AV8TOR, did you get that PM about testing a new engine? Capt,n

Hi,

Yep, I got it. No word from them though. I would be surprised if we did hear. Thanks though.

AV8TOR

My smallest spark ignition conversion engines is a Gilbert .11 and a OS .15 Max.

The smallest current production gas model airplane engine is the NV-Engines GX-40 engine. It uses a glow plug and is .40 cu in in displacement.

There's also the car gas engines which I believe are smaller use cdi. Made by HPI or Dynamite.

Smaller gas RC engines seems to be the trend as Glow fuel is expensive & messy. Capt,n

Some of those small gas engines are still nearly as sloppy as glow!! The Dynamite .31 is supposed to run 50:1 I believe, but the Norvel GX40 still uses 14% oil as a comparison. The only way you'll get an engine to be less sloppy than a glow engine is to get those fandangled needle bearings on the conrod. Even then, I think 50:1 is too lean a mix even for needle bearing engines. I like 16:1-24:1 even in big high revving engines. Then again, I don't mind the slimy mess a glow leaves behind. Some of you would probably cringe at how much oil my R120 Enya spits out on fuel with 20% castor oil lube.

Yes the problem is the connecting rod using bushings and not using needle bearings. You can't decrease the amount of oil needed as you need oil to be able to get inside and lubricate the bushings on the rod. Also as a engine gets smaller in displacement, you need more oil. The tiny engines under .049 in size need quite a bit of oil in the fuel whereas a huge 50cc engine may only need a minuscule amount in comparison. There have been a number of articles about it so I won't go into it.

Evolution with their 10cc engine, installed needle bearings on the big end of the rod. So technically they can reduce the oil more than a engine such as the NGH 10cc engine that still uses a bushed rod. But even then they may not be able to reduce the oil by as much as some people might thing though.

Yeah I remember a couple of RC car companies selling cars with gasoline engines in them. But I couldn't find references to them lately. So I am not sure if I am doing a bad google search or they aren't out yet. Now then OS has a gasoline glow RC car engine, a .18 displcement if I remember right, that they sell in Japan only at this time. But I can't find references to it either.

Here's the dynamite. Since dynamite is a horizon company I wonder if it's just a modified evolution engine?.

And here's the hpi savage engine.

I'm wondering if the cdi units sold with these engines can be used for other smaller glow engine conversions. Or if they could be used for 4 strokes.

I converted a Traxxas trx3.3(.21) to gasoline using a diaphragm carb, high compression cylinder head, and a super hot LC3 glow plug. I also have a Norvel GX40 which inspired the Traxxas engine modifications.