What was your favorite nitro engine?

[nativepaul]

I have been all electric from the start so I have never used an IC engine in a model. I do however like any glow engine that wont start especially if the owner has no electric starter and has to keep pulling, flicking or stropping by hand, I find the noises guys make rather amusing especially if they are even more offensive than the offensive droning of the engine should they get it started in the end.