04-29-2008, 05:39 PM
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Head Flunky
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Join Date: Sep 2007
Location: South Central Kansas
Posts: 1,547
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Turbo Timer/ EGT Response from Cummins
Quote:
Regarding your inquiry about EGT for Turbo Timer.
Thanks for your Email message. You have contacted Cummins, Inc. at our
Customer Assistance Center located in Columbus, Indiana. This is our
worldwide headquarters and has been our home since Clessie Cummins founded
the company February 3, 1919.
Cummins does not provide maximum or minimum EGTs for our engines.
The information is not very useful. The most expensive engines (V12 and
V18) engines tend to mask single cylinder high exhaust temperatures in the
average temperature as the exhaust gasses are mixed.
Dash mounted pyrometers are seldom accurate and lag the actual exhaust gas
temperatures by several seconds due to the durable shielding needed for the
fragile thermocouple they use.
In our research and development labs we measure the exhaust temps but do
this before the turbocharger, where the information is more meaningful,
using frequently calibrated pyrometers, in steady-state tests where the
time lag is unimportant.
It costs us considerable expense as the thermocouple shields often fail at
the higher temperatures we achieve during higher than 100% fueling tests
with higher than normal intake temperatures to accelerate power unit
failures. The failed shields then pas through the turbos causing expensive
damage.
Our experience is that use of pyrometers for field applications of engines
is most helpful when the instrument is used to watch for a change of EGT on
an engine when running at similar conditions (intake air temperature, load,
coolant temperature) experienced previously. This might help determine a
dead cylinder. In rare instances, an engine overheat can be detected using
a pyrometer but this would be more accurately reported by the coolant
temperature gage.
We thank you for your interest in Cummins products. We occasionally
misunderstand a question. If our answer to your communication looks like
we have misunderstood your e-mail please reply with further inquiry.
To locate the nearest Cummins-authorized Dealer or Distributor Service
Provider call our toll free customer assistance line 1-800-DIESELS
(343-7357) or for computer assistance in locating a Service Provider, use
Cummins Service Locator, which can be found on Cummins website:
Cummins Inc. Homepage
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So Cummins thinks an aftermarket turbo timer/thermocoupler is junk and that worrying about EGT at shutdown is unneeded? If so then why do the Dodge Chassis cab with the 6.7L have a Turbo Timer from the factory and how do you think they are getting the readings?
I'm going to have to work on a response asking just that. |
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