[s-cars] NAC Mazda SKYACTIV

[tedebearp at yahoo.com]

Also variable valve timing that switches it to Miller cycle under some conditions. 

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On Apr 26, 2012, at 11:49 PM, Stephen Redford <shr42 at msn.com> wrote:

> 
> 
> 
> ----- 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
> 
> 
> 
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