Re: Air shrouded?

[Orin Eman <orin@wolfenet.com>]

> Steve wrote:

> >I was wondering, does air shrouded injectors refer to the injector
> >cooling fan blowint air on them or an internal passage? Is that what that
> >pipe leading to the center of the cylinder head is for? Why are they air
> >shrouded (if that's what the pipe is for)?

> The air shrouded refers to the fact that the later, Viton-tipped injectors
> are not just pressed into the cylinder head like the older ones: they go
> inside a cylindrical  insert which itself screws into the head and provides
> an "air shroud".  These inserts have an additional o-ring associated with
> them, from what I remember.  I've never taken mine out yet, sorry I can't
> be more specific.  

The injectors have a metal cap which has the extra o-ring.  There is a gap
between the cap and the injector which directs air around the injector
nozzle.  This air is routed thru the (plastic) cylindrical insert.
The extra o-ring prevents this air getting around the outside of
the metal cap.  There are non-viton-tipped air shrouded injectors
BTW, my car has them.

The air-shrouding is supposed to give better atomization of the fuel.

Orin.