8 replies to this topic

[Matt23]

Hi All,

 

I have a 1980 Clubman Estate brought as an unfinished project with little info. I recently had cause to remove the head and noticed some nukbers on the pistons that I can't identify.

All the pistons have ID19 +1 0.16 S38

I can't find any info on that number, I'm assuming they arent original but would like to know if the engine has been bored.

 

Many Thanks

 

[DeadSquare]

If it still has the engine nukber riveted to the block, it is unlikely to have been rebored.

[Spider]

It looks to me like it's been bored + 0.040" over.

[Matt23]

If it still has the engine nukber riveted to the block, it is unlikely to have been rebored.

The rvited plate has been removed, when I brought the car there were pictures of a restoration and one of those shows the engine with no head fitted

[Matt23]

It looks to me like it's been bored + 0.040" over.

What makes you conclude that ? I've searched and searched but can't find a refernce. I'm just curious, I suspected it would have been rebored but the cars history is a bit of a mystery.

[timmy850]

40 thou is 1.016mm 

 

+1.016 probably means 40 thou over like Spider suggests

[Spider]

 

It looks to me like it's been bored + 0.040" over.

What makes you conclude that ? I've searched and searched but can't find a refernce. I'm just curious, I suspected it would have been rebored but the cars history is a bit of a mystery.

 

 

This;-

 

40 thou is 1.016mm 

 

+1.016 probably means 40 thou over like Spider suggests

[Matt23]

 

 

It looks to me like it's been bored + 0.040" over.

What makes you conclude that ? I've searched and searched but can't find a refernce. I'm just curious, I suspected it would have been rebored but the cars history is a bit of a mystery.

 

 

This;-

 

40 thou is 1.016mm 

 

+1.016 probably means 40 thou over like Spider suggests

 

 

Hey, thansk so much for the info, I do like to understand such things ! 

Car is full of mystery, I've just been replacing the headgasket and found that when the top end was assembled there was engine paint all over the block's mating surface, Getting pain all over that area in te fist place is odd enough but then not cleanig it off befoe putting thr gasket and the head on is truley stange.

Ohh and the engine number on the log book is 994791PZ - I have had to conclude that this should be 99H...maybe BL could afford a decent biro ?

[DeadSquare]

40 thou is 1.016mm 

 

+10.16 probably means 40 thou over like Spider suggests

To quote another post on here.  "Minis Are Not Metric".

 

This is a classic example of the inexactitude of the metric system.

 

What do you do with the ruddy DOT ?

Edited by DeadSquare, 22 June 2025 - 10:34 AM.