 Tail pipe inserts |
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| moggy |
 Jul 3 2014, 03:33 AM
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#1
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Member  Group: Members Posts: 192 Joined: 15-December 04 From: Wales Member No.: 3,285  |
Hi guys
What's the significance of the insert inside the end of this tailpipe? (IMG:http://www.914world.com/bbs2/uploads/post-222-1372820267.jpg) I see it a lot on big vintage 911 engines too. Is it there as a noise control solution, breaking up the sound wave in some way? or is there something else going on? |
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| wndsrfr |
Jul 4 2014, 09:18 AM
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#2
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Senior Member Group: Members Posts: 1,430 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region 
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QUOTE(moggy @ Jul 3 2014, 01:33 AM)  Hi guys What's the significance of the insert inside the end of this tailpipe? I see it a lot on big vintage 911 engines too. Is it there as a noise control solution, breaking up the sound wave in some way? or is there something else going on? Keeps the competition at bay since it looks like a missle aimed at your nose! (IMG:style_emoticons/default/av-943.gif) |
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| crresind |
Jul 4 2014, 09:51 AM
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#3
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Newbie Group: Members Posts: 13 Joined: 8-June 04 From: Oceanside, California Member No.: 2,175 Region Association: Southern California |
This is called "cookie cutter exhaust". Porsche claimed that this was helpful above 8200 rpm on their race cars. I have found that they take some of the harshness out of open exhaust. This is not an "insert", the megaphone is built this way.
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Posts in this topic
moggy Tail pipe inserts Jul 3 2014, 03:33 AM
moggy
This is called "cookie cutter exhaust".... Jul 7 2014, 03:43 AM
campbellcj I thought it was simply to make the pipe stronger.... Jul 5 2014, 10:24 AM Cap'n Krusty A long time ago, these were called anti-reversiona... Jul 7 2014, 05:50 PM '73-914kid The story I always heard was that they were to pre... Jul 9 2014, 08:11 AM zymurgist PitGkp1ncXE Jul 9 2014, 11:32 AM Seabird
PitGkp1ncXE
Laughed my butt off when that video... Jul 9 2014, 02:28 PM |
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