Projection

[Mike Jones]

One of my concerns as well.  The marine installation manual indicates that 
the proper position is in one of the individual exhaust runners, just 
before it enters the water cooled exhaust manifold.  This doesn't seem like 
a good idea either (although if you chose one farthest away from the TB you 
would improve your chances of having the inboard cylinders running rich, 
which is better than lean at least).  Also, that means that the sensor 
would have to be mounted upside down, which is supposedly not good for long 
term health of the sensor.  So I dunno.  Maybe I'll go back to plan A which 
is to not use the sensor at all.

It's easy enough, though, to install the sensor.  I think what I'll do is 
tune it w/o the sensor (as the manual describes) then hook up the sensor. 
 If performance noticeably decreases or if I pick up a lean stumble then 
I'll know that the sensor is in the wrong place.

Mike J.

>>lkurek at smtpgate.anl.gov wrote:
     I wouldn't do this at all. From what I recall, the EGR feed is through 
     the center two exhaust ports in the head. So, assuming the intake
     manifold is properly restricted to bias the flow through the intake in 
     one direction...you will only be reading the O2 output from two
     cylinders. If you stick an injector in one of these cylinders and get
     a rich reading at the O2 sensor, and the ECM leans out ALL the
     injectors...you will be running very lean...which is not a good thing.

     TTYL!

     Larry>>

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