I know that most of the top end stunt engines will run on no nitro fuel. I know that a lot of the older american engines won't run on no nitro fuel. My question is, will the majority of newer sport/stunt engines run on no nitro fuel, like the O.S FP 35, LA 46, Brodak 40, EVO 36, etc.

I've never used nitro in any engine all the way from a Cox .049 up to an SC 1.20 and have never had a problem. The .049's (Babe Bee up to a Tee Dee) were only run on the bench because my son gave them to me, I'd never run one before. However they all gave one flick starts and ran perfectly. Same thing with an old Fox 35 (also given to me) which started on the very first flick and continued to do so hot or cold. That surprised me actually because it was so worn it leaked compression like a sieve and I believe they only have 6:1 compression anyway.

Essentially what I'm saying is that all glow engines will run perfectly well on zero nitro but naturally won't have quite as much power as when nitro is used. Altering compression though does make a difference because virtually all production engines are designed to be able to handle some nitro. Pure nitro can only handle a compression of around 6:1 before detonation while methanol can handle about 17:1 so a blend of the two requires a compression somewhere between these two extremes.

As a for instance of what can be achieved by raising compression, my Enya 61CXLRS has a standard compression of 8.77:1 but with a new head button giving 12.4:1 the HP with the same prop increased by 26% calculated by the increase in revs going from 8800 to 9500 using a Bolly 13.5x5 prop.

I know that most of the top end stunt engines will run on no nitro fuel. I know that a lot of the older american engines won't run on no nitro fuel. My question is, will the majority of newer sport/stunt engines run on no nitro fuel, like the O.S FP 35, LA 46, Brodak 40, EVO 36, etc.

Yes they will

Randy

Cox .049? One flip start??? On no nitro??? That goes against everything I've heard.

Same here. All I'd ever heard was that they'd run too cool on zero nitro so wouldn't keep running but never having ever run one I couldn't argue against it. However when I tried them and found the correct needle setting (a Babe Bee, a product engine with twin transfer ports and the Tee Dee) all of them really did give easy one flick starts with no discernible loss of revs when I removed glow power. I had some fun richening them into a 4 stroke then back to a 2 stroke. The Tee Dee was an absolute gem but what an ear screeching exhaust note .

Now I understand that nitro will give them more power/revs but my intent was merely to prove/disprove the story about using no nitro.

You could drink decaf coffee and no alcohol beer, too, but why?

I've gotten cheap since I have retired.