Got the shells out of the moulds today after a bit of a fight. The consequence of the quick and dirty design of the moulds, especially the return flange on the top edge.
Not bad really but I will give them a bit of a tart up to get rid of some of the bumps and lumps and evidence of rust and paint runs from the original steel doors. I'll also tidy up the area where the door latch goes so it's more suitable for the Mk1 latches.
Next job though is to trim and then match them to the door skins.
the TR 4 pot engines started life with TDC drilling (early TR2).
This gave possible oil starvation due to centrifugal forces. This was soon changed to a cross drill design.
This cured the oil starvation. BUT!!!! the TR 6 pot has TDC drillings in the Big-End journal.
I suspect the oil pump was the main issue all those years ago,
As for deep drilling etc - the workshops could do almost anything.
However one oddity - When they changed over to cross drilling they adapted the original oil gallery drilling which gave an awkward dog leg. The new TR 4 pot crank has a new drilling design which removes the dog leg
Cross drilled crank. Nice, but why?
(I'm looking for a debate here....!)
I think early production would use it because the accuracy of the long gun drilling would not necessarily be set up in a refined machining process. The cross drilling could allow some error (drill 2 ways: main into the big end journal 'well' and big end surface into the 'well'). I'm not sure it was done for performance reasons?
....but it does give some performance advantages. As I see it this would be nice perpendicular oil feed from a 'well' in the centre of the journal. Plus oil feed for the big end could be placed at the optimum radial position. Can't recall all the science here but you would feed the oil in just before the point of maximum pressure (a bit after TDC). Not sure that that is what has been done here?
Perhaps the main oil drillings are one long straight drilling all the way from main to big end which trashes my theory......
Any other thoughts?
It leaves you with a nightmare cleaning job though John!
Finally getting to the bed rock of clearing out my late fathers garage/workshop,store/den. Found things that haven’t seen daylight for at least 20 years and in some cases considerably more.
have found, and need to move onto a good home for a small consideration rather than sending to the scrap man!
1.Denford viceroy educator lathe model TDS 1
2. Pair of stainless wheel trims average condition
3.Spitfire alloy radio frame, plus knee pads
4. Spitfire 3,4, 1500 stainless tubular exhaust. Think it might be a Bell item
5. Inlet manifold think for later spitfires, usual problems with the water tubes
6. Herald/Vitesse LH boot extension
7. Pair of stainless mirror backs and replacement glass
I have more photos if required.