SkyActiv engine harder on oil than ?? Please give references that show data because from the data I've seen the engine is quite easy on oil. Ed
Eddie said:Harder on oil than low-compression (average is 10:1 on cars these days) engines with port fuel injection. I'll get references.
Enh. That is only the static compression ratio, it's not like it runs combustion pressures equivalent to a cam-centered 13-14:1 all the time, the dynamic compression ratio is well within the normal range.
If they show high wear and oil breakdown then I'd say they're harder on oil, but I'm not seeing it despite dilution on new engine UOAs
They can only do so much late valve opening (emissions limited), if thats what you're referring to. Besides, the higher compression is how these Skyactiv engines get great fuel economy, so they must run high compression, the proof is right there. ...
Also read the "merits" section on this web page: http://www.mazda.com/mazdaspirit/skyactiv/engine/skyactiv-g.html