ORIGINAL: codfish
ORIGINAL: rcpattern
Ziomarco,
I have been running the OS 1.20AX I have for over 2 1/2 years now on 30% heli fuel with no issues. There are multiple advantages to 30% nitro, the biggest of which is the fact the engine runs cooler. This is very beneficial in a cowled scenario. Also, the added oil content is better long term for the engine. What I would not recommend is over propping the engine trying to gain more performance that way, but picking up a few hundred RPM is no different than running a pipe. You wont have any problems running 30% fuel in any of today's glow motors as long as you stick with the recommended prop sizes.
Arch
Arch,
Really curious how a higher nitro content makes an engine run cooler. Can you explain that one to us?
Furthur more why would an engine manufacturer's specify a maximum nitro content?
Higher nitro content helps an engine run cooler because your needle will be at a richer setting. Nitromethane is an oxidizer and although in it's raw form it has half the power of methanol it also takes half the oxygen to burn that methanol does so it works as a power increaser by helping combustion, but you also put more fuel through the engine.
Now as for why a manufacturer would give a suggested nitro range, that is much simpler, pre-ignition. Depending on compression ratio of the engine you might need to shim the head on a glow engine to use a hgher nitro fuel. I have yet to own an engine that would need shimmed on 30% but that is only my personal experience.