Notices
911 Turbo (930) Forum 1975-1989

Can Cam Timing Effect Normal Ignition Timing?

Thread Tools
 
Search this Thread
 
Old 08-27-2006 | 03:13 PM
  #1  
Tripster's Avatar
Tripster
Thread Starter
Instructor
 
Joined: Jan 2006
Posts: 204
Likes: 0
From: Alabama
Default Can Cam Timing Effect Normal Ignition Timing?

The cams installed (SC330) called to be set at 2.2mm - 2.4 mm on the cam card. Then after the cams was installed I was told they really should have been set between 1.8mm - 2.0mm. The cams went in a 2.2 on the money which = (Advanced Cam Timing).
Now the question, We know what the normal ignition timing setting is (26-28 @ 4000), could these advanced cams cause me to use another Ignition setteing?
I am grasping for straws.
I can't figure out why these new B&B headers are glowing red.
Old 08-27-2006 | 05:58 PM
  #2  
slivan's Avatar
slivan
Instructor
 
Joined: Sep 2003
Posts: 101
Likes: 0
From: Buffalo NY
Default

The ignition timing is spark versus posiion of the piston, the cam timing is piston to valve timing. An ignition timing change won't compensate for an error in cam timing, retarding the timing for example makes detonation an issue regardless of the cam timing. I don't have numbers on the sc330 cams but 2.2 seems large to me compared to 1.16 to 1.36 for 964's and 1.4 to 1.7 for the SC's. Worth looking into for sure.
Old 08-27-2006 | 07:58 PM
  #3  
DonE's Avatar
DonE
Burning Brakes
 
Joined: May 2005
Posts: 794
Likes: 0
From: St Johns, FL
Default

I don't think your cam timing is the problem.

Also, who is stating that your cams are not timed correctly, when you have the instructions with the timing range? The mfg of the cam is who you should always listen to. The SC330 is a good CIS cam - I had them on my CIS turbo that produced +400rwhp. You can really have a quick CIS motor with proper cams, proper cam timing, and a good valve adjustment.



Quick Reply: Can Cam Timing Effect Normal Ignition Timing?



All times are GMT -3. The time now is 02:16 AM.