Equal length vs regular shortie headers
05-15-2009, 05:53 PM
#12
1st Gear Member
Thread Starter
Join Date: Apr 2009
Location: Florida
Posts: 128
Basically what you're dealing with a cost/benefit analysis -
Regular shorties are FINE for stock applications. They dont (usually) require changes to the h-pipe/cats, they're (usually) easier to install, and they're cheaper.
TUNED shorties are more commonly used in applications where the owner is trying to squeeze more ponies from the engine.
Tuned shorties use primaries that are equal length, and, as such, cause the exhaust gas pulse width to end on a node, rather than an anti-node/mid extension. This helps with exhaust gas scavenging.
Shorties used without a complete air tract (intake, heads, headers etc.) defeat the purpose of tuned headers. As the air/exhaust speeds up and slows down as it moves through the motor it kills the positive linear acceleration curve that would otherwise be obtained through the use of a polised system.
/physics.
Regular shorties are FINE for stock applications. They dont (usually) require changes to the h-pipe/cats, they're (usually) easier to install, and they're cheaper.
TUNED shorties are more commonly used in applications where the owner is trying to squeeze more ponies from the engine.
Tuned shorties use primaries that are equal length, and, as such, cause the exhaust gas pulse width to end on a node, rather than an anti-node/mid extension. This helps with exhaust gas scavenging.
Shorties used without a complete air tract (intake, heads, headers etc.) defeat the purpose of tuned headers. As the air/exhaust speeds up and slows down as it moves through the motor it kills the positive linear acceleration curve that would otherwise be obtained through the use of a polised system.
/physics.
05-15-2009, 09:32 PM
#14
2nd Gear Member
Join Date: Feb 2008
Location:
Posts: 461
I have long tubes,but can't compare the differences because I haven't run anything else back to back with them.They sound very nice though.My neighbors appreciate them and the off road x single chamber flow combo.
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