Searching a naturally aspirated engine

• gasoline direct injection (GDI), also known as petrol direct injection, direct petrol injection, spark-ignited direct injection (SIDI) and fuel-stratified injection (FSI).
• variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions.
  • can be used with both direct and indirect injection
• best would be to find a indirect injection engine, like on Mazda 6 GH 2.0 pre-facelift (2008-2010) and all Mazda 6 GH 1.8 (2008-2012).
• VTi (Valve Timing injection) engines created by PSA Peugeot Citroën and BMW Group uses indirect injection
  • there are 2 variants, 1.4 with 95 bhp and 1.6 with 115bhp
• MIVEC is the brand name of a variable valve timing (VVT) engine technology developed by Mitsubishi Motors
• Honda VTEC ..
• Ford TI-VCT, non GDI
• PM (particulate matter) is produced only by engines with direct injection
• EURO 6
  • it is achived basically only with direct injection with very few exceptions
  • Toyota has some small 1.33 MPI EURO 6 engines
• EURO 5
  • most engines are designed with direct injection,
  • few exceptions for >1.6, like Mazda MZR 1.8i
  • easier to find for small engines, <1.4
• EURO 4
  • many engines can be found with indirect injection
  • but many use with direct injection, think about VW/Audi FSI