Header length and size calculator
Originally Posted by Phil99vette
Anyone have a decent program that will calculate header primary size and length?
This is what everybody I know uses. Very good, reasonable price.
Teching In
Joined: May 2005
Posts: 8
Likes: 0
Here is a no cost one http://www.headerdesign.com/login/header.asp
BTW, still loving my Fastchips PCM. It's on a 1997 Yukon you did for me a few years back.
Can you tune for E85 only?
https://ls1tech.com/forums/generation-iii-internal-engine/557583-lsx-motor-built-e85.html
BTW, still loving my Fastchips PCM. It's on a 1997 Yukon you did for me a few years back.
Can you tune for E85 only?
https://ls1tech.com/forums/generation-iii-internal-engine/557583-lsx-motor-built-e85.html
Last edited by Pecos Pete; Aug 15, 2006 at 04:07 PM.
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
Its in my spreadsheet for Valve events.
You can put in your motor specs, and look down the page and it give you header length and primary size.
The formulas I have are:
Header pipe length (in inches) = ((850*(360-EVO))/RPM – 3
Header diameter (in inches) = ((cylinder. disp. * 16.38 / ((hdr len + 3) * 25))) * 2.1
EVO - Exhaust Valve Opens (gross)
These formulas are from A. Graham Bell’s Performance Tuning in Theory and Practice.
For a street engine, the RPM used should be the peak torque RPM. For a race engine, the peak hp RPM should be used. I find that the peak tq numers to be insanely long. So, I use peak HP.
You can put in your motor specs, and look down the page and it give you header length and primary size.
The formulas I have are:
Header pipe length (in inches) = ((850*(360-EVO))/RPM – 3
Header diameter (in inches) = ((cylinder. disp. * 16.38 / ((hdr len + 3) * 25))) * 2.1
EVO - Exhaust Valve Opens (gross)
These formulas are from A. Graham Bell’s Performance Tuning in Theory and Practice.
For a street engine, the RPM used should be the peak torque RPM. For a race engine, the peak hp RPM should be used. I find that the peak tq numers to be insanely long. So, I use peak HP.
Originally Posted by Pecos Pete
http://www.headerdesign.com/login/header.asp
BTW, still loving my Fastchips PCM. It's on a 1997 Yukon you did for me a few years back.
Can you tune for E85 only?
https://ls1tech.com/forums/showthread.php?t=557583
BTW, still loving my Fastchips PCM. It's on a 1997 Yukon you did for me a few years back.
Can you tune for E85 only?
https://ls1tech.com/forums/showthread.php?t=557583
Great! Glad you like it. Guess I'm going to have to work on that. I haven't seen it around here yet. Your not the first to ask about that. If I can locate a source here, I'll look into tuning for it.
Take care, Ed
TECH Fanatic
Joined: Aug 2005
Posts: 1,691
Likes: 1
From: Sunny London, UK
There is a good article by David Vizard here
http://www.popularhotrodding.com/eng...exh/index.html
Plus a good quick size table here http://www.popularhotrodding.com/eng.../photo_04.html
http://www.popularhotrodding.com/eng...exh/index.html
Plus a good quick size table here http://www.popularhotrodding.com/eng.../photo_04.html
Last edited by ringram; Aug 18, 2006 at 04:17 PM.
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On The Tree
Joined: Feb 2004
Posts: 143
Likes: 0
From: Watson ,La.
Originally Posted by Ed Wright
You can buy Pipemax software here: http://www.maxracesoftware.com/
This is what everybody I know uses. Very good, reasonable price.
This is what everybody I know uses. Very good, reasonable price.
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