Terry , The early Mk1 crank with the 2 inch(?) bearings was definitely made
from tougher iron (more flexible???) I have read this somewhere... I think
they cheapened the material with the later 2000 because it was deemed less
prone to flex and the could get away with a more brittle iron.
Later in production I'm not sure what material they used but Spitfire Mk4
uses infinitely inferior iron compared to a early spit crank (Mk3 especially
which I believe uses the same material as the early six)
Chris Witor is the guru on these cranks and swears by the early six crank
but is not on the net
Any hints on building a big bore 2000 screamer as this is my next "project"
for a 1968 Mk1 I have just acquired.
I would also be very interested in those progressive rate rear springs.
Cheers Andy T
-----Original Message-----
From: Terry & Cindy O'Beirne [mailto:esp@hypermax.net.au]
Sent: Wednesday, 6 October 1999 18:42
To: 2000-Register@autox.team.net
Subject: heads & cranks
greetings all, some help please
firstly, I did not get any useful help with a request for a copy of the
recent Witor articles in Six Appeal re heads. Can anyone help me ?? I
have what seems to be part 2 (plus a later head flow graph to replace an
error in the article I have). If anyone has access top a fax or
photocopier I'll gladly pay for the costs involved.
next, early 2000 cranks. Does anyone know the material spec for the pre
& post 1967 cranks (when they changed bearing size). The earliest tech
info I have (Automobile Enginner, March 1964) says its EN16 material but
what about later (post 67) units???. Did the Mk2 unit change again???
Thanks, Terry O'Beirne, Australia
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