Exhaust - Revision history

SpookySimon: moving discussion to discussion page

2022-04-06T18:27:20Z

moving discussion to discussion page

SpookySimon: fleshing out outline

2022-04-01T17:50:35Z

fleshing out outline

SpookySimon at 17:32, 31 March 2022

2022-03-31T17:32:08Z

SpookySimon: /* Runner Lengths */

2022-03-31T16:23:38Z

Runner Lengths

RealHumanBean at 05:15, 13 June 2020

2020-06-13T05:15:50Z

RealHumanBean: /* Runner Lengths */

2020-06-09T01:52:30Z

Runner Lengths

RealHumanBean: /* Exhaust Form Factors */

2020-06-09T01:50:19Z

Exhaust Form Factors

AlexandrePiccini: /* Sound */

2020-05-21T00:59:08Z

Sound

SpookySimon: header clocking reminder

2020-05-18T02:39:04Z

header clocking reminder

Toaster at 16:10, 16 May 2020

2020-05-16T16:10:11Z

@@ Line 1: / Line 1: @@
-The '''exhaust''' system is designed to aid in the removal of burnt fuel and air from the engine. A sound limit is placed on the exhaust in competition.<br />we should also talk about header clocking by firing order into the collector - for scavenging goodness. Scavenging matters because ideally we would have a reversible and adiabatic expansion of the exhaust gases in the cylinder from the maximum cycle pressure to the ambient atmospheric pressure during the power stroke. If the gas is leaving the cylinder at some elevated pressure because of the pressure drop throughout the exhaust system, the potential expansion work relative to the ambient pressure is wasted and the engine power is reduced.
+The '''exhaust''' system is designed to aid in the removal of burnt fuel and air from the engine. A sound limit is placed on the exhaust in competition.
 [[File:Exhaust diagram.PNG|thumb|Exhaust System]]<br />
-==Exhaust Form Factors==
+=Exhaust Form Factors=
 The exhaust form factor should drop out of your design constraints (e.g. packaging and weight) as well as your engine system model. There is no one right answer for the best exhaust system.[[File:Exhaust mounting diagram.PNG|thumb|Exhaust Mounting]]
-===4-1===
+==4-1==
 '''Pros'''
 * Simplicity
@@ Line 11: / Line 10: @@
 * 4 to 1 collector can be hard to source, or manufacture depending on your team's resources,
 * Can only tune to one frequency
-===4-2-1===
+==4-2-1==
 '''Pros'''
 * can tune for two resonant frequencies
 * more flexibility with packaging
-===4-2===
+==4-2==
 I know it's been done by at least one team but for the life of me I can't find them
-===4-4===
+==4-4==
 (never seen 4-4 but it'd be sweet. A drawback would be having to include 4 mufflers).
 {{clear}}
-==Silencers and Noise test==
+=Silencers and Noise test=
-===Muffler/Silencer===
+==Muffler/Silencer==
 A muffler (or silencer) is an acoustical filter designed to ensure appropriate noise control in the exhaust system of an internal combustion engine.
-==Manufacturing==
+=Manufacturing=
 A key quality control during manufacturing should be maintaining equal runner lengths for each stage of the exhaust and minimizing flowpath disruptions due to weld beads or tube misalignment.
-==Tuning==
+=Tuning=
-===Runner Lengths===
+==Runner Lengths==
 Because of the high temperatures and pressures involved, reduced order models such as Helmholtz (a linear acoustic model) start to break down. A parametric study in WAVE or GT-Power is more useful to determine realistic runner lengths.
 [[File:CooperExhaustRunnerLengthSim.png|thumb|left|Example of the Effect of Different Runner Lengths]]
 {{clear}}
-===Helmholtz===
+==Helmholtz==
 [[Category: Internal Combustion]]

@@ Line 5: / Line 5: @@
 The exhaust form factor should drop out of your design constraints (e.g. packaging and weight) as well as your engine system model. There is no one right answer for the best exhaust system.[[File:Exhaust mounting diagram.PNG|thumb|Exhaust Mounting]]
 ===4-1===
 ===4-2-1===
 ===4-2===
 ===4-4===
 (never seen 4-4 but it'd be sweet. A drawback would be having to include 4 mufflers).

@@ Line 4: / Line 4: @@
 ==Exhaust Form Factors==
 The exhaust form factor should drop out of your design constraints (e.g. packaging and weight) as well as your engine system model. There is no one right answer for the best exhaust system.[[File:Exhaust mounting diagram.PNG|thumb|Exhaust Mounting]]
-===4-1 <br />===
+===4-1===
-===4-2-1 ===
+===4-2-1===
 ===4-2===
 ===4-4===
 (never seen 4-4 but it'd be sweet. A drawback would be having to include 4 mufflers).
 ==Silencers and Noise test==
 ===Muffler/Silencer===
 A muffler (or silencer) is an acoustical filter designed to ensure appropriate noise control in the exhaust system of an internal combustion engine.
 ==Tuning==
 ===Runner Lengths===
-Just do a parametric study in WAVE or GT-Power to determine runner lengths. Because of the high temperatures and pressures involved, reduced order models such as Helmholtz (a linear acoustic model) start to break down. A key quality control during manufacturing should be maintaining equal runner lengths for each stage of the exhaust and minimizing flowpath disruptions due to weld beads or tube misalignment.
+Because of the high temperatures and pressures involved, reduced order models such as Helmholtz (a linear acoustic model) start to break down. A parametric study in WAVE or GT-Power is more useful to determine realistic runner lengths.
-[[File:CooperExhaustRunnerLengthSim.png|thumb|left|middle|Example of the Effect of Different Runner Lengths]]
+[[File:CooperExhaustRunnerLengthSim.png|thumb|left|Example of the Effect of Different Runner Lengths]]
+{{clear}}
 ===Helmholtz===
 [[Category: Internal Combustion]]

@@ Line 15: / Line 15: @@
 ===Runner Lengths===
 Just do a parametric study in WAVE or GT-Power to determine runner lengths. Because of the high temperatures and pressures involved, reduced order models such as Helmholtz (a linear acoustic model) start to break down. A key quality control during manufacturing should be maintaining equal runner lengths for each stage of the exhaust and minimizing flowpath disruptions due to weld beads or tube misalignment.
 ===Helmholtz===
 [[Category: Internal Combustion]]

@@ Line 1: / Line 1: @@
-The '''exhaust''' system is designed to aid in the removal of burnt fuel and air from the engine. A sound limit is placed on the exhaust in competition.<br />
+The '''exhaust''' system is designed to aid in the removal of burnt fuel and air from the engine. A sound limit is placed on the exhaust in competition.<br />we should also talk about header clocking by firing order into the collector - for scavenging goodness. Scavenging matters because ideally we would have a reversible and adiabatic expansion of the exhaust gases in the cylinder from the maximum cycle pressure to the ambient atmospheric pressure during the power stroke. If the gas is leaving the cylinder at some elevated pressure because of the pressure drop throughout the exhaust system, the potential expansion work relative to the ambient pressure is wasted and the engine power is reduced.
 [[File:Exhaust diagram.PNG|thumb|Exhaust System]]<br />
 ==Exhaust Form Factors==
 The exhaust form factor should drop out of your design constraints (e.g. packaging and weight) as well as your engine system model. There is no one right answer for the best exhaust system.[[File:Exhaust mounting diagram.PNG|thumb|Exhaust Mounting]]
 ===4-1 <br />===
-===4-2-1===
+===4-2-1 ===
 ===4-2===
 ===4-4===
 (never seen 4-4 but it'd be sweet. A drawback would be having to include 4 mufflers).
 ==Silencers and Noise test==
 ===Muffler/Silencer===
 A muffler (or silencer) is an acoustical filter designed to ensure appropriate noise control in the exhaust system of an internal combustion engine.
 ==Tuning==
 ===Runner Lengths===
 Just do a parametric study in WAVE or GT-Power to determine runner lengths. Because of the high temperatures and pressures involved, reduced order models such as Helmholtz (a linear acoustic model) start to break down. A key quality control during manufacturing should be maintaining equal runner lengths for each stage of the exhaust and minimizing flowpath disruptions due to weld beads or tube misalignment.
 ===Helmholtz===
 [[Category: Internal Combustion]]

← Older revision		Revision as of 16:10, 16 May 2020
Line 1:		Line 1:
−	~~[[File:Exhaust diagram~~.~~PNG\|right\|middle\|thumb\|Exhaust System]][[File:Exhaust mounting diagram~~.~~PNG\|right\|middle\|thumb\|Exhaust Mounting]]~~	+	The '''exhaust''' system is designed to aid in the removal of burnt fuel and air from the engine. A sound limit is placed on the exhaust in competition.

		+	[[File:Exhaust diagram.PNG\|thumb\|Exhaust System]]
		+	backpressure is a meme
		+	==Exhaust Form Factors==
		+	[[File:Exhaust mounting diagram.PNG\|thumb\|Exhaust Mounting]]
		+	===4-1===
		+	===4-2-1===
		+	===4-2===
		+	===4-4===
		+	(never seen 4-4 but it'd be sweet

		+
		+	==Sound==
		+	===Muffler===
		+	===Interference===
		+	==Tuning==
		+	===Runner Lengths===
		+	===Helmholtz===
	[[Category: Internal Combustion]]		[[Category: Internal Combustion]]
−
−
−	~~backpressure is a meme~~
−	* exhaust form factors:
−	** 4-1, 4-2-1, 4-2, 4-4 (never seen 4-4 but it'd be sweet)
−	* sound limit
−	** muffler
−	** interference
−	* tuning
−	** runner lengths
−	** helmholtz