Joe,
The HEX-2 is in issue #9 of MEB. I haven't updated the web site yet.
The engine is easy to build but the COX cylinders can be picky - the engine will only run when the fuel level and needle valve are set just right but when they're set it runs great.
Steve is right about the price of the tap. I bought my first one directly from COX for about $50 and was able to get the size off the tap - 17/32x40 TPI. I have to special order them and the current price to order one is now up to $110 - ouch!!! I just ordered 12 so I should have some available at about $50 - economy of quantity.
You definitely can cut the threads on a lathe. Mount the crankcase in a 4 jaw chuck centered over the piston and cut the threads. I did this for the first few prototypes then realized the $50 to COX was worth it :-) If you’re only doing 1 then I would try using the lathe to cut the threads and save the $50.
Steve - I still owe you a V-4 :-) What about the plans for the inline 8 - I got some CNC guys ready to go :-)
Jerry J  |