position.

The rear light is located on the rear suspension housing, to which it is attached with two screws. The design of the lantern includes: base, lamp, socket, glass.

There are 2 safety devices on the vehicle: 15 A and 30 A. They are designed to protect the electrical circuit of the ignition system and engine.

The brake light is located on the steering handle. It turns on the snowmobile handbrake lamp by closing the switch contacts.

Engine

The Buran RMZ-640 snowmobile engine has the following technical indicators:

Some models are equipped with a Lifan engine for the Buran snowmobile. Technical indicators:

Technological parameters

The above information is just a story that needs to be confirmed by calculations. This will help the owner understand which chain was high-strength and high-quality. As a result, the main characteristic for these products is the minimum load. As for the first type, which has a pitch of 12.7 mm, it could break under a load of 3180 kN/kgf. The second type had a strength of 1700 kN/kgf, and the last one - up to 2000 kN/kgf.

From this analysis, it can be understood that the outdated model of the 1970s had almost 2 times the strength of future versions. In addition, snowmobilers confirm the quality, high strength of this product, and its efficiency during operation.

The modern version of the Buran snowmobile, according to the motosneg source, is equipped with chains from the 1980s, but there are also types with models from the 70s. Visually, you can distinguish both samples, because they have different side plates from each other. Products from the 1970s have a rectangular plate, but newer ones have a figure eight shape. The diameter of the bushing is also different, and therefore it is impossible to replace one part with another.

Repairs and breakdowns

Main malfunctions and ways to eliminate them:

1. If the engine does not start, it is necessary to disconnect the ends of the fuel pipe and bleed the system, wash all filter elements, clean the vent hole, and replace gasoline.
2. If there is no spark at the spark plug electrodes, you should check the mechanism for damage and defects, clean the spark plugs from carbon deposits, and adjust the gap.
3. If the gearbox chain breaks, it is recommended to replace the chain mechanism; to do this, you will need to remove the track.
4. If the gearbox turns off while driving, the entire mechanism should be disassembled, the spring and other worn parts should be replaced.
5. If oil fluid leaks from the gearbox, it is necessary to adjust the cuffs and replace damaged and worn parts.
6. If the snowmobile does not develop full power, it is recommended that the track belt tension and alignment be adjusted.
7. If leakage occurs through the shaft seals, they must be replaced.

Tuning

Tuning Buran 4TD involves improving the main components and mechanisms. You can additionally install attachments that will not only increase some of the technical performance of the vehicle, but also help increase its service life.

Tuning makes it possible to protect the suspension mechanism and transmission from premature wear.

Improving the motor will allow the equipment to start even at low ambient temperatures. If you install heated handles and seats, you can increase the walking time in cold weather.

In order to use transport in areas with a lot of snow, it is recommended to install an extended ski model.

Installing a roof rack helps improve safety when colliding with an obstacle or during a vehicle rollover.

A cover on the steering mechanism will help soften impacts in accidental collisions, and installing additional rear-view mirrors will help expand the viewing angle.

Types of chains

Products for Buran vary in strength and shape:

• model of the 70s - rectangular - 3180 kN/kgf;
• model of the 80s - figure eight shape - from 1700 to 2000 kN/kgf (improved).

It is noted that in terms of its breaking characteristics, the chain of the second type is of the highest quality - this is the model of the 80s. But due to the design features, the product may damage the gear. Despite the lower strength of the outdated model, it does not “bite”, unlike the new one.

In the table you can familiarize yourself with the types of products and their characteristics, which were obtained in tests performed on special equipment.

Table of chain varieties

Along with 2-row products from Russian and foreign manufacturers, many snowmobile owners began to purchase tuning kits for 3-row chains for subsequent installation in the Buran gearbox. It is an innovation that allows the owner to feel more confident when riding a snowmobile.