you are beating a dead horse jim,i run S&W fuels for years (alum & stell rods) and it is 12%.never an problem. even the Byron's with 16% is more than enough. why people would rather burn more oil instead of more nitro is beyond me??
Not true. A .21 does not need to be slogging thru 18-20% oil and it can actually be detrimental. When I ran .21s my typical blend was 70% nitro and 12% synthetic racing kart oil, something Andy Brown turned me on to years ago. Used to twist the snot out of the MAC .21s with short pipes and never had a bearing problem. The key is the quality of the bearings (I always run Swiss WIBs) good oil AND self control of the remote needle.
I typically get WIBs from mike Cathey (he's on I/W) but others carry them. This is the oil Andy turned me on to, was my go to oil when it was still cheaper to mix my own heat racing fuel. I still use it for record trials when I mix fuels for that-
