Fuel Econ and Hiway Mode

[Len Sabatine]

>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 at aol.com                           NJ Lic Emission Repair Tech
>http://members.aol.com/jtesta1966/buick.htm
>Associate Sponsor, Buicks at Bristol (RCA/JTP)
>----------------------------------------------------------------------------
>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org