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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,423
Garage
Fred, your engine is a 930/63 California 930?
For that engine there is an extra vac pot that retards at idle for smog purposes. The other vac pot works by preventing further advance in the absense of vacuum. In other words it cancels out the vac advance once the transition to boost occurs.
There was a thread a few weeks ago on this subject where out takes of the factory manual were included. The California 930 is rather complex with the CIS add-ons for smog control.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 10-01-2007, 09:23 AM
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