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Don't throw that old block away just because you think the bore is no longer usable. By installing a sleeve into the block you can renew the bore and take it back to standard size. Even the factory supplied blocks as new with this type sleeve. Should be installed by your local machine shop. Fits any 1275cc engine.

Wall thickness of the liner is 2.49mm.

Cylinder Sleeve / Liner 1275 , Sprite , Mg Midget , Mini

Cylinder Sleeve / Liner 1275 , Sprite , Mg Midget , Mini

Cylinder Sleeve / Liner 1275 , Sprite , Mg Midget , Mini
Part No: SU3875
CLEARANCE Price $44.98
Qty:
List: $85.95 You save: $40.97
Discounts Do Not Apply
Fits the following:
Classic Mini
Sprite & MG Midget
Morris Minor
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Don't throw that old block away just because you think the bore is no longer usable. By installing a sleeve into the block you can renew the bore and take it back to standard size. Even the factory supplied blocks as new with this type sleeve. Should be installed by your local machine shop. Fits any 1275cc engine.

Wall thickness of the liner is 2.49mm.

 
 
Question:
To install this in a 1275 A+ block we'd need to bore the cylinders out by 2.49mm? Then install the sleeve bringing it back to 1275cc?
Answer:
Sounds correct to me. After that you'll still need to bore to the piston size, however.

Any machine shop doing this work will know what to do - it's a very common thing for them. You could use the pistons you have with new rings, however, with the cost of fitting the sleeves you may want to go with new pistons and rings instead of just rings and the reason for this is because the sleeves cannot be fitted with the standard pistons after fitting. They will still need to bored to standard size (or any other size like +.020", +.040", etc.) so the machine will need your pistons and rings so they can set the correct bore.

I usually recommend fitting new pistons and rings any time re-boring is done and especially in this case where you're paying for sleeving, too.

the engine will be better off with new pistons and rings if you're going to the trouble of resleeving. Otherwise, I would find another block that doesn't require boring but just honing and then you could use the pistons you have with new rings. But finding a standard block that doesn't require boring over would be a trick!

Those pistons would be fine, or the higher compression types for a little more oomph:

https://www.minimania.com/part/21253-STD-EA/Classic-Austin-Mini-Cooper-1275-Pistons-Std-975-Compression-Sold-Each


Mini Mania Tech Team

The Classic Mini Parts and Accessories Experts

 
 
 
 
Question:
What is the o.d. of the sleeve? We have a 1380cc racing engine with some apparent cylinder wall damage. Can we employ this sleeve?
Answer:
the OD of this sleeve is 2.88" they are 2.5mm thick - This would not work for a 1380

Mini Mania Tech Team

The Classic Mini Parts and Accessories Experts

 
 
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