Originally Posted by
djgoku
Just broke in my RB R3 yesterday, motor was 2.75 turns in LSN, 5.5 turns in HSN, RB 6 Plug, 40mm shims in head, 40% nitro fuel, Doing lots of smoke coming out of the turns, but running really hot 148 C (298 F) and running rich, still needed to close HSN, to perform
This is my first RB
My Question is, Do these engines Run Hotter than 300F? like Nova P12, any Needle setting you may recommend?
Tanks
The nitro % and head shimming are not good at all. I would recommend using 16%, 20%, or at most 25%. The head shimming should be:
16% = stock (.3mm; one silver shim)
20% = .4mm
25% = .5mm
40% nitro is WAY too much content.
Your motor was probably detonating with that high of content and so low of shimming. If so, the head button should be ashen looking and pitted.
How many tanks did you run it like this? During my own motors *rich* break-in, the temp was around 200F while it four-stroked around the track. I had the following settings at that time (10 tanks):
HSN: 5.5 turns out
LSN: 2.5 turns out
These motors don't run that hot at all. After leaning it out for another 10 tanks, the temp was around 260F-265F. It just finally broke in yesterday, after a little more than a full gallon of fuel, and the temp went down to 220F, still slightly rich, but running pretty strong.
