[s-cars] NAC Mazda SKYACTIV

[Hap Maguire]

Hey Teddy

I think that's Miller time.

Hap, wit dakine timing not from Evahboost, Maguire 

Sent from my iPad

On Apr 27, 2012, at 1:17 AM, tedebearp at yahoo.com wrote:

> Also variable valve timing that switches it to Miller cycle under some conditions. 
> 
> Sent from my iPad
> 
> 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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