total timing advance for '40 60 S?

[pauldridge]

I've searched and searched, but have not found a definitive answer as to what the total ignition timing advance should be a cruise RPM (i.e., I presume, max advance).. with vacuum line installed?

None of my manuals have this, and there are lots of comments about "check the timing", but no reference other than static or idle advance settings.

Any experts out there?

Phil  - Austin

[Brad Ipsen CLC #737]

I don't have a reference quickly of where I found this but here is the flathead spec on timing.  The best way to set this up is on a machine.


Engine      Dist       Spark Adv
RPM      RPM      degrees
            
            
1000      500      0 to 1
1200      600      0 to 2.5
1400      700      1 to 4
1600      800      2.5 to 5.5
2000      1000      5.5 to 8.5
2400      1200      9 to 12
2800      1400      12 to 15
3200      1600      15 to 18
3600      1800      18 to 21
4000      2000      21 to 25
            
            
Vacuum Advance            
            
Start movement at 5.5 to 7.5 inches of mercury            
Full travel of .191 to .212 inches at 15 to 18 inches of mercury            
Range of travel expressed in cam degrees equals 9 degrees plus or minus one degree            
            
Actual Start of Movement ________________ inches of mercury            
Actual full travel ____________________inches of mercury            
Actual degrees __________________            
            
Dwell Angle            
            
31 degrees plus or minus 2 degrees            

[pauldridge]

Brad,

thanks so much. that's exactly what I needed.  Just converted my 60 S to 12V (in preparation for an underdash A/C system), was having problems with the ignition, finally traced it to faulty power wire to coil.

Good to see a forum contributor with some real information!

All the best,
Phil