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good day people !! My name is Raul and I live in Argentina, I have an experimental plane with a 503 rotax engine. I have a problem, and I ask if you can help me. I swapped my old single ignition engine for a ducati ignition dual carb dual ignition engine. The gearbox is 2.58 to 1, I have a warp drive propeller, when changing the motor it informs me an egt of 980, cht of 200 but it does not exceed 6100 rpm on the ground. The engine was replaced with rings and the cylinders were burnished. Could someone tell me why it is under the egt? The jet that it has is 148. Thank you !!!! greetings from Argentina.-

 

buen dia gente !! mi nombre es Raul y vivo en Argentina, tengo un avion experimental con un motor rotax 503. Tengo un problema, y pido si me pueden ayudar. Cambie mi viejo motor de encendido simple, por uno de doble encendido con doble carburador y encendido ducati. La reductora es 2.58 a 1, tengo una helice warp drive, al cambiar el motor el mismo me informa una egt de 980, cht de 200 pero no pasa de las 6100 rpm en tierra. Al motor se le cambiaron aros y se bruño los cilindros. Alguien podria indicarme porque es bajo el egt?, el chicler que lleva es 148. gracias !!!! saludos desde Argentina

  • Re: rotax 503 - consulta

    by » 3 months ago


    Good Day Raul,

    The dual CDI/dual Carb 503 should have the following carburetor jetting.

    Main Jets should be: #158

    Idle Jet should be: #45

    Jet Needle should be: 11K2

    Needle Jet should be: 2.70

    Those are the factory jetting settings.

    The air/idle screw should be turned out only 1/2 turn.

    These will give you a good starting point..  Adjust the propeller so you get 6250 to 6300 rpm on txhe ground (static).

    At full throttle you should see an EGT of 850 to 1050 (depending on accuracy of gauge),  The EGT should creep up to

    1050 to 1100 at 5800 prm and will near 1150 at 5000 rpm.  All of this is based on a sea lever/standard day.

    The 148 main jets you mentions are very small for this engine and would surely limit the rpm.

    Let us know how you make out with sorting this issue.

     

     

     


    Thank you said by: RotaxOwner Admin

  • Re: rotax 503 - consulta

    by » 3 months ago


    Thank you very much for the help this weekend I will try it and let you know, I am very grateful!

    The crescent of the needle in which position should it go?

    All the best

    Raul Castellano

    Argentina

    ============================

    Muchas gracias por la ayuda este fin de semana lo voy a probar y les informo, estoy muy agradecido !!! La medialuna de la aguja en que posicion debe ir?.

    Un saludo

    Raul Castellano

    Argentina


  • Re: rotax 503 - consulta

    by » 3 months ago


    Bob me olvide, donde vivo estoy a 500 metros sobre el nivel del mar. Mantengo igual esa configuracion? SALUDOS, Raul

    29051_2_WhatsApp Image 2021-03-09 at 14.15.05.jpeg (You do not have access to download this file.)

  • Re: rotax 503 - consulta

    by » 3 months ago


    That's a neat looking clean design. What is it?


  • Re: rotax 503 - consulta

    by » 3 months ago


    Buen dia !!

    Se llama Don Quijote J1b, y tiene 28 años.

    Saludos

    RC


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