ORIGINAL: fiery
I'd say you have nailed it Ray.
Dark kero, plus a darkish castor oil. As a natural product there is seasonal variation to the oil. Is there such a thing as undyed unadulterated kerosene any more?
There are a lot of things about the engine that could be improved. That said, for what it cost, it does perform well.
On mine, one pot has a little SPI going on as well!
The intake venturi does screw in to the crankcase. Just like the .15. Next time I run it I will look more closely to see if there in leakage from the thread, or the spraybar holes.
I wonder if Tom Ridley has run his hands over one?
Actually it may be the NVA screw itself. Of the six or so CS diesels I currently own only one didn't need it replaced completely.
Last I heard Tom was very busy keeping up with the demand for hot .19 diesel combat motors so there probably isn't a twin on the drawing board.
The Olivers did produce some twins though, I'll see if I can find some pictures.