BendRV-4
Member
I'm interested in getting feedback from anyone who has had experience with the Unison, now Tempest plugs. I have the common cowling clearance problem with the top plugs in my RV-4 and I know the Unison / Tempest plugs have the shorter shaft which will help my issue. Also, my 180 HP Lycoming seems to be prone to lead fouling even if I'm vigilant in ground leaning, etc. I have always run the Champion REM38E plugs in it. I have had one mechanic say that "upping" the number to a hotter plug such as the REM40E will help this. I'm considering switching out my plugs from the Champion REM38E to the Tempest UREM40E plugs. I'm curious if anyone else has tried this and what their results have been.