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  1. Focus RS Performance
    Starting the journey from scratch! I bought a brand new Ford Fusion 2.0 EcoBoost cylinder block. There are a few differences from the RS block and also from the ST block. First, the deck. As seen below it’s a different casting and it’s no longer fully open, but still more open than the ST...
  2. Focus RS Performance
    If you build your own engine, it’s a good idea to spend some time making all pistons weight the same. There are plenty of videos on YouTube showing how to do that in the worst possible way: they all show how to use a burr to grind the pistons in various ways to remove material. The last thing...
  3. Focus RS Performance
    ARP makes the following bolts for our engines: Main bolts (151-5407) Crankshaft pulley (251-2501) Flywheel (251-2802) Cam sprockets (151-1001) Head studs (625+ sold by SP63, or the standard ARP2000 151-4301) All ARP bolts and studs are reusable “indefinitely” provided you never over-tighten...
  4. Focus RS Performance
    This is my second home-made ported head, still learning as I go. The first runs great: the engine has incredible mid-range and the head porting + Ford Performance cams certainly helped. For this second version I went a little further: more porting, in particular on the exhaust side, a bit of...
  5. Focus RS Performance
    I just received my new rods 😋 These are made by Carrillo, a big name in motorsport. I took their standard (3/8 WMC H6) bolts, which are good to 8’000rpm on our engines I was told. They also offer higher grade bolts for higher speed engines, but the cost is not justified on a (relatively)...
  6. Focus RS Performance
    When doing a rebuild it is important to ensure flatness of both the deck and the head. It is also important to maintain the chamber volume as this greatly affects the compression ratio and the octane demand of the engine, and thus it’s propension to knock. Don’t settle for gasket X just because...
  7. 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...
  8. Focus RS Maintenance
    New Ford block, Mahle Motorsport 2618 forged pistons, Supertech 4340 forged rods, lightened crankshaft, new oil pump, and new ARP studs and bolts all around. Ceramic coating experiment on pistons and of course my DIY ported head and its Ford Performance camshafts. I set the ring’s end gap to...
  9. Focus RS Maintenance
    Short video: DYI Injector Cleaning I bought a 120W ultrasonic cleaner (size of a toaster) and just dipped the injectors for a couple of hours in soapy water with the heater and ultrasound on. They came out as good as new as far as appearance.
  10. Focus RS Performance
    I decided to go one step further and do some light porting work to complement the Ford Performance camshafts. No idea how effective but I kept the stock spirit and tried not to lose too much velocity on the inlet, after seeing flowbench results of CNC “dimpled” EB2.3L heads with maxed out...
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