GR-3 040/EM/12
RRP
El IAME GR-3 es el nuevo proyecto desarrollado por IAME para competir en la clase FIA Karting Mini.
Esta excepcional unidad de potencia combina la experiencia decenal alcanzada por IAME en esta categoría específica del deporte del Karting con la última tecnología derivada de los motores Campeones del Mundo Reedster V. El resultado es un diseño totalmente nuevo que ofrece un rendimiento increíble. Mejor refrigeración que nunca, potencia impresionante desde el primer momento, aspecto atractivo, componentes de alta gama y mecanizado de la mejor calidad.
El GR-3 es el nuevo punto de referencia a superar y está aquí para formar a los campeones del futuro.
FILOSOFÍA DE DISEÑO
Iame GR-3 es la 60cc definitiva con homologación internacional CIK-FIA, concebida para competir al más alto nivel para los más jóvenes, tanto en pruebas nacionales como internacionales.
El diseño ha partido de los siguientes fundamentos:
- “La cantidad adecuada de material, en el lugar adecuado”, como en el motor de un avión
- Refrigeración mejorada del cilindro
- por una superficie y espesor adecuados de las aletas,
- por la forma estudiada de los transportadores de flujo lateral
- Refrigeración mejorada del cárter mediante una combinación de aletas verticales y horizontales capaces de capturar el flujo de aire uniforme y turbulento.
- Conductos optimizados de entrada, escape y transferencias, resultado de más de un año de desarrollo.
- Salida específica máxima
- Rango de RPM controlado según el Reglamento
- Embrague centrífugo seco (tipo CIK-FIA)
- Transmisión de cadena muy cerca de la línea central del motor para reducir la flexión del cigüeñal y la fricción relacionada.
- Arrancador eléctrico
CYLINDER
The cylinder, made by gravity casting in high-strength aluminum alloy, it is a completely new design. On an air cooled cylinder the thermal efficiency and the structure stability have the same great importance of the fluid mechanics in the internal ducts. Fins’ shape and extension, combined with fins’ thickness and profile allow the heat to be transferred from the cylinder body to the flowing air.
Air flow conveyors force the air between the fins assuring the maximum possible air flow. “The right amount of material, in the right place” concept makes robust structure without negative heat accumulation. The cylinder is provided with thick cast iron liner, manufactured in IAME by precision 5-axis CNC machines. The tight manufacturing tolerances guarantee the consistency of performance throughout the production.
CYLINDER HEAD
The cylinder head is subject of accurate fins’ design in order to get the correct temperature in the combustion chamber.
In particular the correct air flow is induced between the base fin of the cylinder head and the first fin of the cylinder.
The shape of the central vertical fin allows the use of racing type spark plugs and spark plug caps.
CRANKSHAFT
The crankshaft is composed type, with 18mm crankpin and 20mm main bearing journals, On a 60cc engine, the crankshaft must guarantee the best compromise between good stability and reduced friction. The plastic stuffers for balance are made by additive manufacturing.
Both crankshaft and crankpin are made by forged steel, casehardened and grinded.
CONROD
The conrod, completely CNC machined from forged steel, has very thin “knife style” body. The design is particularly lightened for the best performance, and it´s supported by precision roller cages on bith ends.
MAIN BEARINGS
The main bearings are special roller bearings, able to give a significant contribution to crankshaft alignment during engine operation, thus reducing friction.
PISTON
The piston is casted with a particular high-silicon alloy. It is a typical two stroke design with one “L” ring, chromium plated.
CRANKCASE
The crankcase is built with a particular sand casting process, able to give the material the maximum possible strength and resilience.
Particular attention has been paid to crankcase cooling, keeping into account the turbulent and relatively slow flow able to reach the crankcase.
TRANSMISSION
The transmission is via centrifugal clutch (unique CIK-FIA design) The chain line is extremely close to engine’s center in order to reduce crankshaft flexion and bearings solicitations.
IGNITION
The ignition is digital, with 14.000rpm limiter, CIK-homologated
EXHAUST
The exhaust is one-piece, with unique CIK-FIA design.
ELECTRIC STARTER
The electric starter acts on a bi-metallic starter gear, which combines high resistance and long life with low inertia.
CARBURETTOR
The carburettor is Dellorto PHBG18, floating chamber as specified by Regulation.