There is not a huge difference. It really depends on what measuring
equipment you have, the main bearing diameters are easy enough to measure,
but are not conclusive!
Dimensions in inches.
948 1098 (early) 1098 (late) 1275
Stroke 3 3.296 3.296 3.2
Main dia 1.75 1.75 2 2
All crank-pins are 1.625 dia.
1275 have six flywheel bolts and two dowels. 948's have four bolts, I think
1098's do too.
Neil
----- Original Message -----
From: <LenPicton@aol.com>
To: <british-cars@autox.team.net>
Sent: Friday, November 09, 2001 1:32 AM
Subject: Spriget cranks
> OK you BMC-A series experts! I have two cranks. I dismantled some cars
> about 10 years ago; 948s, 1098s and 1275s. I have two naked cranks on
> workbench from those days. How do I tell which engine displacement the
> cranks came from?
> Len
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