Lycoming 0-320-A2B Vs. 0-320-B@B

PeterR

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Joined
Jan 21, 2021
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Does anyone know?
1. Why does the B2B engine have 10 more HP than the A2B?
2. Why does a Citabria 7GCBC with the 0-320-A2B engine have a ceiling of 18,100ft. and the Citabria 7GCAA with the 0-320A2B have a ceiling of only 15,000ft.
THANKS!
 
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