Active Exhaust ?? what is it ??
Thread Starter
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Tourer
Joined: May 2007
Posts: 337
Likes: 56
From: Joshua Tree, CA
Active Exhaust ?? what is it ??
While looking through the service manual for my 07 bagger concerning exhaust.....
i found the diagrams and instructions for something called "active exhaust" (which thankfully my bike does not have!)
it showed actuators and a cable setup that looks like it turns a flapper valve inside the exhaust pipe.
never have heard about or seen this setup on a harley.
can someone (hopefully an owner that has this setup) tell me more about this setup ? purpose, problems, advantages ??
(oh, by the way, i did a search here first and didn't turn up any results)
i found the diagrams and instructions for something called "active exhaust" (which thankfully my bike does not have!)
it showed actuators and a cable setup that looks like it turns a flapper valve inside the exhaust pipe.
never have heard about or seen this setup on a harley.
can someone (hopefully an owner that has this setup) tell me more about this setup ? purpose, problems, advantages ??
(oh, by the way, i did a search here first and didn't turn up any results)
Thread Starter
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Tourer
Joined: May 2007
Posts: 337
Likes: 56
From: Joshua Tree, CA
thanks, i did google it. should have thought of that first. usually do since i google everything.
i gather it was ONLY required on the quiet loving countries of Europe. never used in US, understandably !!
i gather it was ONLY required on the quiet loving countries of Europe. never used in US, understandably !!
Seasoned HDF Member
Joined: Feb 2008
Posts: 22,999
Likes: 11,439
Yep it is Europe requirement. Another requirement of the Global warm crowd.
This will give you some information
http://www.skutr.net/exhaust-valves-...ors-explained/
This will give you some information
http://www.skutr.net/exhaust-valves-...ors-explained/
Last edited by smitty901; Nov 22, 2017 at 11:19 AM.
Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
Active exhausts are not limited to sound and emission requirements. They have been used over the years for increased performance also.
Buell had an active exhaust that routed the exhaust through three passages. One for low speeds, one for mid range and then high speeds. It is one of the reasons that the Buell XB12XT was rated at the crank for 103 HP and the identical engine except lacking the Buell intake and exhaust on the XR1200 was 90 HP at the crank.
Buell had an active exhaust that routed the exhaust through three passages. One for low speeds, one for mid range and then high speeds. It is one of the reasons that the Buell XB12XT was rated at the crank for 103 HP and the identical engine except lacking the Buell intake and exhaust on the XR1200 was 90 HP at the crank.
6th Gear
Joined: Oct 2017
Posts: 10
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From: central Florida
I just call them flapper valves.
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Tourer
Joined: Sep 2011
Posts: 276
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From: Spokane, WA
Was the active exhaust a factory option on the '70 GTO or an aftermarket item?
MY '07 Vette Z06 came stock w one. Chevy estimates when it is open (around 4k RPM, I think) it adds about 5 hp. I hocked up an aftermarket switch so I can open it up at any RPM. But it is annoying if left open a long time.
MY '07 Vette Z06 came stock w one. Chevy estimates when it is open (around 4k RPM, I think) it adds about 5 hp. I hocked up an aftermarket switch so I can open it up at any RPM. But it is annoying if left open a long time.