Having managed to buy some castor oil, which at times was looking like mission impossible, I was surprised at how thick (viscous) it is.

The castor would normally be diluted down considerably when incorporated into a commercial fuel mix. The castor oil in a commercial model fuel would be around 24%

The modified olive oil I make is not as viscous but... there is a larger quantity of it in the fuel around 33 % or so.

Is the extra quantity of olive oil in the fuel going to offset the fact that it is less viscous than the castor ?

The castor must surely become much less viscous when diluted down with kerosene and ether ?

Am I missing something here ?

Reg