Air flow meter modification

[Bosch, AN, Andrew, Dr]

Hi all

Maybe someone can help. Firstly, I'm probably going to reveal my lack 
of understanding by asking this queation, but here goes:

The L-Jetronic has a flapper type air flow meter. If one measures the 
resistance along the graphite? track, it seems to change as you move 
a meter along the track in no seemingly logical way i.e the reading 
increases, then decreases, then increases again, etc Thats one 
question. The next is that I was wondering why the following 
shouldn't work: remove the A/F meter and remove the board with the 
sweeper. Then connect the board and sweeper dirctly to the shaft of 
the throttle body. As the throttle opens, there will now be a direct 
drive to the old A/F meter "mechanism". Only problem that I can think 
of is that the relationship between the amount of opening of the 
throttle  and the movement generated at the "old" A/F meter mechanism 
will not be the same as in the "normal" set-up. So I figured that some 
sort of gearing system could be built in, so that eg when the 
throttle is half open, the A/F meter mechanism is fully across its 
sweep. I thought of doing this electronically, but then came up with 
the problem presented at the start of this post, namely that there 
does not seem to be a linear change in resistance in the A/F meter 
mechanism. The reason for all this, of course, is to try and do away 
with the very restrictive A/F meter.

Can anyone help, please?

Thanks in advance.

Andrew

 










Dr A. N. Bosch
Physiology Department/ Sports Science Institute
University of Cape Town Medical School
P. O. Box 115
Newlands 7700
South Africa