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Ignition Checks at Various RPMs?

DHeal

Well Known Member
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
 
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...
 
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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