[s-cars] NAC Mazda SKYACTIV

[Varon H. Fugman]

Does anybody have any idea how Mazda is able to run a 13:1 compression ratio
on their normally aspirated 2.0 liter SKYACTIV engine. on regular unleaded?
How are they avoiding knocking?

 

This engine is rated at 155hp and they claim 40mpg hwy in a SKYACTIV Mazda3
with 6-speed automatic.  

 

Varon

'95 urS6

'07 Jetta 2.0T (I think the "T" stands for "ticket"!)