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997 cooper crank id ?

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A-7 850

Post subject: 997 cooper crank id ?

Posted: Mon Jan 12, 2009 9:56 am

848cc

Joined: Thu Jul 19, 2007 9:05 pm
Posts: 212
Location: CASTE HILL NSW

have a crank marked ..a298 on one end and on the other end just (4a) :o the stroke works out to be 3.2" small main brng size as per 998/1100. could this be a cooper 997 crank? machined down at the very end to take an early coil spring type flywheel being 1.3/8" taper ? :shock: yet the parralel size for the primery gear is the same as mini deluxe 998 .k 1100. 988 clubman :? has enyone seen this strange setup before ? some intrim idea from bmc to use up small taper flywheels i dunno ? :wink:

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wild_willy

Post subject:

Posted: Mon Jan 12, 2009 12:04 pm

998cc

Joined: Tue Sep 06, 2005 6:20 pm
Posts: 637
Location: Melbourne

12A298 is Cooper 997 crank with deva bush primary gear. 12A 375 is earlier 997 crank with oil feed bush.

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drmini in aust

Post subject:

Posted: Mon Jan 12, 2009 3:33 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39756
Location: near Baulkham Hills, NSW

I thought the 1-3/8 bore primary gear was only ever used on early 850...

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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