Ford Focus RS Forum banner


  1. Focus RS Maintenance
    What follow is the summary of what I learned about piston ring’s operations and the role of their end-gap, while building my EcoBoost engine at home: One very important step while building an engine with aftermarket pistons is to set the piston ring’s end-gap. Most aftermarket pistons come...
  2. Focus RS Discussions
    Quick update on my RS' history: bought used @ 8K miles, already had the new HG installed Threw cyl 3 misfires about a few months in, had a cracked head, replaced under warranty. Threw Cat codes about a couple months later, had cat replaced. Drove great for about a year, then had this issue about...