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Join Date: Nov 2019
Location: Central Connecticut
Posts: 543
Cis 3.0 vs 3.3

Just wanted to once again thank all the people who have been helping by lending their knowledge and offering assistance

So my latest dilemma is I have two cis systems a 3.3 that came out of a running and my original 3.0l cis systems what one should I use? I leaning towards using the 3.3 I have gone through both of them and the only difference I can see is the 3.0 has a solenoid to nudge the sensor plate to assist during start up …

. so where does this solenoid get its signal to engage ?

also both fuel distributors internally and externally appear to be the same other than the part #s

I am assuming I can use the 3.3 cis as it has the automatic advance rather than the solenoid advance

Other than that they should be the same correct???


Old 04-20-2020, 10:13 AM
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Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
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I'd use the 3.3L version. The FD has more capacity and the WUR will enrich on boost. The air meter assembly is also more primitive on the 3.0L version.
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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 04-20-2020, 05:47 PM
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Quote:
Originally Posted by RarlyL8 View Post
I'd use the 3.3L version. The FD has more capacity and the WUR will enrich on boost. The air meter assembly is also more primitive on the 3.0L version.
Thanks i just need to hear it from someone that the two were interchangeable .

Old 04-21-2020, 03:26 AM
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