egt probe location

[David Hunt]

The gas loss from exhaust port to header flange is on the order of 100
degrees F.  The cooling is due to loss through the metal to the air AND gas
expansion.  Remember that after the header you can hold your hand in the
exhaust stream (though not too long and not at WOT.)  At the header such
things as road speed (and cooling air) greatly change the measurement.

BTW head cooling will greatly affect an external sensor too close to the
head.  Double edged sword,  lower measurement temps but lower change in
temp.

dh


----- Original Message -----
From: "Jeff Bromberger" <blownz at home.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, July 06, 2001 4:28 PM
Subject: egt probe location


> If i'm going to have only a single EGT probe on a V8 SBC could i still get
> usefull data by mounting it in one of the header collectors? my thought is
> that the temps would read lower than if it was mounted right by the head,
> but i would still see relative changes (added timing, temp went up, for
> example)... and i would also be able to keep tabs on at least half of the
> motor vs. only one cylinder... how much do you think the temps would drop
> from head to collector on long tube headers?
>
> thanks,
> jeff
>
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