Hi Chaps

There seems to be an awful lot of "experts" on this thread, just like at my club field

It is perfectly clear that Dar does actually know what he is talking about in this thread and is focused on the problem, unlike some others.

A glow engines timing, two or four stroke is a mechanically fixed period. This 'timing' is set for an optimum ignition point. This optimum ignition point will only be arrived at when all other variable factors are correct i.e. compression, fuel, air and heat. Should any one or all of those factors change then the IGNITION timing will change. Compression will also affect the timing, but although this is fairly well set by the design of the engine, this too can be changed by the fuel.

Too much heat and the engine will run lean, because it will use all the available fuel before it should, leading to advanced ignition. Too much fuel and it won't use all the available fuel because it won't be able to burn it all, it will therefore run rich and have retarded ignition. Too little fuel and you have two situations, one: the engine will run lean (advanced ignition) and/or two: the engine will develop too much heat (advancing the ignition)

Therefore QUOTE "the main function of the fuel needles in a glow engine, is to control the ignition advance" UNQUOTE
or/and, as not stated - ignition retardation.

So Dar's statement, if put into context is TRUE.

The only variable in a glow engine is the fuel! So unless you KNOW different, lets hear it[8D]

I'm sure Dar will be graceful about your apologies

Regards

Steve