13-04-2022, 05:26 PM
(12-04-2022, 08:59 AM)Ruairidh Dunford Wrote: I have found that none of the newly made crankshafts I have fitted are symmetrical in this area.
The best that can be achieved is a central position that misses both troughs, statically. Austin cranks are perfectly symmetrical in this area and jets line up on both sides. Even with the asymmetrical positioning on the new cranks, little problem is ever reported, this includes the several hundred I have fitted and makes me think that lubrication at revs come more from mist than a little low pressure oil jet.
All the Austin made 1 5/16" cranks that I have seen have asymmetrical oil troughs.
1 and 4 are at 5 3/8" centres
2 and 3 are at 5 1/8" centres
I don't have a crankcase to hand to check the oil jet centres but I wouldn't be surprised if they were at 5 1/4" centres.
This detail is from the factory drawing of 7th February 1950