13-03-2018, 07:17 PM
Hi Jon
Looking at the fabric propshaft lengths I would concur with you that the BP93 is longer than BP73 19.5” and probably shorter than BP118 26”, mainly as the index card records it as longer, but difficult to prove with out finding one and as they generally do not have a part number on them difficult to check. But looking at the part numbers and chassis numbers they are not as rare as I though unless I have my numbers wrong and putting aside that Austin probably used up old stock and what was available, also excludes sports and specials.
BP30 up to April 1923 only 2,994nr used (index cards list BP1 from chassis 2,995)
BP1 and BP28 20” 42,022nr used, difficult to be exact but BP73 starts at chassis 45,016
BP73 19.5” 72,485nr used starts from chassis 45,016 to 118,501
BP93 ?” 24,142nr used, chassis 118,501 to 142,643 (guess at first long chassis Oct 1931)
BP118 26” 34,044nr used chassis 142,643 to 176,687 (interchangeable with BP125)
BP125 114,313nr used chassis 176,687 to 291,000
But depending on the tolerance and ware on components it possible to fit a 20” propshaft in a car which should have a 19.5.” propshaft, not recommended. The BP93 may only be fractions of an inch longer.
Looking at the fabric propshaft lengths I would concur with you that the BP93 is longer than BP73 19.5” and probably shorter than BP118 26”, mainly as the index card records it as longer, but difficult to prove with out finding one and as they generally do not have a part number on them difficult to check. But looking at the part numbers and chassis numbers they are not as rare as I though unless I have my numbers wrong and putting aside that Austin probably used up old stock and what was available, also excludes sports and specials.
BP30 up to April 1923 only 2,994nr used (index cards list BP1 from chassis 2,995)
BP1 and BP28 20” 42,022nr used, difficult to be exact but BP73 starts at chassis 45,016
BP73 19.5” 72,485nr used starts from chassis 45,016 to 118,501
BP93 ?” 24,142nr used, chassis 118,501 to 142,643 (guess at first long chassis Oct 1931)
BP118 26” 34,044nr used chassis 142,643 to 176,687 (interchangeable with BP125)
BP125 114,313nr used chassis 176,687 to 291,000
But depending on the tolerance and ware on components it possible to fit a 20” propshaft in a car which should have a 19.5.” propshaft, not recommended. The BP93 may only be fractions of an inch longer.