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mystery engine nr

PostPosted: Mon Sep 21, 2015 6:28 pm
by minivo
hi guys,
i just bought a 1960 frog an it came with a 950, clearly cast into the blok.
but on the engine nr tag it says

889 R D25897, FD on the bottom
or 8G9 R D25897, FD on the bottom
see picture.
iff its a 950 than the prefix will be 99H etc. I can't find any documentation on it.
can any one tell me what it is or help id the blok?



Re: mystery engine nr

PostPosted: Fri Sep 25, 2015 12:43 am
by Charlie Tolman
A 950 cc Sprite / Midget engine should have a tag with 9C or 9CG.
The engine side covers look different from any 948 cc engine that I have seen.
I wonder if the engine is from a Morris Minor ?

Charlie T.

Re: mystery engine nr

PostPosted: Sat Sep 26, 2015 12:51 am
by Charlie Tolman
The 950 cast into the block identifies the engine as a 948 cc.

I found the following information on the Internet:


BMC, like many firms, did an exchange scheme for worn engines, one was the Gold Seal engine, a complete engine ready to fit and painted gold in colour. The other was the Silver Seal exchange engine, basically a short-block for the owner/garage to fit the old head,sump, and ancillories onto.

Both used a similar system of engine numbering, the original number being struck off.
Initially all engines in the scheme were prefixed 8G, soon a better system followed:

'A' series engines were prefixed 8G,- 803cc, 848cc, 948cc, 1098cc, 1275cc.
'B' series were prefixed 48G,- 1200cc, 1489cc, 1588cc, 1622cc, 1798cc.
'C' series were prefixed 68G,- 2639cc, 2912cc.

The code after was to do with rebore/regrind sizes and a job number.

If the number plate on your engine block starts with 8G, then it appears that the engine was an exchange engine from BMC, either the Gold Seal or the Silver Seal version.

The rivet holding the number plate on your block, seems to have a larger head than the usual rivets that I have seen. Does this mean that they are also a replacement ? Could be.

Charlie Tolman