Anytime it's more than zero. Folks doing production work target touching at worst tolerance, 3 sigma, etc. You want them as close to zero as possible at max ring temp. If you go too far you will see ring butting which will show up as a ring scuff where the bore is scuffed where the rings butted and put load into the bore due to gaps being too tight. Make sense?
Quote:
Originally Posted by p4msi1
At what point does ring end gap affect blowby?
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