Injector mounting in manifold.

[Phil Payne]

> I'm toying with putting a cold start injector in the place where the air
> temp sensor is and using the boss in the manifold for the air temp sensor.
> It seems that this should work fine, as the boss was used for the temp
> sensor on earlier cars.

I have a small problem with this.

Given that we know Audi quite often skimped on parts (vide the Audi 5000 doorhandle, the light
switches in almost all cars, etc.) doesn't it seem logical that they would have used just one
MF injector if that was a good idea?

I also don't know of a serious tuner doing it.

Most carburettor cars only have one of the things - high performance cars can have two or
more.  Then we went to fuel injection and all systems (at least, all the ones I know) have an
injector per cylinder.  On the advanced engines such as the W12, each injector actually sprays
two jets - one aimed at the top of each inlet valve.

The cold start injector is a crude kludge that only operates in any event when the engine is
running rich.

I really wouldn't like to do this.  The idea has been unanimously rejected by engineers who
know a lot more than me.

-- 
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803