Starting a new project, I am keen at some point to build a Hit & Miss engine and was thinking of starting one but then thought it better if I get another engine under my belt first.

So I have decided to have a go at Jasons design of the Muncaster,s Simple Entablature Engine which he released just over a year ago and sized at 24mm bore. It caught my eye immediately thinking it an attractive looking engine with the four columns and the entablature, just looked a bit different to me.

I am about finished on the Jowitt, just waiting for some compressor fittings and seeing that I have the flywheel casting for the entablature I thought I would make a start.

I have turned the flywheel which didnt need much as it is such a clean and balanced casting plus I bored the wheel for a good fit to a piece of ground bar which will be come the crankshaft. I also turned the crank from a piece of round steel bar, just needs to go on the mill to cut the tapered sides.

Hi George, Nice, when I looked at the pics of the parts I couldnt image what the cross and swing arms would be used for but when I saw the final picture of the engine it all became clear, certainly interesting.

Ron

Just finished the crosshead guides, I thought these may be tricky to make but turned out not to be so.

I machined two blanks (EN3) to size and marked one out as per the drawing and then put them together and machined as a matched pair. Removed the bulk of the waste with the end mill and then changed to a 10mm cutter and worked to the guide lines changing the position in the vice as necessary, checked the dimensions as I went.

They didnt distort much considering they are only 3mm thick about 5 thou over the length of the vertical leg so easily rectified.

A bit of bling, brass crosshead..

Started work on the cylinder its ready for boring just hope my 12mm boring bar does as well as it did on the Jowitt cylinder. I must make up a larger/stiffer bar say about 18mm diameter and make and fit a 4-5mm HSS bit in the end, doesnt need to be complicated. Anyway fingers crossed for the 12mm bar doing a good job in the morning.

Just holes to tap, shape the cylinder front and its finished.

Jason, I drilled the 2 x 3mm holes through to the inlets but not having a 3mm cutter for the notch I used a 3.5 its the closest I have. I could have just cut a 3.5 notch back to the 3mm hole but I counterbored the top of the hole to 3.5mm – 3mm deep, I know its not seen but it just looked better in doing it.

I couldnt see it would be a problem unless you tell me different of course.

Thanks Jason, hopefully I wont need a gasket but if I do I see ARC stock 742 Gasket Eliminator is that what you use.

Apart from honing the cylinder is finished, there is something very satisfying producing parts like this from a block of bar stock, well for me anyway.