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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
Join Date: Jun 2008
Location: Detroit
Posts: 896
I am still waiting for the distributor part number, but if this the distributor that I think it is, I have the following comments:
The distributor rotates counter-clockwise.
The pressure capsule mounts the same way as the US version.
Mounted in this way it is not possible to retard the timing with vacuum, only advance it. Vacuum in the capsule will pull the control rod in, which advances the timing.
The capsule under pressure can retard the timing in this configuration.
The vacuum retard curve in the manual is using the term vacuum in the systems sense, as in the vacuum retard system, and not the sense of a negative pressure. I think the chart therefore refers to boost retard at those pressures. The machanism can work in no other way. Porsche would not run a car at 29 BTDC without air temp control, like the C2 has.
This distributor runs on static + centrifugal advance, with boost retard of about 10 to knock it down to 16 BTDC under boost.
Old 03-31-2010, 10:11 AM
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