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ANY IDEAS ON HOW TO MAKE IT QUIETER? My rotor is only 80mm D and 70 mm long, with 2 vanes. Both the rotor and housing are made of 3D printed plastic.only the vanes are carbon graphite. I've had it running semi-dry at about 2000rpm +.

Yet mine runs at only 1/2 crank speed and it's intolerable without ear muffs. Here is a photo of it dismantled. I need to put a tin liner in now as the ABS vane contact surface is scraping off from the vanes rubbing on it. (shows only one of 2 vanes.)

I'm shortening the vanes by 5 mm and curving the base; that may put a cushion of air there to soften their return, I hope.

By "model" do mean on a 3D printer? I have done that and built 2 of them, each as a 2 vane rotor pumping about 240ccs per vane stroke. Made one in PLA and the other in ABS on steel shafts and ball bearings with seals. Run both under my overhead drill to test them. Have fitted carbon graphite...

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?

In a 2 stroke engine, is there any possibility that an O ring could replace the second ring and survive passing either the transfer or exhaust ports for very long? (even with a very tight fitting O ring on the piston)

Has anyone here ever tried to build simultaneous firing parallel twin cylinder experimental engine, incorporating a single overhead valve for induction, with 2 stroke type portings for the exhaust, and a split-single type head/combustion chamber and con rod setup, to take advantage of the extra...

Eccentric, Thanks for the advice re-cylinder. I'm always looking for alternatives when making just > research ideas into strange engines to see if its possible. and how to do it. Have just realize in my revised design of the crankcase, I could have left off 2 opposite sides and...

Would "tight" o rings work ok on a 2 stroke engine, or just chop up?

In fact DKW were the large parent company to AUDI, the now famous German car maker......and one of those which made up the 4 ring symbol for Auto Union, the actual name of the merged four companies

Here is a "naked" photo of the half "flat four" mounted for the first time on an old Victa base I'll use to test this "single" .....Once the other single block is cast and machined and fitted to make the flat four, I'll need to mount it via a different system, probably on an outboard leg in a...

My next project once these flat twin/ flat four "twingles' are up and running, is to build a single cylinder Victa engine with a rotary valve inlet head only, with a 2 stroke type exhaust, with an exhaust driven valve.

Three years down the track, I'm now finishing a split single engine based on a victa twin mower engine. ..to be eventually a flat four. As a twin first to master the concept, and add another 2 cylinder block later. It seems an engine design put in the too hard basket. It may have great...

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?

Here's a shot of the mock up with plastic cylinders in place...one set with fins, mounted on the alloy plates which form the box crankcase. the open end is where the carbie will be fitted and the magneto on the shaft.