Alpiners,
I went to go and clank some cranks last night.
I friend of mine brought along a 5 main, and a 3 main crank.
We clanked away!
The 5 main sounded better than the 3 main did.
The 3 main crank sounded dead in comparison.
We think the 3 main was cracked or something.
My 3 main at home sings like a harp.
I ran accross the following information, which appears to be a tad
more definitive than the old clank test.
In WSM 124 "Alpine Series 1 to 4 workshop manual"
On page 12, under the heading "Crankshaft, Balance"
The text reads "Integrally forged counterweights"
In WSM 145 "Alpine Series 5 workshop manual"
On page 17, under the heading "Crankshaft, Balance"
The text reads "Integrally cast counterweights"
On page 134 of the book "Sunbeam Alpine and Tiger, the
complete story" by Graham Robson, it is printed that the
SV crankshaft was "a spheroidal graphite iron cast crankshaft".
As for lifters with "convex" faces, the following is printed within
the Crower Camshaft and Lifter information book.
Qouted literally.
Where lobe meets lifter
The camshaft to lobe-to-lifter-face relationship is an interesting
subject. From all apearances, the cam lobes are straight across,
but actually, on all except a very few engines, cam lobes are tapered.
The lobe taper may be from .0007" to .002" across the face. The
lifter faces are also shaped different than they appear. The are
ground spherically with a .002" crown in the center. When the
camshaft is in place and the lifters installed, the lifters are offset
slightly from the cam lobes. The offset between the lobes and lifters
aid lifter rotation, and distributes valve spring loading over a wide
area
of the lobes.......SNIP.
Jarrid Gross
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