[Fot] EGT's again... the averages

[Tony Drews]

14.7:1 is for unleaded gas / cat converter.  The EPA redefined it for us.

Tony

At 01:15 PM 5/23/2013, Barr, Scott wrote:
>Tony wrote:  << a bit richer than stoichiometric, ie 13:1. >>
>
>And I said "...wait, what?".   13:1?   I have always heard that 
>gasoline fuel stoich point was 14.7.  A little research says Tony's 
>right as usual.  I've been reading my A/F meter at 14.5 or so and 
>thinking that was a good thing.
>
>Time to turn the adjusting nuts out a few flats and take a look at 
>the plugs...
>
>
>
>-----Original Message-----
>From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] 
>On Behalf Of Tony Drews
>Sent: Thursday, May 23, 2013 10:58 AM
>To: Bill Tobin
>Cc: fot
>Subject: Re: [Fot] EGT's again... the averages
>
>I made best power when the car ran slightly "rich", a bit richer 
>than stoichiometric ie 13:1. I ended up with best power closer to 
>12.5:1.  So, some of the high EGT is due to fuel still burning when 
>the exhaust port opens.
>
>The A/F meter was at the dyno, I don't have one in my car.  The 
>leaded gas kills the A/F pickup.  I bought a new one for the dyno 
>session and we killed it by the end of the testing.
>
>Tony Drews
>
>At 10:38 AM 5/23/2013, Bill Tobin wrote:
> >Tony, what kind of A/F ratio setup do you use? And what ratio do you
> >shoot for?
> >Thanks, Bill
> >----- Original Message ----- From: "Tony Drews" <tony at tonydrews.com>
> >To: <toodamnfunky at comcast.net>; "Scott Janzen" <sjanzen at me.com>
> >Cc: "fot" <fot at autox.team.net>
> >Sent: Thursday, May 23, 2013 10:30 AM
> >Subject: Re: [Fot] EGT's again... the averages
> >
> >
> >>By the way, my carb jetting was determined on an engine Dyno, and
> >>included the use of an air/fuel ratio gauge.  So, I just noted the
> >>EGT's produced at that time as "baseline".
> >>
> >>Tony Drews
> >>
> >>At 09:19 AM 5/23/2013, toodamnfunky at comcast.net wrote:
> >>>Thanks guys for the input.
> >>>
> >>>We see probes mounted anywhere from 1.75 " to 6" from the flange
> >>>
> >>>and EGT's from 1300 to 1400. So it's an average of 3.9" from the
> >>>flange and 1362F for EGT's.
> >>>
> >>>Very helpful,
> >>>
> >>>Jim G.
> >>>
> >>>
> >>>
> >>>----- Original Message -----
> >>>
> >>>
> >>>From: "Scott Janzen" <sjanzen at me.com>
> >>>To: "fot" <fot at autox.team.net>
> >>>Sent: Thursday, May 23, 2013 6:42:37 AM
> >>>Subject: Re: [Fot] EGT's again
> >>>
> >>>2" from the head. B  1300 degrees on the GT6 at 7000 RPM, 32 degrees
> >>>advance.
> >>>Tailpipe is tan/grey, leaded 110, forged Venolia pistons, 12:1
> >>>compression I suspect I could lean it out a bit - need some dyne time
> >>>with the webers to determine.
> >>_______________________________________________
> >>fot at autox.team.net
> >>
> >>http://www.fot-racing.com
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