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Old 11-27-2002, 06:52 AM
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Post exhaust temp's

Help! I am trying to get some technically specific information about the exhaust system temperature of a Ford F-150. What is the temperature of the metal pipes/parts in the varying zones of a Ford truck exhaust when the engine has been running awhile at 10-20 and at 'normal' temp. on the dashboard gauge? Specifically, I am interested in the pipes, the catalytic converter, the muffler, and the tailpipe. My 6th grade son is doing a project for school and needs an answer to this question as well as a reference. Thanks!!!

[ November 27, 2002: Message edited by: starz ]

[ December 02, 2002: Message edited by: starz ]

[ December 02, 2002: Message edited by: starz ]</p>

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Old 11-27-2002, 06:57 AM
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Under load or idling? RPM? Too many varialbes to answer this question accurately.
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Old 11-27-2002, 10:01 AM
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As 4-jaw says, it is quite variable. Here are test results for a 1997 Mitsubishi Eclipse Spyder GST with a 2.0L DOHC and a turbo;

Actual Test Results (run 10-02-00)

Elevation: 600 ft above sea level
Barometric Pressure: 29.05 uncorrected weather station reading
Air Temperature: 35F
Vehicle Weight: 3500 lbs with a full tank of 93 octane Shell gas

Cold start @ 1200 RPM, 5-600F, 20" of vacuum

Warming up@ 900 RPM, 7-800F, 20" of vacuum

Normal Temp@idle-750 RPM, 8-900F, 18" of vacuum

City @ 3000 RPM 3rd, 1100F, 14" of vacuum

Highway @ 3000 RPM 5th, 1400, 10" of vacuum

Coasting, 850F, 24" of vacuum

WOT, 3000 to 7000 RPM, 1550F, 12 lbs. of boost

Exhaust temperature drops 200 F as it exits one inch away from the exhaust valve seat in this aluminum head. That information was ascertained during an extensive Winston Cup engine development program. This heat goes right into the exhaust port, head casting and finally migrates to the engine coolant. Tests showed that the exhaust valve reaches a minimum of 1,750 F.

[ November 27, 2002: Message edited by: willys36@aol.com ]</p>
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Old 11-27-2002, 10:51 AM
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It is also important to note that the f-150 will not reach the same egt as the car above at wot. Most aluminum pistons will not stand for anything over 1500 for more than a second unless they are coated. Egt should therfore not run over 1500. 1750 is just too hot for anything but a engine designed to do it. Most will burn the pistons at 1750.

If you need a reference I would do a search on yahoo or another engine for Turbocharger EGT(or Exhaust Gas temperature) There has been alot of research on the subject because it is so vital to a turbocharged engine.

chris

[ November 27, 2002: Message edited by: TurboS10 ]</p>
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