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Carburettor rubbers on Rotax 912s
I used to fly Skyranger microlights in the UK with the Rotax 912s and the carburettor rubbers were a pain in the butt as they were prone to splitting from the inside out. I was wondering if the 601 had any issues with this happening. The reason for asking is that I notice the airbox is braced to the firewall giving good rigid support to the carbs whereas on my Skyranger there was none, which obviously contributed to premature wear. As I'm new to flying Zodiacs its nice to accquire hints and tips from you high hours Zenair flyers and builders out there.
thanks
Ade
Replies to This Discussion
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Permalink Reply by Chris Aysen on
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Adrian - I'm going to go out on a limb here and venture to say that the airbox on a 912ULS does not mount (or should not) to the firewall. A mounting such as that would probably have more of a negative effect on the carb rubbers. Because of the dramatic movement of the engine on start-up and shutdown. The engine would move rather violently and the airbox would be next to stationary. My two cents. Approximately how long would the rubber mounts last on the Skyranger?
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Permalink Reply by ADRIAN KENTZER on
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On some applications, as there is no slipper clutch in the Skyranger setup, 75 - 100 hours could see carb rubbers split.
The bracing on my CH601xl is attatched to the centre of the firewall and mounted via a 'rubber bobbin' to the airbox allowing a decent amount of flex.
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You would definitely need some flex on that mount. I'll be replacing mine as soon as the new ones come in; I'm expecting them today. I found that I had to tighten them pass the recommended distance allowed on the clamp. They don't look bad but Rotax really harps on that measurement.
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Permalink Reply by Bob McDonald on
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The only way to inspect the rubber carb sockets on a Rotax 912 is to remove the carbs from the sockets. The cracks if any will be easily seen by flexing the socket and inspecting the inside of the socket. Replace sockets every 5 years as the rubber gets hard and loses flex from engine heat & age. The new sockets have a much greater life than the older model sockets. The factory air box does help with carb socket life.
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Permalink Reply by Jonathan Porter on
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We find that fuel affects life of this part. Shell V Power, in our experience can destroy one of these in a matter of hours - but we are told the V power is different around the world....
The early signs are seperation at the edges - simply gently wiggle the carb and look for a change in response during the pre-flight. We change the Carb seals every 200 hours as a matter of course.
As far as we know we have the record for carb seat issues - and it is probably mainly a mixture of fuel, vibrations (make sure that the engine is pneumatically balanced) and best to avoid low revs (warm up at 2500, and avoid below 3000 once warm.) and climate... the new models are better - look for the silver clamp instead of the 'yellow' one.
All of this is personal experience and is subjective to the West African experience... which is pretty harsh!
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