Stock 1978 308 GTS. All readings from distributor 1-4. With Microswitch disconnected @1060 RPM 11.2 degrees advanced TDC. With Microswitch engaged RPM drops to 930 and minus 4.5 degrees TDC for a total spread of 14.7 between the two. At 5000 RPM Microswitch disconnected, 35 RPM advanced TDC Manual says 10 degrees shift between R1/R2 right? Can the 130 drop in RPM drop the shift into a tolerable range? If not, what should I be looking for here? Distributor problem? I will read distributor 5-8 tomorrow night & report. Oh yeah, I almost forgot...I searched
This is too far advanced for idle. Spread is too large. This is correct. I don't understand this question, sorry. You would need to set the dizzys up on a machine to get the proper #'s you are looking for. But the real question is: why are you using the R2 points? Are the smog requirements in Texas as stringent as California? Also check to make sure your mechanical advance is not sticking. My 2 cents. Joe
Thanks for the feedback Joe! With regard to the question you do not understand, the drop of 130 RPM between R1 and R2 should cause the mechanical advance to drop some which would account for some of the spread, but I do not think 5 degrees. Any idea how much advance at that RPM the mechanical advance would move in 130 RPM? Tonight I will retest it and bring the R2 up to equal the R1 speed first. Should have done that last night. I will check the mechanical advance. I will also see what I get on 5-8 tonight. With regard to why I am running R2. I have read that the retardation is actually is a performance improvement at low RPM. Do you disagree?
I am not sure exactly what RPM the advance kicks in at. I didn't save my notes on mine when I ran them on a machine. I just needed to know they both advanced the same. I'm guessing, but close to idle they are probably doing nothing. The spread between the two sets of points is a PITA to get exact. Euro cars don't have 2 sets. That was utilized for US emissions, so it's hard to imagine it is a performance improvement, even at idle. Surely someone else on this board has way more experience than I on this subject.
