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[mustangboy]

  am after a emission control pipe for a 2.5TD omega. its a one piece stainless steel item with two flanges each end. each flange has two bolt holes. one flange bolts to the front end of the exhaust manifold and the other flage bolts to the inlet plenem and operates a type of vacum control unit of some sort.  i am sure its a emission control pipe but if iam wrong please put me right :-)  

[unlucky alf]

well i got mine with it totally missing but blanked off at both ends, but would also like to know exactly what it does!!, i do have 2 of them here that somebody sent me but worried about fitting one in case its been removed for a reason in the past, will watch this post with interest

[mustangboy]

Mine broke over christmas and i have now blanked it off with a 10p piece :-).  seems to run ok but traveled 250 miles on friday and seems to ues a bit more fuel than before and also concerned abut emissions for the next MOT.

[TheBoy]

its egr pipe, they have a habit of splitting...

[Seth]

 am after a emission control pipe for a 2.5TD omega. its a one piece stainless steel item with two flanges each end. each flange has two bolt holes. one flange bolts to the front end of the exhaust manifold and the other flage bolts to the inlet plenem and operates a type of vacum control unit of some sort.  i am sure its a emission control pipe but if iam wrong please put me right :-)  

It's the EGR (exhaust gas recirculation) pipe.

It allows some exhaust gas from the exhaust manifold to be fed into the inlet manifold. These gases lower the amount of oxygen in the intaken air, and therefore lowers the combustion temperature. Less noxious nitrogen oxide is formed.

[TheBoy]

 am after a emission control pipe for a 2.5TD omega. its a one piece stainless steel item with two flanges each end. each flange has two bolt holes. one flange bolts to the front end of the exhaust manifold and the other flage bolts to the inlet plenem and operates a type of vacum control unit of some sort.  i am sure its a emission control pipe but if iam wrong please put me right :-)  

It's the EGR (exhaust gas recirculation) pipe.

It allows some exhaust gas from the exhaust manifold to be fed into the inlet manifold. These gases lower the amount of oxygen in the intaken air, and therefore lowers the combustion temperature. Less noxious nitrogen oxide is formed.

I think on diesels its for economy, not emissions

The inert air (exhaust gas) being fed back in during cruising is same as reducing cc of engine...

[unlucky alf]

so to sum up is it better off with or without it in regards to performance /economy??

[TheBoy]

so to sum up is it better off with or without it in regards to performance /economy??

I got a replacement pipe for mine

[Omegatoy]

Cant have it both ways guys,
off or blanked more power under your right foot BUT heavier fuel consumption,
on and connected and working slightly less power poorer throttle response but a lot better ecnomy
As a side note, reason they break or fracture is usualy the Pclip that bolts near the water pump to support the pipe is missing!! every one i have seen with a broken pipe has had it not fitted

[unlucky alf]

thanks omegatoy, as you say about the support bracket the 2 pipes ive got 1 is missing the bracket, but as im chipped up i wouldnt have thought the difference in power would notice that much, i`ll give one a try when the weather is warmer & see what happens even though my economy aint bad at all its nice to get more for your money!!

[mustangboy]

would you like to sell one of your spare pipes ?  :-)

[unlucky alf]

i would gladly let you have one but it would need a bracket fitting to it, you could use a plastic "p" clip as used by sparkies or get one tack welded on, it is an awkward thing to post mind you but i can try when i get time, you may also find the bmw or range rover diesels use a similar [if not the same] pipe,anyhow i`ll take a look at them in the morning to make sure they aint split as well as they are still as i got them in bubble wrap, i`ll confirm tomorrow & we can sus out how to get it to you if thats o,k

[Omegatoy]

the support bit is literally a stainless steel P clip with rubber to absorb the vibration, one 10mm bolt holds it to the engine block,so should be fairly easy to source!!!

[mustangboy]

that would be great. i will get the correct fittings from vauxhall so its sercurely fitted this time as the centre clip was missing from mine

[unlucky alf]

o,k ive been out in my garage & found the pipes, the one minus the clip has had the clip in a different position to the other but as youd have to fit one that wont matter, at least it isnt split or cracked, i was thinking if you have your bracket & its a clean break as in separated from the pipe with no fracture, perhaps you could leave the bracket in situ, drop the new pipe onto it & cable tie it in place but i`ll leave that to you,[but a tack weld would be better] if you PM me your details i`ll try & find a way of packing it up & get it off to you , oh & as ive never fitted one does it have gaskets or sealing ring as i notice the pipe ends are flared, would be handy to know & dont think vx will have the fittings separate.