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Honing Cylinder At Home?


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#1 Lenhamracer

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Posted 22 August 2026 - 04:29 PM

Dear Mini friends

 

I have a problem with my cooper s engine. I took the engine out to swap the diff for a quaife and thought it might be good to have a look into the cylinders as I noticed a drop in the compression.

There are an lot of scratches and there are not many honing traces left. Also I found a lot of hard baked carbon.

It is time for a rebore but I a in a historic regularity rally in two weeks. 

Do you think it is worth to rehone it with a drill and a honing adapter from amazon??

Unfortunately I don“t have enough time to rebore the engine and it ran like that at the last event and I thought a bit of honing is better than nothing...

 

Thank you and kind regards

 

Thomas

 



#2 Spider

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Posted 22 August 2026 - 06:07 PM

In short - no. I did a bit of a write up on this a while back;-

 

http://www.theminifo...gine-machining/

 



#3 Lenhamracer

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Posted 23 August 2026 - 07:40 AM

Thank you for your comment. I forgot to attach the picture..

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