holidaychicken
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Yeo the filthy BMW M62TUB44 although I really like it , it does have it’s shortcomings. The early engines fitted into the bmw cars in the early 90’s were Nikasil coated bores. but the high sulphur fuel caused early failures so they changed to a very high silicon aluminium called Alusil that the whole block is made from. The bores are honed and then a chemical treatment applied that exposed the silicon to give a highly wear resistant surface although I think they stopped the chemical treatment and went to a felt pad and silicon paste process.
The Mahle pistons are ferro coated to stop pickup between the aluminium piston and bores- it’s along those lines anyway.
Apologies - you didn’t ask for the engines life story!
I only know this because I have one in my garage with 7 highly scored bores so that may get iron liners or made into a coffee table, and another engine in my RR.
This is the longest ‘thread’ in history to tap one hole!
The Mahle pistons are ferro coated to stop pickup between the aluminium piston and bores- it’s along those lines anyway.
Apologies - you didn’t ask for the engines life story!
I only know this because I have one in my garage with 7 highly scored bores so that may get iron liners or made into a coffee table, and another engine in my RR.
This is the longest ‘thread’ in history to tap one hole!