Ask Paul: What is the correct timing for my engine?

Q: I have a Lycoming IO-360-A1A on a Mooney E model. My mechanic tells me that there are two timing settings for this engine: 20° and 25° BTC. The engine had been set at 20° BTC and he reset it at 25° BTC. What are the advantages or disadvantages of this timing change? The engine is running slightly warmer and appears to be a bit louder in the cockpit.

DAVID WALKER, via email

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===> Posted on May 8th, 2012 by Janice Wood. No comments. © GAN 2012.

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