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www(at)wynne.co.uk
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 Posted: Tue Dec 11, 2007 12:12 pm Post subject: Can anyone recommend a cough mixture? |
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Please can someone suggest a cure for my rough running Rotax 912UL. The symptoms manifest as a noticeable pulsed vibration, about once a minute, through the airframe, joystick and rudder pedals about 15 minutes after start-up ie within five minutes after take-off and when revs come back under 5,000. It is as if she is trying to clear her throat and it is a little less noticeable if the fuel pump is running. I was lucky enough to acquire her (a Mono classic) quite recently (kit 33). I have tried the following:- new regulator, new spark plugs (the old ones looked perfect), ohms tested HT leads, pressured tested cylinders (virtually identical), balanced the carbs., removed stripped and pressure blown carbs, drained fuel tanks and refuelled with Super unleaded. In case it is relevant I cruise her at 4,800 rpm, at 2,000ft amsl which gives approx 118kts burning 14+lph. Today for the first time I refuelled with Avgas and was surprised to find that above 5,000 rpm the engine ran like a sewing machine and only tried to go back to her bad old ways at 4,600 rpm and below. Please could someone point me in the right direction – Thanks, Bill Wynne
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Tue Dec 11, 2007 12:20 pm Post subject: Re: Can anyone recommend a cough mixture? |
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It sounds to me like a case of old mogas.
Mogas has a number of very volatile additives which disappear
when it sits for a few weeks. The hypothesis is half confirmed
by smooth running with AVgas which does not out-date.
Try fresh mogas the next time you replenish and don't let it sit
too long before firing up.
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