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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,410
Garage
Well I just lost my 20 minute reply on how the CA dizzy works, complete with page references. Dammit that blows.

In a nut shell; the CA dizzy is unique. If you look in your shop manual you will see that one side of the pot is connected to the vac source under the throttle plate while the other side is connected to three sources; the air pump, boost, and back to the vac source under the throttle plate. The port connected to the vac source retards the timing at idle for emissions. On the other port the boost signal is used to activate the boost retard valve, which in turn allows the dizzy to loose 2* of advance on the other end.
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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 09-11-2007, 06:44 PM
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