The Kart Shoppe

2010 Birel KF Chassis

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.

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.

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:

RY 30-S2	RY 31-S2	RX 32-S2

DOWNLOAD SEAT POSITION DATA SHEET

RY 30-S1

RY 31-S1

RX 32-S1

HOMOLOGATION

25/CH/14

26/CH/14

79/CH/11

FRONT STABILIZER

STANDARD

DOUBLE

REAR STABILIZER

OPTIONAL

SIDE STABILIZER

STANDARD

Ø TUBES

30/32

32-(30)

WHEEL BASE

1040

REAR WIDTH

645

FRONT WIDTH

715

LENGTH

1600

AXLE

50X2X1040F

Ø SPINDLE

BRAKING SYSTEM

HYDRAULIC CX

BRAKE POSITION

REAR (FRONT OPTIONAL)

FRONT BRAKE DISC

150X4 A/150X6 G

REAR BRAKE DISC

200X7 A/200X9 G

TANK CAPACITY

10 LIT CA

STEERING WHEEL

320 MTS

DISK CARRIER

50 HQ

CROWN CARRIER

50 HQ

FRONT HUBS

85 HI-TECH

REAR HUBS

50X95 HI-TECH

WHEELS

DF130+DF210

PODS

CIK 09-14

ALL DATA ARE IN MILLIMETER

All of the 2009 models have a series of “large” front spindles with a diameter of 25 mm A, characterized by the possibility of varying the shaft (varying the materials) by using a specific key that is supplied with the kart. The versions with front brakes have the steel action lever B housed on the steering wheel hub, while each chassis has a series of new adjustable machined footrests C.

FRONT BRAKES
They are optional for the KF classes where they are admitted by regulation. The discs are 150, available in steel or cast iron, while the control is manual, on the steering wheel. Necessary when passing, they are not to be passed up in the competitive arena.

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 holder and rim holder) in aluminium along with the 4th removable bar next to the seat and the new Freeline housings (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 200x7 “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.

2009 Birel KF Chassis

BIREL RACING LINE - KF

The new CIK-FIA certified chassis for the 2009-2014 period will be: versions RY 30-S1 and RY 31-S1 Alongside of these will be the tested RX 32-S1 (with certification valid until 2011), that is more advanced compared to the past season.

The three models available for the KF classes have features that are often complimentary so that, in a competitive environment, almost all teams make at least two versions available to their drivers. That is in order to find the best productivity regarding the tires used, the conditions and the configuration of the track. Let’s look at the principal features of each of the Birel KF models for the 2009 season.

RY 30-S1: the body is made of 30 mm pipes and is characterized by a front axle design that has the “C”s of the spindles anchored to the front crossbeam. Also in the front zone there is a single torsion bar. It is especially advised for use with soft tires and on rubberized tracks. But, due to the torsion characteristics of the body, it is also very effective in the youth classes (for example the KF3) where, usually, hard tires are used. Ending up very “free”, in fact, takes the best advantage of the limited power of the engines used in these classes. The removable 4th bar next to the seat is also functional in this sense.

RY 31-S1: the body cross-members are built with 30mm pipes while the crossbeams are 32 mm. The profile is a recalculation of the previous model R 31 with the spindle “C” anchored at the height of the largest torsion bar where the cross members meet at the front crossbeam. Also in the front there are two usable torsion bars, with the larger one acting on front end behaviour and the smaller one increasing the rear axle grip. This model is an excellent compromise for versatility, adapting itself very well to both soft and medium-hard tires. Its strong point is its excellent fluidity and the general balance between the front and rear ends.

RX 32-S1: the body is entirely built of 32 mm diameter pipes. The design is very similar to the RY 31-S1 version with the only difference being (besides the diameter and some technical specifications of the pipe) that there are two bends in the crossbeam in front of the seat and the one behind it. This model is particularly advised when grip is needed, thus for barely rubberized tracks, low temperatures and with the use of mediumhard tires.

Novelties for 2009
Among the most significant novelties introduced with the new certifications is the new model RY 30-S1 (made with 30 mm pipes). A conventional one, it allows the driver to easily find an excellent set-up offering excellent performances for all uses: from the youth classes up to the top categories. On the other hand, models RY 31-S1 and RX 32-S2 are advanced in comparison to the previous certification. Both versions were updated, especially concerning the technical specifications of the pipe. Among the prerogatives and the equipment common to the entire line, there is the removable 4th pipe at seat height (removing it “frees” the chassis at the rear axle while more grip is guaranteed with it in place) and the new “large” front spindles with a diameter of 25 mm characterized by the possibility of varying the shaft (with material alternatives as with the axles) using a special key that is supplied with the kart. The housings used are the “FL 09- 14” (with new graphics) that maintain the aesthetic lines of the previous ones but that were optimized with their weight reduced by about 1.3 kg. Finally, on the entire line, there is an HQ exhaust support in order to facilitate mounting the rear housing and a new machined foot rest.

Basic set-up
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 123.5 cm between the back and front cross beam and 22 cm between the back and the axle (see pag. 29). 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.

The 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.

MODELS:

RY 30-S1	RY 31-S1	RX 32-S1

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 medium-hard tires, require a “free” chassis due to limited engine power.	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.	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.