Talked to Tracy.
He's looking for gap in the 0.03 to 0.035" range, but just installed BR10EIX which I think comes with 0.048" (approx) from manufacturer, I think. He just eyed the gaps in the new plugs and called it close enough.

He also ran the stock RX-7 plugs in his Renesis until he ran out of his stock of them.

So it doesn't seem all that critical.

Alter grinding the rotor housings to make room for socket over the AR2502 plugs, I did a short flight (16 mins) today with the old cleaned trailing plugs and two new AR2592 plugs gapped to 0.030". Seems I gained at least 100 RPM on takeoff and climbout.

BTW, measured gap on four AR2592 new plugs and it varied from 0.024 to 0.030. Supposed to be 0.025" from manufacturer. Moral of story is you need to check/set gap on new plugs (where possible).

Probably all common knowledge to you all but new data to me.

Finn


On 5/25/2023 9:13 AM, Finn Lassen finn.lassen@verizon.net wrote: