10mm flat coil means a 26-30mm OD coil (10mm is the inside diameter)A 10mm OD coil is tiny! That's the ID of a D-Nail/Auber flat coil. If the SV4 only takes a 10mm OD coil, then i'm out. The temp difference of ~400 degree difference @Dubmonkey is seeing between the PID and the SV4 body is pretty striking, IMO. I understand a temp gun isn't completely accurate, but the temp difference does concern me.
You did miss something. My 1st prototype I was up around the 600+ F mark to get 185C (370F) on the SV3 thermometer. My theory before building the 2nd prototype is that the tolerance for the thickness of the coil needs to be tight to keep it sandwiched efficiently between the plate and the SV3 ... any play in there and it loses it loses 120F to the air vs a tighter fit ... it also then doesn't track as well as the PID gets more out of sync with the SV3 thermometer with more lag.Did I miss something? From what I perceived Dubmonkey was having similar numbers on PID and at bowl as @JCat?
The 1st prototype was ~10 minutes heatup @ 600F on the PID got it at about 180C stable
The 2nd prototype with the tighter tolerances (and half the weight) was ~5 minutes heatup @480F on the PID and it stabilizes at 185C