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The new eccentric bushing system
with a 4 mm screw with references for easier camber and caster adjustment.
The “CX” braking system with 200
mm W disc and the axle bearing
carrier with the new exhaust support
The central stabilizer bar and
the new undersized spindle “C” components.
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RACING LINE - KF
The 2010 Racing chassis line takes benefit from the important development done by Birel Motorsport in agonistic field.
This constant work has allowed some evolutions on three models with Cik- Fia homologation, that are the RY 30-S2, RY 31-S2 and RX 32-S2. Among the “visible” novelties there are the “C” spindles, which will have a smaller dimension and provided with a more functional eccentric bushing system, with a 4 mm screw, able to ease the camber and caster adjustments.
Moreover, the reinforcements on the rear bearing cases have been removed, so to guarantee the chassis a better fluency. In the end, a new support of the seat has been introduced on the right part in order to improve the balance of the chassis and the place for the engines. From the production point of view, it must be underlined the excellent quality control that Birel chassis have to face during each working phase, so much that even the Racing Division races with standard karts.
From the technical point of view, the RY 30-S2 model is created with 30 mm tubes and it is characterized by a front axle design with the spindle “C” anchored to the front crosspiece and a sole torsion bar. It is very versatile and suitable for every kind of category, resulting very “free” and “fluent”. The RY 31-S2 model has the frame metal struts in 30 mm tubes, whereas the crosspieces are made with 32 mm tubes.
The “C” of the spindles are anchored at the bigger torsion bar height, where the metal struts join the front crosspiece. There are two torsion bars: the bigger one acts on the front axle behaviour and the smaller one increases the rear axle stability. This model offers a slightly higher grip compared to the 30 mm tubes version, whereas for less rubberized and slippery tracks, a better feeling can be found with the RX 32-S2 model, which has a frame completely created with 32mm tubes.
The design is very similar to the RY 31-S2 version, only differing for two foldings in the front crosspiece and behind the seat.
RY 30-S2: Is advised for categories that use soft tires and for use on rubberized tracks. But it is also excellent for the youth classes that, although using mediumhard tires, require a “free” chassis due to limited engine power.
RY 31-S2: Is advised for categories that use medium-soft tires. It is absolutely the most versatile model, adapting itself very well to all track conditions. Excellent balance is one of its strong points as is its precision when entering a curve.
RX 32-S2: Is advised for categories that use medium-hard tires. It offers an excellent grip, also adapting itself well to more slippery tracks and to drivers who prefer a precise chassis, especially in fast curves.
Novelties for 2010
The main adjustments that Birel technicians performed on 2010 Racing frames involved the upgrading of body technical specifications which were tested throughout the competitive season, with excellent results from Birel’s racing department. Major alterations regarded the spindle “C” components which, on all models, will be smaller and fitted with a new eccentric bushing system featuring a 4mm screw with references for easier camber and caster adjustment. The version will also include a new right seat support for a more balanced frame, in addition the supports on the rear bearing carriers were eliminated freeing the frame. Minor alterations also focused on exhaust support mounting, adding a bracket on the left carrier.
Set-up base
Apart from the tires and engine sizes used, the Birel technicians have identified a fairly versatile starting set up that can be used as a foundation before making changes to the chassis based on its driving characteristics and track conditions. These standard adjustments call for 2 mm of convergence opened in front, 5 mm of cambering open underneath and the caster neutral at zero; the 1040 “F” axle; the front bar and the 4th pipe anchored; the front carriage with two internal weights and the posterior one at 139.8 mm. Finally, the seat is positioned with the standard measure of 124 cm between the back and front cross beam and 22 cm between the back and the axle. The accessories (hubs, axle flanges and disc-holder) are meant to be in aluminium. With that in mind, once action is taken on the various adjustments allowed, whether on the front or rear end, it is best to remember to do only a few operations at a time. Obviously, besides the adjustments, the behaviour of the chassis can also be modified by the accessories. For example, using magnesium components, the “fluidity” can be optimized when the track becomes “rubberized” during the course of the event and the grip increases.
 Gli optional
There are some options common to the entire line for personalizing the kart based on the specific needs of each class and each driver. The most important novelty is in the possibility of using all of the magnesium Freeline components with the rear axle: hubs, flanges, brake disc holder and rim holder. This option guarantees a lighter weight compared to the standard components (in aluminium) of about 1.5 kg as well as improving the fluidity. Front hubs are also available in magnesium. It will also be possible to personalize the brake system by choosing the material for the brake disc (or discs when there are also front brakes mounted) from steel or cast iron. The first offers strong and decisive braking while cast iron allows for better modulation of the brake, also optimizing the operating temperature. The effectiveness of both is very similar, therefore the choice is linked to the feeling that the pilot has with one solution or the other. And finally, the Freeline seat by Tillet will be available.
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SPINDLES
The “C” spindles will have a smaller dimension and provided with a more functional eccentric bushing system, with a 4 mm screw, able to ease the camber and caster adjustments.
CHASSIS
The three available bodies are different due to some technical specifications and the diameter of the pipe. Common among all models is the superior construction technology and quality, while from the productivity point of view, each version although having specific prerogatives, always offers excellent versatility.
EQUIPMENT
Standard equipment includes the magnesium rims with 6 anchor points, the 50x2x1040F axle, the large spindles in the front and the components (flanges, disc carrier and crown carrier) in aluminium along with the 4th removable bar next to the seat and the new Freeline pods (complete with rear bumpers) that are lighter by about 1.3 kg.
REAR BRAKE
The system has extremely high efficiency standards. It is hydraulic with a 200 “W” disk and callipers mounted on the front of them. The disk can also be requested in steel or cast iron: along with braking efficiency, the cast iron version allows for better modulation when braking and optimizes the operational temperature.
MODELS:
DOWNLOAD SEAT POSITION DATA SHEET
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