Posted by deanostoybox on September 01, 2018 at 08:15:11 from (184.105.18.14):
In Reply to: Ford 860 spark plugs posted by ken in wisconsin on August 31, 2018 at 15:17:52:
Pertronix says if you use their "40000V" coil you can open spark plug gap to 0.035".
My 51 8N has electronic ignition, but it is not Pertronix. AL216 plugs that were on the tractor when we got it. Cap, rotor, and wires that were on tractor when we got it. No idea how old they were, looked like candidates for replacement then:-) N.O.S. Blue Streak points FD8081XV gapped 0.025 Condenser is removed. Generic 3Ω coil from something (?) I junked out years ago. GM HEI ignition module NAPA PN TP45 mounted on an old computer power supply heat sink. Points switch module through a signal inverter consisting of a 2N2222 transistor and a 4.7kΩ 1/2Watt resistor. The most current the points see is ~3mA and that load is resistive, not inductive, so there is never any arcing at the points. The points will fail mechanically long before they fail electrically.
I run the plugs gapped at 0.040". Tractor seems to like it. As to improved power and or economy, I had run the tractor around 150 hours before the conversion, and have run it about 550 hours since. I cannot say that I see any noticeable change. YMMV.
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