Greg,

That's a good point. But the assertion that 1/2A glows run too cool compared to larger glows comes from the math that says that the cooling fin area as a proportion of displacement is far greater, the smaller the engine, especially with 1/2A. And this is the reason given for poor throttling on the really little guys.

It seems that with diesel, fuel vapourization must be a large factor too, the more ether you run. Kind of like more ether is better but vapourization makes it run cooler, thereby, to a degree, negating the ether's beneficial effects. As in 10% may be good but 20% adds to vapourization cooling and negating the extra ether's benefits. So you add more ether and the cycle repeats. It may be that a much lower ether content can be a sweet spot,,, depending on the engine size. Going to have to get to that TD .010 diesel head soon, I guess.

Brings to mind, has anyone tried blending gas and kerosene? The MSDS for Shellite showed that it was a blend of paraffins (kerosene) and naphthlene (their spelling) with .5% benzene.

Well wait. This reminds me that two years ago, I made up a diesel head for the TD .020 for Raj. I had thoroughly washed the engine parts in soap and water and immediately drowned them in WD40. After assembling the engine and head, I flipped a few times and got a burst. It was a fluke, it seems, I primed with more WD40 and it never happened again.

Arright, I'm off to run the PAW on just kero. Got me a backup crank, just in case.