http://autos.groups.yahoo.com/group/cosworthvegas/ Cosworth Vegas - An online club for Cosworth Vega information Fri, 20 Nov 2009 18:19:59 GMT Chris King http://autos.groups.yahoo.com/group/cosworthvegas/message/21290 http://autos.groups.yahoo.com/group/cosworthvegas/message/21290 I've seen it where the nuts are distorted from a PO using a vise-grip or something similar to remove the PAIR tubes. They are pliable enough that you can bend Fri, 20 Nov 2009 15:07:12 GMT doctorduke http://autos.groups.yahoo.com/group/cosworthvegas/message/21289 http://autos.groups.yahoo.com/group/cosworthvegas/message/21289 The correct full system name is "Pulse Air Injection Reactor" system - PAIR, and, as stated, it uses the wave dynamics in the exhaust system to inject air into Thu, 19 Nov 2009 23:38:02 GMT Craig http://autos.groups.yahoo.com/group/cosworthvegas/message/21288 http://autos.groups.yahoo.com/group/cosworthvegas/message/21288 One other thing to remember is that with the pulse air system removed, it makes getting to the distributor lock down nut MUCH easier and of course removing the Thu, 19 Nov 2009 22:58:37 GMT http://autos.groups.yahoo.com/group/cosworthvegas/message/21287 http://autos.groups.yahoo.com/group/cosworthvegas/message/21287 Reminder from: cosworthvegas Yahoo! Group http://groups.yahoo.com/group/cosworthvegas/cal Thursday night Chat Thursday November 19, 2009 9:00 pm - 11:00 pm Thu, 19 Nov 2009 19:54:32 GMT Derian, Gary http://autos.groups.yahoo.com/group/cosworthvegas/message/21286 http://autos.groups.yahoo.com/group/cosworthvegas/message/21286 Pulse air was used on other GM cars during that area. The regular Vega got it in 1977, and perhaps the Iron Duke engine also, but only the Cosworth system was Thu, 19 Nov 2009 18:03:52 GMT Clark Kirby http://autos.groups.yahoo.com/group/cosworthvegas/message/21285 http://autos.groups.yahoo.com/group/cosworthvegas/message/21285 Claudio, all the previous posters have told you correctly.  I remember reading about this system, called the Pulse-Air System, when I bought my car in 1975.  Thu, 19 Nov 2009 17:14:09 GMT reed_46052 http://autos.groups.yahoo.com/group/cosworthvegas/message/21284 http://autos.groups.yahoo.com/group/cosworthvegas/message/21284 Claudio, et al; the pulse air injector tubes and corresponding curved tubes inside the headers can be difficult to remove. I removed mine approx 30 yrs ago and Thu, 19 Nov 2009 16:58:33 GMT hammerdown7 http://autos.groups.yahoo.com/group/cosworthvegas/message/21283 http://autos.groups.yahoo.com/group/cosworthvegas/message/21283 If you are removing the inner tubes, keep in mind that they are curved. As you remove them use an outward-upward direction. Dick Thu, 19 Nov 2009 16:28:53 GMT Derian, Gary http://autos.groups.yahoo.com/group/cosworthvegas/message/21282 http://autos.groups.yahoo.com/group/cosworthvegas/message/21282 The inside tubes are held in by the tube nuts that hold the outer tubes in. Unthread the outer, then pull out the inner tube. I'd expect them to be difficult Thu, 19 Nov 2009 16:18:27 GMT Derian, Gary http://autos.groups.yahoo.com/group/cosworthvegas/message/21281 http://autos.groups.yahoo.com/group/cosworthvegas/message/21281 Those tubes do present some added exhaust restriction. Getting them out after 30 years will be rather difficult. I removed my system from my new Cosworth Thu, 19 Nov 2009 16:18:23 GMT Al Kamieniecki http://autos.groups.yahoo.com/group/cosworthvegas/message/21280 http://autos.groups.yahoo.com/group/cosworthvegas/message/21280 Sounds like the way to go would be, if possible, to remove the internal tubes but for the sake of completeness leave the external hardware in place. Not having Thu, 19 Nov 2009 15:58:33 GMT doctorduke http://autos.groups.yahoo.com/group/cosworthvegas/message/21279 http://autos.groups.yahoo.com/group/cosworthvegas/message/21279 The PAIR system DOES have a significant negative effect on top end power - namely the internal tubes that go "up" the exhaust port to direct air at the valves. Thu, 19 Nov 2009 15:29:52 GMT Al Kamieniecki http://autos.groups.yahoo.com/group/cosworthvegas/message/21278 http://autos.groups.yahoo.com/group/cosworthvegas/message/21278 Claudio I am not sure what advice to offer. My Cosworth had all the pulse air tubing disconnected and removed and the convertor replaced by a straight pipe Thu, 19 Nov 2009 03:48:49 GMT Gary Derian http://autos.groups.yahoo.com/group/cosworthvegas/message/21277 http://autos.groups.yahoo.com/group/cosworthvegas/message/21277 Sorry, I miswrote that. The system does NOT affect the engine performance. Gary Derian Thu, 19 Nov 2009 03:47:51 GMT Gary Derian http://autos.groups.yahoo.com/group/cosworthvegas/message/21276 http://autos.groups.yahoo.com/group/cosworthvegas/message/21276 With those conditions, I'd keep the system. Gary Derian Dear Gary and Al. Thanks for the information. Let me exploit you a little more, if I may. Three points: