On 5 Apr, 19:08, "R.N. Robinson"
wrote:
"dave sanderson" wrote in message

oups.com...



A few dimensions might help.

Overall length for a start, and some idea of the stroke, which you should
be
able to give us without unwrapping it too much.

Ron Robinson

Was just in the garage doing that...
All measurements with a ruler, so reasonably accurate, but not
precise.
Cranks is ~17" oa length. stroke is ~3.5", give or take a smidge.
Mains are ~1.75" dia, 1 3/32 wide. big ends are ~1.5"
The cylinders are on centers of: 1 and 2 ~2 9/16" 2 and 3 ~3 and 9/16
and 3 and 4 ~2 9/16" the extra inch is in the center main, not thicker
webs.
The center web has no extra past the main bearing,neither do the mains
at the ends. Ive not seen a crank like that before, usually there is
some balancing web. In Vizards TBASE the photo of the A30 crank (pg
359 in the second edition) looks similar, but the webs between 1 and 2
and 3 and 4 are to thick, and there are balancing weights, whih are
not present on the mystery item. This itself suggests to me it is a
crank for an earlier engine?

The stroke is about right for a late 1940's A40 (Devon, Dorset) but I would
expect those to have had counterweights. The lack of them would indicate
something earlier and Austin before the war did the whole range from 8hp up.
I don't know the bores and strokes of these, but I'm guessing Austin 8 or
10hp. The 12hp was 69mm bore x 100mm stroke or thereabouts so it would have
to be smaller than that.

Ron Robinson

Been mulling this over, so tonight I had another look at the tag on
the crankshaft. I think that the number I though was a five might
actually be an eight, especially after comparing with some of my late
grandfathers writing. New question now, does anyone have a pictute of
an Austin Eight crankshaft? older cars used to have parts booklets,
with line drawings showing all the bits, even this would help. Or
specs of the engine, the usually helpful internet seems not to have
much on these earlier austins (what did we do before all the
information was available instantly?)

thanks all

Dave

Dave