24-01-2021, 11:19 AM
Circe,
I ran a 1933 Seven in the 1970s and 80s, during which time I covered some 150k miles in it. It was fitted with the iron stick fabric coupling/6 bolt HS propshaft. I had no propshaft vibration problems. I used to cruise at 42 mph with rare excursions up to a mildly terrifying 62 mph down steep hills.
In that period the engine came in and out perhaps three times. It never occurred to me to worry about the propshaft relationships so the fabric coupling would have gone back in any of the three possible locations. I have no clue about fabric joint dynamics but I would make a bet that they are different to those of a HS joint, They do not seem to interact unfavourably in my experience.
I had noticed your point about the location of the detentes, which leads me to suggest replacement of your fabric coupling with a known good example as a first move. After that, no doubt your propshaft people have a balancing device but it would presumably need some special fixtures to accommodate the Austin shaft.
Regards,
Stuart
I ran a 1933 Seven in the 1970s and 80s, during which time I covered some 150k miles in it. It was fitted with the iron stick fabric coupling/6 bolt HS propshaft. I had no propshaft vibration problems. I used to cruise at 42 mph with rare excursions up to a mildly terrifying 62 mph down steep hills.
In that period the engine came in and out perhaps three times. It never occurred to me to worry about the propshaft relationships so the fabric coupling would have gone back in any of the three possible locations. I have no clue about fabric joint dynamics but I would make a bet that they are different to those of a HS joint, They do not seem to interact unfavourably in my experience.
I had noticed your point about the location of the detentes, which leads me to suggest replacement of your fabric coupling with a known good example as a first move. After that, no doubt your propshaft people have a balancing device but it would presumably need some special fixtures to accommodate the Austin shaft.
Regards,
Stuart