*** Exhaust tubing size ***
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Joined: Jan 2004
Posts: 34
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From: SoCal
The O.D. diameter of the tubing is actually in mm not in SAE inches. I wanna say its either 58 or 60mm. 2.500 O.D. tubing is close so you may need to have a muffler shop swedge the ends to get the correct fit.
Member
Joined: Jul 2004
Posts: 123
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From: Boston, MA
2001 BMW M5
The stock exhaust on the W211 E55 is almost 3' O.D. I beleive. Eisenmann offers their exhaust for it in 2.5' O.D. so you need a coupler to make them fit correctly. Supposidly, this icreases backpressure resulting in minimal rwhp gains. Hope this helps.
Thread Starter
Banned
Joined: May 2004
Posts: 3,797
Likes: 2
From: Richmond Hill, Ontario
2003 E55 AMG
Thanks Guys for the info!
I am working with a very big exhaust manufacturer/distributor to manufacture a full stainless steel system for the W211 E55 (to start with.. then make them for the other models). I am hoping to get a target retail price of $1,200 - $1,500 for the complete system from cat back.
I am just trying to get him the full specs on our cars so he can mock-up a system for me. We need bend lengths, muffler specs, etc...
I think I am going to have to put my car on a lift and just drop the exhaust to get all the measurements for him...
Stay tuned...
I am working with a very big exhaust manufacturer/distributor to manufacture a full stainless steel system for the W211 E55 (to start with.. then make them for the other models). I am hoping to get a target retail price of $1,200 - $1,500 for the complete system from cat back.
I am just trying to get him the full specs on our cars so he can mock-up a system for me. We need bend lengths, muffler specs, etc...
I think I am going to have to put my car on a lift and just drop the exhaust to get all the measurements for him...
Stay tuned...
Member
Joined: Feb 2003
Posts: 99
Likes: 0
Originally Posted by TCM
The stock exhaust on the W211 E55 is almost 3' O.D. I beleive. Eisenmann offers their exhaust for it in 2.5' O.D. so you need a coupler to make them fit correctly. Supposidly, this icreases backpressure resulting in minimal rwhp gains. Hope this helps.
While in some cases it is true that a larger diameter pipe will reduce low/mid rpm torque/power... it is NOT because of backpressure. Velocity is the key. Backpressure only helps in 2 stroke engines and that is with highly developed tuned expansion chambers and is not anything like a 4 strokes dynamics.
I cannot help with identifying pipe size but can say that German cars (as are Japanese cars) metric in dimensions. Manufacturers typically use smallish pipe sizes. On a 350hp engine my guess would be 60mm-75mm... 60 on the dual sections and 75mm on single pipe sections.
Standard metric pipes size and their standard conversions are as follows:
50mm = 1.97"
60mm = 2.36"
65mm = 2.56"
70mm = 2.76"
75mm = 2.95"
80mm = 3.15"
Standard sizes:
2.00" = 50.8mm
2.25" = 57.1mm
2.50" = 63.5mm
2.75" = 69.9mm
3.00" = 76.2mm
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MBWorld Fanatic!
Joined: Mar 2003
Posts: 2,974
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From: Southern California
2017 W205 C43 AMG
I recently changed my exhaust from stock to the AMG muffler.
The muffler piping was 2.75" and mated to the stock piping which was also 2.75".
Is it same to assume that for all the 430 cars (E430, CLK430, S430) that the tubing is 2.75" and on the AMG versions as well? The piping was larger than I expected, but a pleasant surprise.
The muffler piping was 2.75" and mated to the stock piping which was also 2.75".
Is it same to assume that for all the 430 cars (E430, CLK430, S430) that the tubing is 2.75" and on the AMG versions as well? The piping was larger than I expected, but a pleasant surprise.
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Joined: Sep 2004
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While for the most part JBrady is right, the size of the piping has a direct coorilation (sp) to the velocity of the exhaust gases. The exhaust gas is going to want to move the same speed no matter what pipe size it is, however the smaller pipes cannot move the exhaust as fast, thus what people call backpressure, can build. The effect should be refered to more correctly as exhaust scavenging. The minimal amount of pressure actually helps draw more air into the system thus creating more velocity at a lower RPM. Its somewhat confusing. Exhaust pipe diameter can make a difference in the car. As a standard, dual 2.5 can flow enough to sufficiently breathe a 600hp engine as can a single 3 inch.
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Joined: Feb 2003
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Originally Posted by Siggy_freud
While for the most part JBrady is right, the size of the piping has a direct coorilation (sp) to the velocity of the exhaust gases. The exhaust gas is going to want to move the same speed no matter what pipe size it is, however the smaller pipes cannot move the exhaust as fast, thus what people call backpressure, can build. The effect should be refered to more correctly as exhaust scavenging. The minimal amount of pressure actually helps draw more air into the system thus creating more velocity at a lower RPM. Its somewhat confusing. Exhaust pipe diameter can make a difference in the car. As a standard, dual 2.5 can flow enough to sufficiently breathe a 600hp engine as can a single 3 inch.
The effect of the interrelationship of pressure pulses (that start very high and quickly drop in pressure for each event) between cylinders is a dynamic one. Tight restrictive manifolds are OK during the high pressure times and at the same time restrict reverse flow back into the cylinder during the low pressure period of the exhaust event. When designing both manifolding and secondary piping it is important to maximize the flow energy available at each merge thereby facilitating both flow and velocity and reducing reversion and in optimized systems actually creating scavenging (the "vacuum" effect that actually creates a pressure drop that in some cases can be dramatic).
Senior Member
Joined: Sep 2004
Posts: 317
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From: NC
'07 Carrera S, '31 A 5W hot rod, 4Runner. Sold CLK55
Originally Posted by vrus
Thanks Guys for the info!
I am working with a very big exhaust manufacturer/distributor to manufacture a full stainless steel system for the W211 E55 (to start with.. then make them for the other models). I am hoping to get a target retail price of $1,200 - $1,500 for the complete system from cat back.
I am just trying to get him the full specs on our cars so he can mock-up a system for me. We need bend lengths, muffler specs, etc...
I think I am going to have to put my car on a lift and just drop the exhaust to get all the measurements for him...
Stay tuned...
I am working with a very big exhaust manufacturer/distributor to manufacture a full stainless steel system for the W211 E55 (to start with.. then make them for the other models). I am hoping to get a target retail price of $1,200 - $1,500 for the complete system from cat back.
I am just trying to get him the full specs on our cars so he can mock-up a system for me. We need bend lengths, muffler specs, etc...
I think I am going to have to put my car on a lift and just drop the exhaust to get all the measurements for him...
Stay tuned...
I want a full exhaust for my W208 CLK55, including headers!
