Re: All the Fuel Flap - some help 4U

[steveb@falcon.kla.com (Steven Buchholz)]

> 
> On Wed, 5 Jun 1996 PDQSHIP@aol.com wrote:
> > My understanding of the FD is that you have a slightly different plunger slit
> > size with the higher compression motor in the MC series motor....   As well
> > as a slightly revised cone shape in the air flap.... 
> > 
> 
> Actually, I dont think its as much the shape of the cone, but where the 
> flap sits within the cone. On the CIS-E (4000q) the flap sits at the top 
> of the cylinder part at the bottom of the cone. Where the KL it sits at 
> the bottom.
> 
... actually the shape of the cone is critical as it determines how much fuel
is metered with that air.  You are correct that the rest position must be set
and the airflow measuring plate needs to be centered.  

You should actually be able to affect your mixture by changing the slope of 
the cone.  Has anyone ever played with this method for enrichening the mix-
ture at high flow rates?  Since you want more deflection at a given flow,
it seems to me that you would be able to put an insert into the airflow 
sensor to make things richer (as opposed to having to machine ... hone? :) 
the cone.  

BTW - if anyone is interested in this stuff, I found the Bosch K-jetronic
manual to be very informative.  The same stuff is probably mentioned in the
Probst book as well ...

Steve Buchholz
s_buchho@kla.com
San Jose, CA (USA)