fbpx

 

  • Re: Ignition modules and heating gun

    by » 7 months ago


    Built 2011, only 430 hours.

    hangared since new.

    it became difficult to start over the past month or so, when previously started first attempt.

    I have a spart tester, no spark seen on top 2 and 4 cylinder.

    then upon heating the boxes with my old electric heat blower the Rotax fired up instantly, it makes a lot of noise in an enclosed hangar. But wonderful.

    I then pulled it out of the hangar into the cool breeze, put the cowling back on and then probably 10 minutes latter tried to start it again , but no luck.

    So I had to remove the cowling , get the gun out , heat it up again. 
    it fired up instantly. So I ran it till the oil temp was > 50 degrees C, DID THE mag drop tests. Turned it off, replace the cowling, started first go and went flying.

    the Ducati is not charging the battery though.

    Such is the life of an aviator Down Under.

    the ducati regulator decided to not charge the battery too.

    A frustrating time, but there has been lots of help due to the Rotax community and this site.

    I am wondering whether I need to now replace both cdi boxes, which seems strange that they fail together. Also replace the regulator rectifier too.

     


  • Re: Ignition modules and heating gun

    by » 7 months ago


    Thanks Sean, I will get some from Bert in Lilydale and a Ducati rectifier regulator too.


  • Re: Ignition modules and heating gun

    by » 7 months ago


    Thanks Roger.

    I am in Melbourne, Australia. I shall get new boxes from Bert Flood our Aussie Rotax dealer.


  • Re: Ignition modules and heating gun

    by » 7 months ago


    Graeme,

    The CDI boxes don’t necessarily fail at the same time. As you suggest, that would be very unlikely. The CDI boxes can fail in such a way that they will not function at cranking RPM, but will function at running RPM. So the starting circuit may fail in one CDI and go unnoticed because the second CDI will still start the engine. At this point both may still pass the preflight ignition check.  Later on if the second CDI box start circuit fails then engine won’t start - as you have observed.  


  • Re: Ignition modules and heating gun

    by » 7 months ago


    Graeme de morton wrote:

    Built 2011, only 430 hours.

    hangared since new.

    it became difficult to start over the past month or so, when previously started first attempt.

    I have a spart tester, no spark seen on top 2 and 4 cylinder.

    then upon heating the boxes with my old electric heat blower the Rotax fired up instantly, it makes a lot of noise in an enclosed hangar. But wonderful.

    I then pulled it out of the hangar into the cool breeze, put the cowling back on and then probably 10 minutes latter tried to start it again , but no luck.

    So I had to remove the cowling , get the gun out , heat it up again. 
    it fired up instantly. So I ran it till the oil temp was > 50 degrees C, DID THE mag drop tests. Turned it off, replace the cowling, started first go and went flying.

    the Ducati is not charging the battery though.

    Such is the life of an aviator Down Under.

    the ducati regulator decided to not charge the battery too.

    A frustrating time, but there has been lots of help due to the Rotax community and this site.

    I am wondering whether I need to now replace both cdi boxes, which seems strange that they fail together. Also replace the regulator rectifier too.

     

    Graeme de morton wrote:

    "Built 2011, only 430 hours.

    hangared since new.

    it became difficult to start over the past month or so, when previously started first attempt.

    I have a spart tester, no spark seen on top 2 and 4 cylinder."

     

    The top number 2 is fired by one coil on the A circuit.  The bottom number  4 is fired by a different coil but again on the A circuit.  it seems rather strange however as they are both on the same A box it may be an internal issue.  Heating causes higher resistance in electrical parts.  This suggests internal failure.  Repeated heating will never solve your issue as I am sure agree.  Check the module serial and part number to match it correctly.  

    The problem with charging is not related to the ignition side, this is most likely the regulator itself as you have already noted.  Do check the ground wire to be sure that the regulator is grounded back to engine.  The spade connectors are always a good place to look for damage also, they are notorious for failure on older engine harnesses.  

    Cheers


You do not have permissions to reply to this topic.