Hello All,
Right, I have done some test running with the Davis Head. I have used one "can" disc and one from my small stock of thick aluminium foil. They both work, but not all that well. There is a rather vague feeling about the compression adjustment and after a few runs, both discs cracked and the compression seal was lost. Maybe a bit more experimenting is required.
Results, these were taken with a mild brew of diesel fuel D1000, if that means anything. It is the stuff I normally use in my sideport engines like Mills etc. Small props (5 and 6 inch diameter) inflicted some damage to my finger (ouch!). The set up I was using was a bit prone to flooding, so that needs sorting. The engine was well run in and a "Jan" venturi was fitted. 7" inch props were much more civilised and they are the diameter I would use on a 1 cc diesel anyway. First up was an APC 7x3 and I got slightly over 16,000 rpm on this. The only other prop I tried was a Kavan 7x4 and a good steady 12,500 was seen with this. Results were perhaps a little less than expected but considering the mild fuel and perhaps not the best possible venturi diameter, I thought the figures were quite good. I am sure with an optimised set up and hotter fuel, these results could be improved upon. Hot restarting wasn't brilliant, but perhaps not unexpected. I retired with finger damage and now await a Norvel head.
I have no idea how the Wasp will stand up to being diselised! Before you all rush out (!) and try it, remember that if your Wasp breaks, don't blame me!
Oh and I almost forgot to say that the noise level was pleasantly low with the standard silencer. After all, that was the original reason for the post!
Regards,
Andrew.