[Diy_efi] Exhaust gas temp

[gary]

I posted this with the hope/intent on getting a comment primarily
from  B.T. Corneto.
TIA.
>
> - Normally aspirated engine @ 8.5:1 CR - 1050 - 1250? F *
> - Normally aspirated engine @ 11.5:1 CR - 1150 - 1550? F *
>
In lite of posting the exhaust temps noted above, do you then
disagree with the statement noted below, from the link included?
http://www.sdsefi.com/techegt.htm

This from within the paragraph....
"Raising the compression ratio with no other changes will drop the
EGT at the same AFR."

BTW, for others interested, the above link agrees with some findings
that were noted earlier, from the elaborate scientific GAMI testing.
>
> ....special thanks to Smokey Yunik for telling me about this back in 1979.

A few authors of article thot those holes were for the purpose of
viewing the exhaust flame color.   :D

GAS

----- Original Message ----- 
From: "sc7500" <sc7500 at sonic.net>
To: <diy_efi at diy-efi.org>
Sent: Friday, April 01, 2005 12:38 AM
Subject: Re: [Diy_efi] Exhaust gas temp
>
> Regarding the heat of EGTs; having spent the better part of 11 years as
> a leading developer of ceramic metallic coating materials for industry,
> I have binders full of data on this subject.  45 years in professional
> drag racing taught me a few things too. Here - I'll share.
>
> Here's how a "standard" EGT - to - application chart could read for IC
> engines with a  "standard" tuning job:
>
> - Normally aspirated engine @ 8.5:1 CR - 1050 - 1250? F *
> - Normally aspirated engine @ 11.5:1 CR - 1150 - 1550? F *
> - Supercharged engine @ 8.5:1 CR, boost @ 6 PSI - 1250-1650? F *#
> - Turbocharged engine @ 8.5:1 CR, boost @ 6 PSI - 1250-1650? F *#
>
> * All info is for WOT or heavy loading w/ gasoline as fuel - see below
>      # Doesn't seem to matter what kind of boost it is
>
> ..... Not that bad, really - if small holes are drilled into the headers
to
> provide an auxiliary post combustion air source, a secondary ignition
> can occur down pipe which helps complete the burn cycle and evacuate
> the exhaust port.....  special thanks to Smokey Yunik for telling me about
> this back in 1979.
>
> Hope this helps. If nothing else, it may create a good base for
discussion!
>
> B.T. Corneto