Tri-Y's Versus 4 Tubes
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Joined: Oct 2003
Posts: 73
Likes: 0
From: Houston TX
Re: Tri-Y's Versus 4 Tubes (2C5only21)
In theory, tri-y's give better exhaust scavenging of adjacent cylinders which helps bulid low end torque. Generally, they will not flow as much volume as long tubes at high rpm's and so long tubes usually have more top end power. However, I have seen good numbers from long tubes on LS1 engines. Biggest mistake I think people make is getting primary tubes that are too big. Too big results in loss of low end torque because exhaust gas velocity is too low for the header to do its job of helping to scavenge the cylinders of exhaust gasses.
Safety Car
Joined: Feb 2003
Posts: 3,865
Likes: 0
From: Chicago il
Re: Tri-Y's Versus 4 Tubes (Dr. Dirt)
In theory, tri-y's give better exhaust scavenging of adjacent cylinders which helps bulid low end torque. Generally, they will not flow as much volume as long tubes at high rpm's and so long tubes usually have more top end power. However, I have seen good numbers from long tubes on LS1 engines. Biggest mistake I think people make is getting primary tubes that are too big. Too big results in loss of low end torque because exhaust gas velocity is too low for the header to do its job of helping to scavenge the cylinders of exhaust gasses.
back pressure helps to create tourqe. The more back pressure the Better the torque.
Racer
Joined: Sep 2000
Posts: 373
Likes: 0
From: Wakefield R.I.
Re: Tri-Y's Versus 4 Tubes (billmartin)
Car Craft Mag. (December03) had a two great articles about headers. They talked about value of Short, Long, Tri-Y's , collectors etc. Worth sending for. You can get part of the story from the web site but not all of it was on line when I looked.
