on "euro" injection.....

[andrew.stauffer@cannondale.com (Andrew Stauffer)]

Okay gang, it's winter time, garage projects are well underway,  there isn't
much seat time, a good time to do some bench racing and
engineering................

The topic is CIS"euro injection".  I'm going to ramble on a bit about the
subject, please correct or adjust my thinking as necessary.  
At any rate, this has puzzled me for some time and I'd love to hear some
thoughts.   AutoXers, I know this is a little OT, but please bear with me,
there isn't alot of traffic these days.......  

Euro Injection- It's a thick lipped 80mm CIS flow cone/fuel dist/control
pressure(or warm up reg) regulator.   I'm under the impression that it will
add some power over conventional CIS and CIS lambda.  This is the way the
eBay add reads, the way that RPI sells it, and the way that the end users
seem to feel about it from conversations that I've had.   In a nutshell, it
drops the O2 sensor/frequency valve from the fueling equation, runs richer,
and therefore provides more power.  Accurate so far?  

But-and here's where I get confused- If I want my CIS lamda fueled 2.0 8v
motor to get a richer mixture, I can dial it in with the 3mm mixture control
adjustment in the airbox/fuel dist.   So I'm left to wonder, if I unplugged
the O2 sensor and dialed in more richness, were is the benefit to Euro
injection over this?  I know from experimenting/experience that unplugging
the sensor will result in higher emissions and lower mpg, as I'm told the
Euro inj will.   I don't see where the euro inj is any diff than cis lambda
with the O2 sensor unplugged.  Anyone got any ideas on that?      Doing this
for CIS lambda will make the full throttle enrichment non functional, which
is not a good thing in my experience.  Dan Bubb can back me on this.  Is the
Euro inj air cone shaped such that this full throttle enrichment is not
necessary, it's already "in there" and accounted for? 


Going beyond this simple a/f mixture adjustment , I've heard folks say that
you could also reshim the control pressure reg. in the fuel dist itself(not
the block mounted cpr or warm up reg), and arrive at a richer(via higher
system pressure) mixture.  What's  this offer that dialing in a richer
mixture as above  via the 3mm  does not?    I assume you'd have to uplug
the O2 sensor for this trick to be of any benefit, but again, I must be
missing something.  I have never tried this, no first hand experience.   But
again, richer is richer, there must be a reason that this doesn't equate to
"euro" standards as well.   Still with me? 

The crux of the issue:  If I want rich, I can get rich with the stock stuff.
So if there is truly any benefit to euro injection, it doesn't soley lie in
it's ability to run rich.  What makes this stuff special?  It comes highly
recommended from some, I'm thinking it's supposed performance benefits
wouldn't be that hard to emulate with any ole CIS fuel dist.  

 Whaddya think? 


Andrew Stauffer
Cannondale Purchasing
www.cannondale.com
andrew.stauffer@cannondale.com
ph. 814 623 4516
fax 814 623 8917