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If you are following the Julius plans then the crankshaft web or inner flywheel as he calls it is of enough mass being 80mm dia x 15mm thick, no additional flywheel needed

Regarding your groove dimensions again I would suggest you check with the supplier's design guide, it will give the groove dimensioning needed with tolerances for your application. I use the James Walker guide, always works for me.

I would suggest you check the surface finish on the cylinder walls and compare with the O ring supplier's design advice - in a reciprocating application a rough surface will eat the rings.

I have seen the suggestion that the connecting rod is 2.25 - 2.5 x the stroke (2W on your drawing) for a slow speed crosshead engine. L is determined by 2W + the needed clearances as mentioned previously so no need to include in any relationship between conrod and stroke.

A bit larger is good and will not cause any issue, in fact it will tend to improve the slow speed running of the engine. Points to consider are the aesthetics, does it look in keeping with the rest of the engine and also are you able to machine the rim and bore the hub in one setting to...

Hi I am not an expert but I understand your query. I am also starting a scratch build wobbler and when I look at a few published designed I see the ports are in line at TDC and BDC so will make mine similar. I am pretty sure the engine will run with quite a wide tolerance away from the centres...

That's good progress for a day's work. Looking forward to the spherical piston.

Hello Gordon I suggest you re visit the Loctite solution. Parts properly sized and prepared will hold together, for belt and braces after the setting you can use pins too. I use 638, get a push fit then lightly score/scratch the surfaces and then clean with a solvent. I have made several...

Hello Ken I used the J de Waal plans found here https://modelengineeringwebsite.com/USS_Monitor_imperial.html good luck , Andrew

1/4" x 40 tpi sounds like a Model Engineer (ME) thread

Hi All Having just made an introduction I thought I would show the Potty Mill and Monitor engines I have built. Both were made pretty much according to the published drawings though on the Monitor I made some detail changes to reduce the reciprocating weight and have a single air feed through...

Thanks Jack. I have based my engine on the OHC version which I thought was the simplest after looking through the single cylinder engines on the net. I have the frame, cylinder and and crank completed so far, and am about to bore the frame for the main bearings after deciding on a compression...

Hi All Just signed up after being a visitor for a long while. Over the last few years I have built a Potty Mill engine and a Monitor and now have my first IC engine under way based on one of B Rupnow's engines. My workshop is in the garage and I have an elderly Myford that has had a hard former...