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Participant

Join Date: Jan 2007
Posts: 1

Muffler Pressure Question

01/19/2007 8:15 AM

i'm an engineering student and i'm designing a muffler (2-st. petrol engine)

which uses electrostatoc precipitation principle there by reducing the amount of

carbon coming out of the engine.my Q is what kind of materials shall we use to design

it for 200cc (withstanding back pr. etc)

what will be the pressure inside the muffler?

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Anonymous Poster
#1

Re: Muffler Pressure Question

01/20/2007 3:23 AM

Dear student,

The question is elusive. A muffler's purpose, by definition, it to reduce or alter sound coming out the [IC] engine. Does your project hope to dispense with the CATalytic converter(s)? When you say you intend to reduce "Carbon" coming out of the engine, does that mean you intend to feed Carbon back into the engine? If not, how would your "carbon muffler" reduce (i.e., capture and store) carbon coming out engine--to prevent its escape from the tail pipe? How would your design improve, if at all, on EGR at engine exhaust which also (already) would send "Carbon" back to the engine to keep it from "coming" out the engine through the CAT(s) and muffler? Perhaps you could approach your question from a broader, more systems oriented point of view? And from a more comprehensive chemical perspective than just "carbon"? Otherwise it seems too broad and ill-defined to narrow to any answer you seek. So, more specifics please.

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Guru

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#2
In reply to #1

Re: Muffler Pressure Question

01/20/2007 9:21 AM

Just a note . . . for 2 cycle engines the 'muffler' provides much more than silencing. The pressure pulses coming from the ngine are conditioned in acustic chambers to assit with scavenging.

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Guru
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#3

Re: Muffler Pressure Question

01/22/2007 10:18 AM

Electrostatic precipitation is a technique familiarly used in major power stations to substantially reduce particulates in the exhaust gases before they leave the chimney. By applying a high voltage across the flue gases the solids present are attracted to the one or the other electrode and leave the chimney otherwise than travelling up to the top.

All combustions of once-organic fossil fuels produce carbon oxides; the action of combustion is harnessed to produce power from the engine by increasing the number of molecules and their temperature exothermically. Under the temperatures and pressures of an engine exhaust these oxides are gases. It is currently difficult to see how an electrostatic precipitator would remove a gas from the exhaust stream. Could it be that a better way to reduce paticulates is to tune the petrol/air/oil ratio in this engine, so that any carbon comes out in its compounded form, i.e. as the monoxide or preferably the dioxide? Or has the question been misunderstood?

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Anonymous Poster
#4
In reply to #3

Re: Muffler Pressure Question

01/22/2007 10:31 AM

it is in the ice cream

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