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The Fix! |
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Binnie discovery! According to a book he has, the high
velocity Gas coming out of the CFI injectors when hitting the Butterflies,
is directed more to the rear cylinders causing the front cylinders to run
lean during full throttle operation! This may be happening due
to the Butterflies not centered (design requirement) & not fully vertical
at full throttle. Interesting to note that I have always had some "pinging" at full throttle even running 91 octane, while the Fairlane's SEFI (port injection) 90 Roller motor (same long block) never pings with 89 Octane! Also a few years ago, I asked Edelbrock if their Performer would work with the CFI & they wouldn't recommend it! Seems to be something to this. The Factory Fix to even up the flow was to add a 20% Deflector Plate! It was a thin SS plate with a gasket on either side. It was a straight "knife" edge, sticking our about 1/4" from the back of the bore. Hard to find, not all Police cars had them as it apparently was a late fix during the 85 production run. None yet on other none "HO" 5.0 CFI cars. Interesting in that the V6's have a horse-shoe shaped deflector edge with the open end to the center. It is a one piece molded plastic sticking out about 0.1". Picture & more info to follow.
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