Header & Torque Question
Thread Starter
Team Owner
Joined: Nov 2000
Posts: 45,085
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From: I was a young troubadour when I rode in on a song, and I'll be an old troubadour when I'm gone.
St. Jude Donor '08
Header & Torque Question
This is somewhat related to e streme's post where he said he lost torque after his header install.
Anyways, I remember reading a long while back that shorty headers make the most torque before the peak torque RPM, and long tube headers will improve torque in the upper RPM range, above the peak torque. Does that sound correct? or I am making this all up? :crazy:
Anyways, I remember reading a long while back that shorty headers make the most torque before the peak torque RPM, and long tube headers will improve torque in the upper RPM range, above the peak torque. Does that sound correct? or I am making this all up? :crazy:
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: Header & Torque Question (X-FireChance)
Think about an organ pipe; the short tubes are high frequency and the long ones lower frequency.
Shorty headers, if involved in any tuning, are at high frequency; long tube headers would have tuning at lower frequencies along with higher frequency harmonics.
So, I believe long tube headers provide better low end torque as well as better high end scavenging.
Of course tubing diameter is also a factor in maintaining torque; note the discussions about which diameter is best for long tubes. As with intake tuning, exhaust velocity is an important factor.
If you care to do the math, there are references on this "header tuning" topic.
Shorty headers, if involved in any tuning, are at high frequency; long tube headers would have tuning at lower frequencies along with higher frequency harmonics.
So, I believe long tube headers provide better low end torque as well as better high end scavenging.
Of course tubing diameter is also a factor in maintaining torque; note the discussions about which diameter is best for long tubes. As with intake tuning, exhaust velocity is an important factor.
If you care to do the math, there are references on this "header tuning" topic.
Burning Brakes
Joined: Jun 2001
Posts: 838
Likes: 2
From: Out by the bridge again, TampaBay
Re: Header & Torque Question (65Z01)
So, I believe long tube headers provide better low end torque as well as better high end scavenging.
Of course tubing diameter is also a factor in maintaining torque; note the discussions about which diameter is best for long tubes. As with intake tuning, exhaust velocity is an important factor.
Of course tubing diameter is also a factor in maintaining torque; note the discussions about which diameter is best for long tubes. As with intake tuning, exhaust velocity is an important factor.
Primary tube length can be used to tune the torque peak RPM range. Generally, the longer the primary tube the lower in the RPM range for the peak of the curve. Tubing diameter affects velocity and flow volume. More variables to consider. :cheers:
