Length of header primaries

joespanova · 01-28-2021, 07:58 PM

How much can they vary within the same set without some negative effect on power? 2 inches , 4???

Adger Smith · 01-29-2021, 11:20 AM

http://speedtalk.com/forum/viewtopic...42375&start=15

http://www.exhausting101.com/?p=37
http://www.speedtalk.com/forum/viewtopic.php?t=41836

Check these out & look into Calvin Elston.
He blows away some myths about Exhaust systems.

Alan Roehrich · 01-29-2021, 12:39 PM

Larry Meaux, the guy who does PipeMax software, is another good source.

joespanova · 01-29-2021, 01:14 PM

Thanks guys...Adger , lots of intense reading there...LOL
Alan I have a copy of PipeMax also...I'll take another look. When he gives you a "range" of lengths that fit the harmonic order , then I can only assume that as long as you're in that range , even if there's length variation....you're good to fly.

Wayne Kerr · 01-29-2021, 01:27 PM

Some guys even run unequal length on purpose.....

See you at the races,
Wayne Kerr

Adger Smith · 01-29-2021, 07:43 PM

Joe,
You are correct about the reading... & I am like you on the range of pipe length. I would say hit in there some where in his range. That is exactly how I had my headers built for my V-6 in a Gen 3. Even the steps vary some. They seem to work well. After all the header is just Rocking the TQ Curve up or down...
2 " on a 32" pipe is about 6%.. off the top of my head..

01-28-2021, 07:58 PM	#1
joespanova Senior Member Join Date: Jun 2011 Location: Ga. Posts: 521 Likes: 7 Liked 13 Times in 11 Posts	Length of header primaries How much can they vary within the same set without some negative effect on power? 2 inches , 4??? Last edited by joespanova; 01-29-2021 at 06:59 AM.

01-29-2021, 11:20 AM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Length of header primaries http://speedtalk.com/forum/viewtopic...42375&start=15 http://www.exhausting101.com/?p=37 http://www.speedtalk.com/forum/viewtopic.php?t=41836 Check these out & look into Calvin Elston. He blows away some myths about Exhaust systems. __________________ Adger Smith (Former SS)

01-29-2021, 12:39 PM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,123 Likes: 1,580 Liked 1,871 Times in 422 Posts	Re: Length of header primaries Larry Meaux, the guy who does PipeMax software, is another good source. __________________ Alan Roehrich 212A G/S

01-29-2021, 01:14 PM	#4
joespanova Senior Member Join Date: Jun 2011 Location: Ga. Posts: 521 Likes: 7 Liked 13 Times in 11 Posts	Re: Length of header primaries Thanks guys...Adger , lots of intense reading there...LOL Alan I have a copy of PipeMax also...I'll take another look. When he gives you a "range" of lengths that fit the harmonic order , then I can only assume that as long as you're in that range , even if there's length variation....you're good to fly.

01-29-2021, 01:27 PM	#5
Wayne Kerr Member Join Date: Nov 2003 Location: Out to Lunch Posts: 191 Likes: 2 Liked 26 Times in 11 Posts	Re: Length of header primaries Some guys even run unequal length on purpose..... See you at the races, Wayne Kerr

01-29-2021, 07:43 PM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Length of header primaries Joe, You are correct about the reading... & I am like you on the range of pipe length. I would say hit in there some where in his range. That is exactly how I had my headers built for my V-6 in a Gen 3. Even the steps vary some. They seem to work well. After all the header is just Rocking the TQ Curve up or down... 2 " on a 32" pipe is about 6%.. off the top of my head.. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 01-29-2021 at 07:47 PM. Reason: add%