RE: thunder tiger .70
I will have to agree with Fuelman on this. That engine is a heli engine, it was never originally intended to go in ground nitro RCs. But it found its way into ground RCs anyways. So, with that in mind, using aiplane/heli glow fuel is the fuel to use, but of course, this engine turns much slower than your traditional nitro RC. And dont think that putting nitro fuel into it will make it turn up to teh 35000 max RPMs you are accustomed to in buggies and truggies.
Now, Bud is onto something there, adding castor lube to up the lube percentage. But, until now, I have not heard of anyone doing this to keep this massive .70ci engine going.