The only consequence of a stretched timing chain on spark ignition timing is the rotor phasing will be different. The spark will occur at the commanded time.
Crank sensors/flexplate window misalignment will cause timing to be different than anticipated. Back in the day people moved their crank sensors to change the timing globally.
'99 R/T- MSIIextra fuel/spark/idle, ZCP mx422 supercharged, ZCP Tbrake 727, PPC 10" 3800, 4.10, (\/) Headers, 2.5" Duals, Truetrac, Boyd Timeless 6's, Hotchkis TVS.
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Thinking more about it; the distance between the pullies never changes, so as long as the chain is taunt under load, the rotor will more or less be where it is with a new chain. I have seen wild fluctuation at idle with a stretched chain, but it becomes consistent if you give it steady rpms. I mistakenly applied that logic to total timing and learned something in the process.
My mistake! As you were!
Alan Short
D.R.T.C. #15
Your logic wasn't necessarily flawed if we were talking traditional dizzys that control timing. Their relationship to tdc will be influenced by a worn chain.
99 R/T RC IB
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Stretched chain will also cause late valve timing even when taunt under WOT in the range of 4* and I have seen up to 10* of valve timing retard from a stretched chain. But like Skunk and Chris said, it will only affect distributor phasing and not ignition timing as it is computer controlled.
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The guys on the Ram forums say swapping to a real chain makes a huge difference. Those guys aren't really into mods, so they do one thing at a time as in "Maintenance".
11.27 @ 118.232017 NM Mopar Challenge Series Champion
I definitely noticed after I replaced my worn timing chain. I doubt it's the cause of your miss though.
'99 R/T- MSIIextra fuel/spark/idle, ZCP mx422 supercharged, ZCP Tbrake 727, PPC 10" 3800, 4.10, (\/) Headers, 2.5" Duals, Truetrac, Boyd Timeless 6's, Hotchkis TVS.
Z Code Performance Website