V8 Engine Pipework?

[SHY 7G]

Hi all could someone out there tell me what the pipes are for that go into the block local to the exhaust manifold outlets?

many thanks

[Pinkrover]

think they where for an early exhaust gas recirculation system for emmission control, I crimped the pipes on one of my old rangies that had this as the pipes had rusted through,

[ThreeSheds]

I think that it's the other way round - not exhaust recirculation, but air injection, but still intended to reduce emissions, and still can be safely closed off. In fact this is the first time I have seen one of these with the pipework attached! More recent engines like mine (1996) still have the casting blanks but are not machined.

[luke keeper of badger]

pulse air rails,do away with em

i went to local nut and bolt guy and brought 8 hex key bolts job done

and it looks tidy

luke

[FridgeFreezer]

From memory it's called Pulsair and is as 3sheds describes, the 6cyl on my 109 had a similar setup too.

[SHY 7G]

thanks all much appreciated.

[Range Rover Blues]

Agreed it's pulse air system, used on Cal spec cars amongst others and seen on repatriated classics. It wasn't used much on the UK because emissions moved on quite quickly once we got on the bandwagon but you see it on some ealry 90s cars prior to cats becoming the norm.

Without the rest of the system fitted and in good working order the pipework s just a pain, remove it and pretend it was never there.

Pulse air works by adding jets of air into the exhaust (it's meant to be callibrated) to get the exhaust gas burning again and lower CO emissions as well as NOx, if I remembr correclty. It does more than just dilute the exhaust.

It was very succesful in the post smog 1970s California market, I'm told.