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Spaghetti · **1 Like**

Twisted exhaust headers on a stock car.

They do this so each tube is the same length. Tuned exhaust.

reh321 · 07-28-2018, 05:44 PM

What is the benefit of a "tuned exhaust" Looks like something that would be difficult to design.

**patrick9** · 07-28-2018, 05:48 PM - **1 Like**

Originally posted by reh321

What is the benefit of a "tuned exhaust" Looks like something that would be difficult to design.

As I recall it helps equalize the exhaust back pressure so as to even out the power of the engine

lesmore49 · 07-28-2018, 05:54 PM - **1 Like**

Bundle of snakes...as they used to say.

Racer X 69 · 07-28-2018, 07:02 PM

Originally posted by reh321

What is the benefit of a "tuned exhaust" Looks like something that would be difficult to design.

Equal length primaries in exhaust allows for equal exhaust flow for all cylinders. All systems have some backpressure, and a design like this keeps everything equal by reducing that backpressure and improving scavenging.

And yes, it is a difficult challenge. Racing, much like anything, presents challenges. Overcoming those challenges is how we succeed.

The intake is also tuned. Earlier I showed a photo of one of the engines that these headers would be attached to.

EJPearl · 07-28-2018, 07:17 PM - **1 Like**

Excellent weld joints. haha

lesmore49 · 07-28-2018, 07:25 PM - **1 Like**

I would think a number of tuned exhausts are custom made. Imagine the measuring, cutting, welding, fitting, etc. that takes place...lot of time. I have seen some of these header modeling kits...which help with layout, etc...before getting the metal tubing out and going to work on it.

http://https://www.trick-tools.com/Icengineworks-Exhaust-Header-Modeling-Systems-864

I do recall seeing a very complicated set of headers on a 289 V8, in a older Ford GT years ago. Very impressive to look at.

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07-28-2018, 05:44 PM	#2
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,186	What is the benefit of a "tuned exhaust" Looks like something that would be difficult to design.

07-28-2018, 05:48 PM - 1 Like	#3
patrick9 Site Supporter Join Date: Feb 2011 Location: Murfreesboro Tennessee Photos: Gallery \| Albums Posts: 3,458	Originally posted by reh321 What is the benefit of a "tuned exhaust" Looks like something that would be difficult to design. As I recall it helps equalize the exhaust back pressure so as to even out the power of the engine

07-28-2018, 05:54 PM - 1 Like	#4
lesmore49 Pentaxian Join Date: Nov 2007 Location: Western Canada Posts: 12,350	Bundle of snakes...as they used to say.

07-28-2018, 07:02 PM	#5
Racer X 69 Moderator Man With A Camera Join Date: Jun 2010 Location: The Great Pacific Northwet, in the Land Between Canada and Mexico Photos: Gallery \| Albums Posts: 28,077 Original Poster	Originally posted by reh321 What is the benefit of a "tuned exhaust" Looks like something that would be difficult to design. Equal length primaries in exhaust allows for equal exhaust flow for all cylinders. All systems have some backpressure, and a design like this keeps everything equal by reducing that backpressure and improving scavenging. And yes, it is a difficult challenge. Racing, much like anything, presents challenges. Overcoming those challenges is how we succeed. The intake is also tuned. Earlier I showed a photo of one of the engines that these headers would be attached to.

07-28-2018, 07:17 PM - 1 Like	#6
EJPearl Forum Member Join Date: Feb 2014 Location: Florida Panhandle Photos: Albums Posts: 51	Excellent weld joints. haha

07-28-2018, 07:25 PM - 1 Like	#7
lesmore49 Pentaxian Join Date: Nov 2007 Location: Western Canada Posts: 12,350	I would think a number of tuned exhausts are custom made. Imagine the measuring, cutting, welding, fitting, etc. that takes place...lot of time. I have seen some of these header modeling kits...which help with layout, etc...before getting the metal tubing out and going to work on it. http://https://www.trick-tools.com/Icengineworks-Exhaust-Header-Modeling-Systems-864 I do recall seeing a very complicated set of headers on a 289 V8, in a older Ford GT years ago. Very impressive to look at.

Machinery Spaghetti

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