Well at this point, some of you are thinking that if a engine is set up with spark ignition ...you may as well run gasoline in it. Some engines you can do that, but with other engines the cooling sometimes is a problem. Engines run a lot hotter on gas than they do on glow fuel! In my area I can get strait alky and the price is about the same as gas or lower! Another plus is the smell of alky is not stinky like gas. Keep the input coming. Oh by the way... the guy that set the longest flight record ...used spark ignition. That shows a lot for reliability, and I do not think glow plug ignition would have made it possible. Best Regards Capt,n