>Yes, you can do like the major polluters did back in the late
>60s/early 70s and put taller (longer) smokestacks on the car to hide what
>you're spewing.....
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It's not as much a question of mixture adjustment in regards to dirtying up
the back end of your vehicle as much as where it exits. When exiting
directly in the center of the rear of the car the exhaust is subject to the
turbulence caused by the rear of the car as it "plows" through the
airstreem. As such the gases don't exit smoothly but are swirled around
and some of this encounters the back of your vehicle. There is an some
amount of greasy combustion by products that stick to this surface and
attract dust, dirt, etc. True, if your are running rich, the unburned
gases will have a higher solids content, and will cause the "sooty"
appearance much faster. But the fact remains, no matter how "clean" you
tune it for, if you have rear/center exhausts you will be cleaning the back
of your car more than if they exit the side/rear where there is a more
direct rearward airflow, that carry these gasses away from the car - been
there done that, many years ago!
Barry Schwartz (San Diego) bschwart@pacbell.net
72 V6 Spitfire (daily driver)
70 GT6+ (when I don't drive the Spit)
70 Spitfire
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