Office of Steam Logo_1

Author Topic: M90 Piston rings  (Read 542 times)

  • Jr. Member
  • **
  • Posts: 147
Re: M90 Piston rings
« on: February 06, 2020, 11:15:44 pm »
Just wondering,...the RC model airplane OS engine blogs all make a big deal about maintaning a properly Crosshatched, honed, roughed up cylinder wall for propper metal piston ring breakin & compression seal ....i noticed my new M90 series engine has a very smooth, hard, rubber o-ring compatible cylinder wall finish. After M90 metal ring conbersion, will the new ring breakin & seal properly to the smooth bore ?