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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
CIS fuel distribuitor DYI rebuild.

Found a wright up on how to rebuild your own CIS Fuel Distributor.

Also has info on testing Fuel Pump quantity, System Pressure and Control Pressure.

Has good picture of the metering slits, springs around the internal orifices, and a peak at the insides.

Only weakness is it dose not address verifying balanced flows afterwords. This is a keep point. If it is a non adjustable head, it would mean taking it apart and playing with the shims.

Makes me wonder about modifying the control slits (extend, broaden, or taper cut).

Also wonder about reaming the internal orifices?

Head is from a 928 but still is s good read.

http://www.porsche928forums.com/download/manuals/CISRebuild.pdf
Old 01-04-2010, 12:54 PM
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