hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Wed Dec 10, 2008 6:05 pm Post subject: Rough 912 UL Engine Operation when Pneumatically Balancing C |
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I know this issue has been discussed before. Back in May of 2007 I posted a question about Idle settings for the 912. I got a lot of good advice, but I never attempted to pneumatically balance my carbs. because the engine seemed to run so well. Now, after about 147 hours of operation on my 912 UL, I finally decided to check the carb. balance pneumatically. Prior to the test, the engine appeared to run well, it just would not idle smoothly below 1800 rpm. I finally decided to check the carbs. sync. pneumatically. A friend of mine who has done this before helped me to do the test. We followed the Rotax procedure. When we disconnected the cross over balance tube and connected the two manometers to measure the individual vacuums, the engine ran very rough and would not smooth out, or appear to smooth out, until about 3500 rpm. The mercury manometers had a differential of about 3” of mercury at 1800 rpm, and about one inch at 3500 rpm. Adjusting the throttle cable setting at the carb. had little to no effect on this differential. We then dropped the carb. bowls and both appeared normal (floats, gas, ect). Reassembled the bowls and tried again. Same results.
Any suggestions as to what the problem is?
Hugh McKay
Allegro 2000
Rotax 912 UL
147 Hrs
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