This is sooooo interesting!

As far as I understand, a 2stk gasser can quite easily run on 2:1. That would be 2 parts Gas to 1 part 10/10 Glow Fuel, and that the plug has no problem staying lit.

The issue with a 4stk gasser is that the plug is less likely to stay lit if run as a gas/glow, because the methanol content is not enough., and it's the reaction between the methanol and the platinum in the plug which keeps it lit.

Since the Methanol content in this scenario is the same as for a 2stk, I assume the issue is because the 4stk is firing less often, so in any given time, the methanol supply is only half that of a 2stk, plus the heat supply is halved as well in the same time period.

So, we can easily double the methanol supply, by changing the glow fuel content, i.e. 1:2, Gas to Glow Fuel. To avoid smokiness, perhaps the oil content of the Glow Fuel could be reduced.

As regards the heat, onboard glow is a possibility I guess, but adds weight.

Many people have mentioned that gas/glow engines run a little cool - a few have reduced the size of cooling fins to compensate. I seem to remember it's something in the fuel which does this.

What is it that keeps the engine cooler, and could that be played-with in the fuel mix to keep thngs hotter in there?

I am by no means an engineer and would never claim to be, but it seems there is lattitude for experimentation with a 4stk gasser, to run it on gas/glow without need for onboard glow, negating the need for the extra weight, complexity etc.

It seems plausible that this could be achieved simply by playing with the fuel mix.

How about 1:1 gas to glow, reduding the oil and nitro in the glow to keep the overall oil/nitro content the same? That would nearly double the methanol content.

Does that make sense?

Best to all,

Roger.