[s-cars] NAC Mazda SKYACTIV

[Stephen Redford]

----- When I asked that question , some time ago,  I was told the ecu just retards the spark.   I have to think there is more to it than that.  When I asked that question, Direct Injection was not on regular production cars .   So mixture and timing are the ECU 's main inputs, maybe the direct injection makes a huge difference somehow.   Interesting Question.



On Apr 26, 2012, at 8:08 AM, Taka Mizutani wrote:

> Direct injection, long stroke and combustion chamber design.
> 
> Cadillac is doing around 12:1 with direct injection and regular unleaded
> and Hyundai is running a pretty high compression ratio with
> their GDI turbo engine and it runs on regular as well.
> 
> Taka
> 
> 
> On Wed, Apr 25, 2012 at 11:52 PM, Varon H. Fugman
> <vfugman at globaldialog.com>wrote:
> 
>> 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?
>> 
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Stephen R.
shr42 at msn.com