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  #1  
Old 08-28-2019, 08:42 AM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 827
Default Ignition Checks at Various RPMs?

Occasionally I would like to verify the independent operation of each of the ignition modules on my 912 ULS at times and RPMs other than during the usual 4,000 RPM run-up. Is there any danger to the engine if I perform an ignition check at 2,000 RPM?, 3,000 RPM?, 5,500 RPM?, etc?

I know that an after-fire event in the exhaust system is typically a concern on some engines if too much unburned fuel is introduced into the exhaust system following an ignition check at high RPMs. Any concern here for the 912 ULS?

Thanks -- David
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David Heal - Windsor, CA (near Santa Rosa)
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  #2  
Old 08-28-2019, 09:44 AM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
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I check ignitions often while flying especially if flight plan takes me over water. Simply shut off one ignition at a time and look for RPM drop. Goes without saying to be careful not to shut off both ignitions otherwise you'll be flying a glider...
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  #3  
Old 08-30-2019, 09:34 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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From the ROTAX course it appears the only think special about4000 RPM is to be at a high enough RPM where carb imbalance is not a issue for rough running.
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