jeff2wings Posted April 29 Author Share Posted April 29 Got too spend a few hours on this over the last couple of days Hi 4 Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted May 1 Author Share Posted May 1 Having got out of jail with the exhaust duct time to finish the cylinder and make the head and intake rotor shaping the combustion chamber snug fit ! Quote Link to comment Share on other sites More sharing options...
brokenenglish Posted May 1 Share Posted May 1 Here's my Atom Minor running on glow, at a time when I didn't have an ignition circuit. I'll run it on sparks as soon as we get some decent weather (reasonable light for photos/video). Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted May 1 Author Share Posted May 1 It would be interesting to see if there was any increase in performance over petrol/ignition vs methanol/ignition vs straight glow,l will using a altered head shape for increased compression ratio along with a ringed aluminium piston as used in the Mk2 Atom Minor Quote Link to comment Share on other sites More sharing options...
911hillclimber Posted May 1 Share Posted May 1 Are those Hemmingway castings? Mine look nothing like as 'matched' as those in the running engine. Quote Link to comment Share on other sites More sharing options...
brokenenglish Posted May 2 Share Posted May 2 (edited) Here's the "other side" of my engine. Note the adapter, under the glow plug. I don't think the castings can be "Hemmingway" (whassat?), as this engine has been in my possession for more than 40 years. Your build threads have motivated me to run the Atom on sparks ASAP. I'm looking forward to it, but the weather is b-awful. I would expect the Atom to perform a bit better on sparks than on glow, but that's of no importance for me. "Nice running" is far more important than minor performance differences. I seem to remember that, decades ago, castings sets were marketed by a model engineering firm in Oundle, maybe my engine is from those. Edited May 2 by brokenenglish Quote Link to comment Share on other sites More sharing options...
911hillclimber Posted May 2 Share Posted May 2 Thanks for the details. Hemmingway are the company now selling the materials/castings for the Atom Minor Mk3. Quote Link to comment Share on other sites More sharing options...
brokenenglish Posted May 2 Share Posted May 2 Following my earlier post, a bit of Web browsing confirmed that the castings source I mentioned in Oundle was called "Woking Precision Models", and that their range was taken over by Hemingway around 2006. Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted May 3 Author Share Posted May 3 Last major component now finished, now need to finish the induction side ,make prop driver and a pair of piston rings, oh and several hours hand finishing the castings so they don't look like I made them with a blunt chisel. 1 Quote Link to comment Share on other sites More sharing options...
jeff2wings Posted May 6 Author Share Posted May 6 Still plodding along whenever I can, not too much of a problem with the weather as it is😒 made the prop driver ,took two attempts in order to get the look/fit that I wanted and did a bit more to the second set of castings 1 Quote Link to comment Share on other sites More sharing options...
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