Originally posted by Bishop
So then really your just fine grinding the pistons for a blue printed fit and finish?, with a polished final surface finish?
You previous description of lapping the pistons were of a honing method/motion, which is why I assumed you were after some sort of cross hatched fine finish on the pistons.
My mistake then I guess, I just assumed you were doing something more than just basic engine blueprinting, I'm sure the language barrier is not helping in that matter.
I wouldn't call it your mistake, it s my english issue and i am realy sorry for my english, I just learn it whatever I know in 10 years , without school.
On sleeve yes it is neccessary polishing surface, but piston never polish it, the surface from grinding is realy good. Lapping is for only repair tight fit ( when it comes from factories overtight).
I did many of factory made engines lapped and it is realy proven over the last 10 month, that life of P/S set 30-40 % longer, brak in period just one tank ( 30% open throtel reach), no conrod change after brak in etc.
So we can call lapping as correctin action, but not primary. If manufacturers will make fit right initialy, it will be totaly different pictures in power, life etc.