Bear with me on this one as I am new to gas engines and their feeding:
1. Why isn't there a pressure fitting on the muffler of gas engines?
2. Is the oil used to mix wth the gasoline the same as you use with you lawn mower etc.?
3. Are the fuel tanks different in any way from those used in glow fuels?
4. What grade of gasoline should I use, regular or premium?
Finally I should mention that I have been in this hobby for just about one (1) year to date and everything my son and I have built and flown has been either 2 or 4 cycle glow.
I will appreciate ANY and ALL inputs--we are learning.
jack

OK Jack - I'm not an expert, but can answer most of your questions.
1. There is no need for a pressure fitting as gas engine carbs have a pump - this also allows you to place the gas tank where you want without regard to the carb height.
2. The 2 cycle oil is more like that used for chain saws, weed eaters, and best of all 2cycle motorcycles. The mixture ratio is important and will be recommended by the manufacturer of your engine. Most lawn mowers today are 4 cycle and use regular motor oil.
3. The fuel tank itself is not really any different although usually larger. The fuel lines (including the pickup line inside the tank) need to be of a type made for gas and the stopper on some brands of tanks needs to be changed.
4. The grade of gas depends on your engine brand - usually the higher compression types prefer premium and the lower compression types run better on regular. The instructions included with your engine will recommend the correct mixture and fuel grade.

I have found that while premium fuel has a higher engine temperature when run, the engine seems to idle better with premium.

Interesting Geistware! Although I don't need the extra heat right now, 3W is recommending Premium (98 Octane) in their instructions for the QS106 I did as they recommend and am using premium, although not 98 octane. Engine runs like a champ though

Some engines due to higher compression, needs a higher octane fuel. While I know nothing about engine timing, I do know that if you advance your timing, you will need to use higher octane fuel. My Brison is advanced with mechanical timing and I use the premium fuel to make sure that pre-ignition does not happen.

Thanks guys I appreciate your input. Our engine by the way is a Zenoah G-26 and I have yet to read all the instructions--must be my advanced age!!
jack

According to Clarence Lee, a well regarded engine expert, on all our smaller engines as used in RC, premium gasoline has absolutely no benefit in any conditions. According to Hap Mulvany, another small engine expert, says to use as much oil in your fuel mix as you can without fouling the plugs, less is not necessarily better. I have been following both of their advice and have had good luck with their suggestions.

You may have a point there Rodney, but if I ever had to send the engine in for service or warranty work, it would benefit me to be able to say that I followed factory recomendations_bob

Zusie, like any other product you might want to hang on to, when in doubt READ THE MANUAL. Field experts are a dime a dozen
Are they still skydiving at the tecumseh field where the Meyers was made???

Thanks Stalspin,
I am deep in to the reading phase now as our F4U is nearing completion. OH YES, they jump in Tecumseh on a regular schedule from both 172s and twin Otters.
PS NOT ME!!
jack