Four strokes must be a bit different. I ran two engines and both behaved similarly. I noticed no problems with idle or transition in my engines. The idle was fantastic on either fuel. On etherless they ran better at full thorttle. I was getting preignition with ether and had to back off the compression and power was reduced. With etherless I did not have this problem. I hope to get a chance to fly on etherless mix soon.

I have absolutely no compaints about the running qualities of the etherless mix I used. Starting is a problem I'm trying to overcome.

My opinion is that biodiesel without ether is not viable. The data I've seen says it boils at over 300C and flash point is 150C. Flash point of No2 diesel is 52-90C. Kerosene, Jet-A, No1 diesel has a flash point of 38C. If you have ether in the mix to light it I think B100 will run in our engines. If enough of it vaporises at the tempertures we see in our engines it might even burn most of it. But it's not any cheaper than kerosene so if we need ether, why use it?