Re: Fuel Econ and Hiway Mode

[Len Sabatine <sabatine@epix.net>]

> The mechanism for Detonation  doesn't differ much in any era. P / VCMs 
> control it with
  knock sensors and proportioning EGR versus Throttle angle , 02 ,  MAP , 
ETC.
  Funny , Race Cars Don't have EGR , just 108 / 125  MON Fuel with LEAD .
  Oil in chamber or a sloppy tune up will torch a Race Engine real Quick. 
Try a Leanout
 on an Alcahol Burner and pump the pistons out the headers. Detonation at 
it's finest moment.
 In 35 Years of successful  Engine Building for Multi Enviornments, I 
don't belive I have It backwards.
 Some Engine Combinations are less prone to Detonation , all can be , with 
proper breathing and tuning.
 We're both arriving at the same place , expressed differently.    Let the 
60 s in the past where they are !!
 An Inert component added to the mixture is kin to adding octane by 
Slowing  combustion and Cooling the chamber.
  Better than Detonation and NOx , as I see it .
  Len


> << Part throttle
>  cruise
>     detonation and NO x ramp up substantially. Maybe,  GM didn't teach this
>  in school, >>
>
> Take out the associated ignition advance/fuel trim ALONG with disabling EGR
> and you have an engine out of a 60's car  that didnt HAVE EGR :-)
>
> Ever see a race car w/EGR? Why doesnt my TR ping w/EGR passage REMOVED? I'm
> talking on cruise/tip in.
>
> I think its a little bit backwards. The EGR's job, lowering the CC temps,
> INHIBITS ping by what introducing an inert mixture to the CC. The EGR isnt
> there to really COMBAT ping...thats what timing retard is for. Be it EST,
> Vacuum advance, whatever. Keep CC temps low enuf and you'll not form NOx, and
> you'll have less knock.
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jim  (FA) Testa                                             TType86 on
> #BuickGN
> ASE Master Technician                                buick.fiendish.net:6667
> L1 Advanced Engine Performance                    NJ Lic MV Inspector
> jtesta1966@aol.com                           NJ Lic Emission Repair Tech
> http://members.aol.com/jtesta1966/buick.htm
> Associate Sponsor, Buicks at Bristol (RCA/JTP)
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