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#1 gdcarpenter

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Posted 22 March 2020 - 03:02 AM

1990 Japanese Spec Mini Mayfair 1000 rhd: with a plaque indicating that is is an official "Anniversary Model" John Cooper Garages Conversion. Rover VIN # SAXXL2S1N20473934

Engine # 99HE22 113508, which, via 'Guess Works', comes up as an 'A' series 3.44:1 final drive.
(Per GPS and Tach I run 3,000 RPM at 50 MPH if that sounds right for the gearing.)
On the same machined surface of the block, just in front of where the engine number tag is, beneath the temperature sending unit, "H66" is hand stamped into the block, is this if any significance?

Cylinder head is a 'CAM 4810' with "COOPER" and the numbers "8169" hand stamped at the back of the head, not by the thermostat housing. Block casting is WFM 1026/4 N W, if that helps. Both block and cylinder head have identical faded and worn greenish/yellow paint remnants.

I personally feel sure that this is a genuine Cooper Conversion but the head paint does not differ from the block paint. Wondering if block work was ever part of a conversion, though I understand it was not, yet there is that hand stamped 'H66' on the block. Can anyone confirm whether this is an "A" block or an "A+" block.

I get 150 PSI accross the board on all four holes and may have some slight valve guide wear as there can be a brief shot of blue out the back at start up, but she runs fabulously and pulls great. Can anyone tell me what Pistons this block may have come with, dished or flat top?

Thanks, Garfield

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#2 cal844

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Posted 22 March 2020 - 10:50 AM

The A+ engine has a fork type clamp. If that engine number matches the v5C then it is a cooper engine. The block is definitely an A+ engine as it has strengthening ribs.

#3 gdcarpenter

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Posted 22 March 2020 - 12:30 PM

I forgot to mention that I am in North Carolina, USA. Mini was imported from Japan - so no v5C, and no engine # on registration here.
Dizzy is a 65D with the fork type clamp, so yes on the A+.

#4 cal844

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Posted 22 March 2020 - 04:11 PM

I forgot to mention that I am in North Carolina, USA. Mini was imported from Japan - so no v5C, and no engine # on registration here.
Dizzy is a 65D with the fork type clamp, so yes on the A+.

Ah I see, if you get a puff of blue smoke on start up, do a wet compression test to determine if it's a head rebuild due to valve stem wear or a block rebuild due to wear.

However It could just be valve stem seals but usually the valve guides are worn anyway

Edited by cal844, 22 March 2020 - 04:12 PM.





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