From what I've read, too hot of plugs can cause that. Low octane causing pinging, pre-ignition, can cause that. Some say running too lean causes pinging. I'm sure timing plays a part too. High compresssion pistons cause it too. Pinging blows holes in piston. New cars use ultra sonic mics to alter timing, EGR, perhaps fuel to cool thing off a littlt to prevent pinging on low octane fuels.
I had a 62 Jag, 9.5:1 compression,that needed high octane leaded gas or it would ping. I had to retard the spark to lessen the pinging. I let the car sit. Sold it 11 years ago for 5 times what I paid for it.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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