pipes on heads

[Deleted]

On the range rover engine i brought there are 2 pipes run along side the heads by the exhaust manifold that go into the head by each exhaust out let of the manifold can they come of or are they needed because one has snapped of

[Smallfry]

Jesus H Christ Vince............where did you get that from ?

That is an air injection system, which was an emission control device. Because they could not get the emissions down low enough (poor efficiency) for U.S.A. Australia and other foreign markets, they used this as a sneaky way to comply.

Instead of improving efficiency, they pumped fresh air into the exhaust to dilute the exhaust gas.............Its like having a bowl of dirty water and putting more clean water in. The same amount of dirt is still there, but it just LOOKS (and measures) cleaner.

There would have been a belt driven air pump with it originally, so you can safely remove the lot, but you must plug the holes in the head. Unfortunately, most of these engines were also low compression, and had different carb needles, and possibly camshafts too. Probably an 8.13 to 1 compression ratio, and from an early Range Rover ?

[Colin McA]

I bought and fitted a set of these to a 1974 P6 about 2 years ago. I knew a guy who broke them and needed v8 heads.

It is some kind of Extra Air injection system. I got mine minus the pipes so I just got bolts to suit and plugged them

When I first fitted them i hadn't plugged the holes. in the dark you could see the little blue flame coming out of them. I did toy with the idea of glass plugs, that would let you check the fuel burning like a colour tune.

Colin

[Deleted]

Hi all thanks for your help i got the engine from a range rover
second hand parts dealer what size bolts would fit in the holes

[Colin McA]

I can't remember the size I used but stuggled to get the right ones.

The best thing to do would be to take one on the pipes off and compare it with a tap & die set to get the correct thread.

Colin