Hi guys...
Just had a general query ...
I've heard a lot and seen a lot ... so i just need some more opinions / experiences
What is the lifespan of a nitro engine ... specifically, race competition engines ... .12 and .21
Ive heard of instances where engines are needed to be rebuilt after every race meet ... ive heard of instances where an engine (unopened) has been used for a whole year worth of race meets without any issues whatsoever ...
Another "fact" that i have heard is ... the use of specific fuels will determine the 'lifespan' of a motor ...
For instance .. .12 motors using 15-16% nitro fuel ...
A motor using a fuel with say for example 11% oils [Nitro X - they dont list how much % syn and castor oil is in it, just a total figure of 11% oils] has far less lifespan than say the same motor using another fuel with 20% oils [Hot Stuff - they state it has 15% syn oil and 5% castor oil] - Apparently, genearlly the motor running the fuel with less oils has around 30L of fuel life before a rebuild is required as opposed to the motor running the fuel with more oils has 80L if not more no sweat of fuel life before a rebuild is required ...
The apparent logic / reasoning behind this is because the fuel with more oil in it lubricates the engine, whereas the fuel with less oils in it doesnt lubricate the engine at all, or has very little lubrication for the engine, and therefore, has a lower life span, up to half that of the engine running the fuel with more oils in it.
Also, the fuel with less oils in it, makes the engine work harder and produces more performance ... lets say for example / figures sake, the fuel with less oil allows 95% potential to be reached .... than the fuel with more oil allows only about 90% potential to be reached ... again life span is decreased accordingly.

Also, it is believed that the fuel with less oils, overtime, about after 1L of fuel, the engine has a build up of 'gunk' on the internal surfaces and hence makes starting and tuning a biatch ... as opposed to the fuel with more oil, leaves no build up at all and hence starting and tuning is a breeze .....

Experiences and opinions?

Cheers guys