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@autox.team.net [mailto:fot-bounces@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@tonydrews.com>
> >To: <toodamnfunky@comcast.net>; "Scott Janzen" <sjanzen@me.com>
> >Cc: "fot" <fot@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@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@me.com>
> >>>To: "fot" <fot@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@autox.team.net
> >>
> >>http://www.fot-racing.com
> >>
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