Using Denso plugs and having trouble finding documentation for plug gap.  I think it is .016.  Verification appreciated.

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Hi David, my Azalea Aviation manual indicates AC Delco plugs AC 44F with a plug gag of 0.035”.  Your distributor point gap should be set at 0.029 when we and when it reaches 0.016 should be serviced.  Fuel should only be 100LL.  If you want more specs and a torque chart I’ll be happy to share with you via your email address.

John Minatelli

To get a good answer you need to specify what conversion (William Wynne, Azelea, maybe this is a home-made conversion?) you are using and what type of ignition you have. The stronger the ignition the larger the plug gap is set. Magnetos (weak power of spark) use gaps around .016 - that would be most certified engines and some conversion engines. Coil and breaker point ignitions use around .035 gap (stronger power, can jump a bigger gap and make a more vigerous spark) while modern electronic ignitions use spark plug gaps as large as .060 (very powerful electrical charge so jumps a huge gap and makes a very potent spark).

Do you have a manual for your engine? If not you should get one.

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