Castor Oil with 30% Nitro 23% Synthetic

A Fox .35 and especially Enya engines which are iron piston will seize up when they're new. The big problem with Fox.35's is the way they were made. The engine is a kit essentially. You get a good one , a mediocre one, or a turd. The fits are poor, the parts are not true or square to one another. The piston liner can be too tight within the case which is very common. So yes, they can lock up when it overheats.
No amount of castor oil is going to resolve those issues nor does it protect it or assist it. It actually creates more issues than good. The castor carbons up and creates even more resistance and heat.

The Enya engines are just fit with closer tolerances not too mention the pistons tend to grow so to speak until the heat cycling declines. They do exactly what you mentioned. They seize, and when they cool they will start up fine. I may have mentioned that and I have seen this many many times.

What I have noticed with synthetics is that everyone on the internet is a chemist. It will be suggested that it will burn off and the engine will be compromised. I have yet to see this happen using Klotz. I can't speak for any other synthetic aside from the Morgan heli-fuel which I have used. In fact the mess as mentioned on the plane is no less than what happens when running full castor. I do know that in cooler weather the synthetic certainly cleans off of the plane easier than the castor as it turns to darn near vaseline on the wing.

In all honesty, I think more engines have been destroyed by using the Cox wrench improperly than those run on the so called piston degrading synthetic fuel. I have no knowledge of the fuel mentioned above. What I was conveying was that I have yet to see a failure in ANY engine using Klotz full synthetic or semi-synthetic castor blend.

I retained Dale Kirn's fuel mix in which the senior 1/2A speed record was made. 65% nitro, 18% oil, 10% synthetic ( Paraplex oil) 8% castor, 17% propylene oxide. The engine used was essentially stock aside from the crankshaft being chromed. If that fuel mixture doesn't destroy a engine, I don't know what does. This engine still exists in someones collection.

Hi Guys
Been running the very high oil content 30% nitro mixture for a few days now. Running very well. Seems to require just about 1/10 turn richer NV setting however the motors are running very sweet. Thought I would pass that on. In the end I ran the 23% synthetic with 6.25% Castor oil so 28% + total oil. It mixed very well and has not separated. Mind you here everyday is in the high 90 degree range so never cool.

No problem at all.

Thanks
Ice

I believe Mr. Cook is correct. It also seems that Wild Bill Netzeband arrived at Ken's conclusions while working at Testors. As I recall, the final formula of Testors brand fuel for Pipe Bombs, Testor-Macs and McCoy black heads was long on synthetic and very low on castor.