Notes regarding converting glow engines to gasoline

 Converting glow engines to gasoline is relatively easy to do, however you will find this endevour to be economically impratical. With that being said there are several issues that you will encounter. I will try to cover these issues and offer possible solutions. The biggest issue is installing a spark ignition. This will require custom-made adapters which are not readily available. If you have access to a lathe this will simplify making the needed adapters. Most all glow engines use 1/4-32 size glow plugs. There are 1/4-32 spark plugs available, but they are expensive. You will have to install a gas carb such as a Walbro or Zama and this will require an adapter as well. Again, a lathe will do the job. Once you get past the ignition and carb issues, you have another obsticle. Glow engines use a bushing rod. It's very un-likely you'll find a needle bearing to replace the bushing. This will mandate your using lots of oil in your gas mix. I've tested several ratios and found that 12:1 is as low as you can go without rod damage. To be safe, I'd use 4:1. That's 20% oil which is about what glow fuel is.

So you may be wondering why even bother doing a conversion? Simple, glow engines will fit into more airplanes than production gasoline engines will. Glow engine conversions will also produce more power than a similar sized production engine, and glow conversions are much lighter weight.   

There are several "factory" glow conversion engines on the market. Evolution, MVVS, MARK and BME offer  a few engines. Their engines have needle bearing rods and other modifications to make them suitable for gasoline use. This could be a better alternative. If nothing else, it could save you a lot of grief.

EVOLUTION 26GT 2 Gas Engine

MVVS 26cc Gas Engine

MARK 1.80 Gas Engine

BME 90 Gas Engine