Leaky up pipes cause higher EGT??? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 05-12-2014, 09:42 PM Thread Starter
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Leaky up pipes cause higher EGT???

Ok so have seen on here a bit rescently that have leaky up pipes or a hole in them causing higher EGT's. My question is how does that work/make sence? Because in my mind its letting the hot air escape faster which is what you want so it should be making things cooler since the hot air is escaping faster in theory.

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post #2 of 11 Old 05-12-2014, 10:20 PM
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It Won't allow the turbo to spool up or it will cause it to spool slowly.

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post #3 of 11 Old 05-13-2014, 01:49 AM
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Turbo increases volumetric/pumping efficiency of of the motor. More air in and out if the motor means heat is carried away more effectivly. It self perpetuating (as long as stay within the design parameters of the pump/turbo) meaning that as it pumps more air and more fuel is supplied in the correct proportion/amount there is more kenitic energy created to drive the turbin wich drives the compressor thus increasing the amount of air available to fully combust the fuel available thus increasing the exhaust kenitic energy. Also, air density is closely related to the convective heat transfer. Turbo increases air density thus keeping engine cooler by increasing convective heat transfer. Not sure if this is a linear relationship. If you have an exhaust leak before the turbine the the kenitic energy is lost which means when you increase the fuel charge the air flow doesn't increase sufficiently to remove the heat fast enough to cool the engine. It's similar to the heating element in a blow dryer. If the airflow relative to the amount of heat being generated by the element drops then the element overheats and burns up. This is analogous to increasing the fuel delivery without increasing the amount of airflow in and out of engine. Heat generated by combustion energy stays in the combustion temperature and heats everything up and once the pistons are heat soaked they are prone to failure/breakage. Sorry if I confused you more with that crappy answer.

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post #4 of 11 Old 05-13-2014, 02:01 AM
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That post was self perpetuating

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post #5 of 11 Old 05-13-2014, 02:44 AM
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analogous =, or fancy for like.

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post #6 of 11 Old 05-13-2014, 07:18 AM
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Sorry, last part meant to read heat generated by the combustion process is not adequately removed from the combustion chamber thus heating up the piston, valves, etc more than is favorable.

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post #7 of 11 Old 05-13-2014, 08:24 AM
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^ what they said. the turbo cant work efficiently.

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post #8 of 11 Old 05-13-2014, 02:26 PM Thread Starter
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Ah ok makes scence to me now, thanks for the information. I guess you do learn something new everyday

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post #9 of 11 Old 05-13-2014, 03:00 PM
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Just think of motors as pumps. The turbo just compresses the inlet air so it is at a higher pressure than atmospheric pressure thus increasing the efficiency of the motors pumping action. I will try to pull up some charts of air pressure/density vs heat transfer of air with regards to convective cooling. This should illustrate why it is important to get enough air in and out of the engine. Exhaust scavenging should be important with regards to this. Not sure what kind of overlap a stock 7.3 cam has but this can have an effect on exhaust scavenging too thus decreasing temps. I love thinking about this stuff thanks for asking this question.

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post #10 of 11 Old 05-13-2014, 03:29 PM
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This is also dependent on other things too like boundary layer area% thickness, velocity, humidity, etc. I am oversimplifying it a bit but I will try to find something that replicates similar conditions that a combustion chamber will see.

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Last edited by ja_cain; 05-13-2014 at 03:34 PM.
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