- Modern automotive spark plugs have greatly evolved from tractor era engines
- Automotive spark plugs are more reliable and capable of running in much worse conditions
- The adapter keeps cylinder thread from wearing out
- It's OK to use CHT gasket probes
- The adapter is made from aviation grade aluminium bronze, no temperature stress to the cylinder head
- Installation is reversible, you can always switch back to aviation spark plugs if you wish
- Replaces both REM and RHM spark plug types
- Very cheap to operate, even with Iridium type sparks: save money and get fast ROI!
Minor modification of HT wire required (reversible).
Replacement spark plug type may vary from engine to engine, however NGK BR9ES might be a good start.
You can go to BR8ES from there if it's fouling during normal operations, or to BR10ES if it's overheating. Or you may try several types and decide which one is the best for your engine.
Please make sure you've got genuine NGK sparks, copies are much less reliable.
Pictures are taken on my C172 with Continental O-300D engine, Slick mags.
I use these adapters myself for several years and so far have had no spark plug related issues with cold starts, misfire, lean operation, radio reception etc.
Thanks for looking and happy flying!