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Re: RPM adjustment screws? 700 1984

posted by  someone claiming to be abe crombie on  Wed Oct 27 15:46 CST 1999 [RELATED]

That motor has an uneven spacing between cylinder firings and to smooth out idle the engine uses two different camshaft profiles. The concept behind this is that the cylinder bank that fires for the short interval should be a weaker power stroke at idle than is the cylinder bank that fires for the longer interval. As a result the air flow into the two cylinder banks must be distributed at different proportions. This is only really able to be done with an exhaust gas analyzer attached to each exhaust pipe just behind engine and then you switch a valve back and forth while the screws are finely adjusted until the CO levels on both banks are as equal as can be obtained. Then the third screw the manual mentioned becomes the total air flow screw to set base idle speed and the other two are not touched.





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