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No Sir, radials do not get run at 1950 RPM before shutdown. That is a higher power setting than a good runup. But it is true that the idle RPM is brought up to around 1000 RPM for a while and the purpose is not to burn the plugs clean -although it couldn't hurt- but to scavenge oil that has pooled in the engine case during idle operation and return it to the ...


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It could also be to remove lead deposits from the spark plugs. Some avgas has an agent added to remove lead deposits, this only works above a certain temperature which is achieved above a certain RPM. We had to do a similar procedure in the Cessna 152. As you will know, Avgas 100LL contains a compound known as Tetra Ethyl Lead (TEL) which acts as an octane ...


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According to this document, this is to allow the engine to cool and level the oil temperature: CHT Drop- Wait two minutes or until you can clearly see the H on Cyl Hd Temp. This is to allow the engine to cool and level the oil temperature. Closing down too early may damage the engine. This is most probably to prevent damage to the engine due to shock ...


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