Helmholtz chamber design differences? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Var · 07-25-2017, 04:01 PM

Can anyone run a clinic on helmholtz design? I've seen designs from basic "j-pipes" to ones with large chambers on the end of the pipe.

I've also seen the diameter of the helmholtz pipe be equal to the main pipe, as well as pipes much skinner than the main pipe. Also have seen different shapes and sizes of the big chamber at the end of the pipe.

I know the basics of helmholtz, i.e., 1/4 wavelength cancelation, and choosing the correct length of piping for the number of cylinders and drone range. But don't know much about those big chambers and pipe diameter

thetyrant · 07-25-2017, 04:09 PM

Check out this thread - http://www.gt86.org.uk/forums/topic/...n-and-proving/

Var · 07-25-2017, 04:38 PM

Quote:

Originally Posted by thetyrant

Check out this thread - http://www.gt86.org.uk/forums/topic/...n-and-proving/

That's amazing...i wish I had an exhaust shop like that around

Williampreza · 07-25-2017, 07:49 PM

Two sources that helped me a lot were John Baechtel's "Practical Engine Airflow: Performance Theory and Application" and (surprisingly) one of the chapters from Jeff Hartman's "How to Tune and Modify Engine Management Systems".

A lot of the info from Hartman's book can be found at grapeaperacing.com

Applies equally to exhaust and intake systems. For exhaust systems, your primary pipes are equivalent to intake runners. From there, it's an easy translation.

07-25-2017, 04:01 PM	#1
Var Senior Member Join Date: Feb 2017 Drives: 2017 Subaru BRZ PP Location: San Mateo, CA Posts: 152 Thanks: 45 Thanked 48 Times in 14 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Helmholtz chamber design differences? Can anyone run a clinic on helmholtz design? I've seen designs from basic "j-pipes" to ones with large chambers on the end of the pipe. I've also seen the diameter of the helmholtz pipe be equal to the main pipe, as well as pipes much skinner than the main pipe. Also have seen different shapes and sizes of the big chamber at the end of the pipe. I know the basics of helmholtz, i.e., 1/4 wavelength cancelation, and choosing the correct length of piping for the number of cylinders and drone range. But don't know much about those big chambers and pipe diameter

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07-25-2017, 04:09 PM	#2
thetyrant Member Join Date: May 2015 Drives: 2012 gt86 Cosworth charged Location: United Kingdom Posts: 24 Thanks: 2 Thanked 9 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Check out this thread - http://www.gt86.org.uk/forums/topic/...n-and-proving/

07-25-2017, 07:49 PM	#4
Williampreza Senior Member Join Date: Feb 2017 Drives: 2017 Ice Silver BRZ Limited Location: East TN, USA Posts: 147 Thanks: 235 Thanked 90 Times in 46 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Two sources that helped me a lot were John Baechtel's "Practical Engine Airflow: Performance Theory and Application" and (surprisingly) one of the chapters from Jeff Hartman's "How to Tune and Modify Engine Management Systems". A lot of the info from Hartman's book can be found at grapeaperacing.com Applies equally to exhaust and intake systems. For exhaust systems, your primary pipes are equivalent to intake runners. From there, it's an easy translation.

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