 dfwallis wrote:
...The delco rotor has a very long curved section trailing the front edge. From the spark wear, it looks like it has been firing very close to the leading edge where I would expect it to be. I have considered sacrificing one of the caps to instrument it... |
It's a long shot for sure, but there is a slim possibility that there was a manufacturing defect affecting the rotor phasing that has plagued this since time immemorial.
dfwallis wrote:
... The caliper shows it now spaces 5/16 inch consistently all around but I don't know what it should be. The dust cap does behave as a spacer... |
Is it practicable to remove the dust cap as a test to minimize the rotor/terminal gap? Do you know how large that gap actually is?
dfwallis wrote:
Yes, it is difficult to tell if the signal dropouts are just because it lost sync or if the signal really went away. There is no trigger level adjustment. |
This is the major flaw I see with this gadget
dfwallis wrote:
However, the timing light appears to miss signals in the same pattern as the GTC505 (when it shows one miss, the timing light shows one miss, two, timing light shows two misses (roughly)). The RPM view with pulse count view shows this correlation best. The long duration voltage recording charts are difficult to interpret without a timescale and knowing where one sequence begins and ends. The instantaneous voltage chart shows the signal missing periodically, but again, it's hard to tell if it's just a sync issue. |
The high level of noise from the non-resistor wires/plugs seems to give this gadget fits
dfwallis wrote:
I'm hoping that the new scope will allow me to trigger on the points signal and more unambiguously show the spark pulse in relation to it. |
I am most curious to see what develops, please keep us posted
dfwallis wrote:
I'm trying to work up the strength to recheck the valves next month. But if it's 100+f again in the barn, it'll be mighty difficult to make myself do it...( |
It's been mid-90's here in northern Idaho and less humidity than your area, and this old hillbilly pretty much shuts down above 80 degrees nowadays
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