Hi Al I do happen to know a little about the 175 If you will excuse me for
butting in . It was a fine engine the problem arose out of misuse. pilots would
not throttle the engine up to it's operating rpm they were used to 2300 2400
rpm and I believe it ran about 3200rpm I'm not sure but the engine was quiet
and vibrationless.
                                                         ebriggs

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