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I have finally got the bulk of my home grown split single re-assembled after adding more stuffing to the crankcase to reduce its volume and improve the charging. Photo shows it minus the mag. flywheel, coil and carbie.

After additions to the inside of the crankcase to improve its compression ratio, and getting the head machined with cooling fins, my 170 cc split single/ (twin) is now ready for mounting on the test bed mower base for a higher rev test. The G4 carbie has also been re-jetted to handle the higher...

I've finally got it all together to e able to start the split-single 2 stroke engine which, along with 2 of my sons, Philip and Ian, designed, then first fabricated, partly in wood and from a 3D printer parts, and now have assembled, from machined alloy castings etc, and parts along with other...

Does anyone know what the minimum compression ratio for crankcase compression is for a 2 stroke engine, to start/run adequately ? ie 1:1 or would 1:2 or even lower be adequate?

Have now finished the box crankcase, have had cast one cylinder pair, and had one head machined all without cooling fins so far. as they can be machined in/ fitted on later. The magneto is fitted with a good spark. as is the carbie and reed valve. As this is as intended, half a flat four, based...

Has anyone built a small Judson type vane supercharger?

Has anyone ever attempted to build a "split single engine" using the same principle as employed in a Daimler Puch 250cc SGS twin motorcycle engine?