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Why not cast the block in Alusil?

Hi, and welcome. I'm in Brisbane and into engine building as well. My project is a radical re-design of a split single two stroke. You may have been able to help previously, as I had great trouble finding anyone to cast the twin cylinder alloy block for it. Eventually and luckily, the Pine...

I AGREE. The split single 2 stroke motor I've recently built (170 ccs) and run successfully up to 4500 revs is a good example of that addiction. And ideas keep coming back on how to improve on it generally and to make it compliant with emission laws. Not easy but I'm sure working on it.

Does it have a rotary or poppet valve system in it head? Does any one know? ps. My 170cc split single is running fine now and has been tested up to 4500 rpm. ok.

THEY COULD TRY BANNING CIGARTES ,PIPES AND CIGARS AS WELL!

I ONCE RUINED MY 2 STROKE MOTOR MOWER ENGINE BY USING MARINE 2 STROKE OIL IN IT AT THE RECOMMENDED RATIO OF 25:1. SO, IF IT'S AIR COOLED , IT NEEDS BETTER/HIGH TEMP. OIL. MY DAD ONCE OWNED A 1940'S EVENRUDE ELTO LIGHT 4 OUTBOARD. IT HAD ALL BUSHED BEARINGS, WITH ROTARY VALVE INDUCTION AND NEEDED...

PAUL, YOU GO AHEAD. I'M NOT INTO THAT TYPE OF MOTOR. REGARDS, KEN

I once owned an Anzani outboard motor, and have seen a photo of his 1927 V twin world record breaking, 1000cc motorcycle engine. Please tell me what these drawings are for? Regards, Kasey

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.

I think the main noise comes from each vane slamming back into the base of the vane slot in the rotor. On compression the vane is forced back into the rotor at high velocity with little room under it to slow down at the end of its inward stroke, for centrifugal force to change its momentum...

FAR FROM IT. Using only the pistons if possible , the crank, and a doctored version of the crankcase with the 3 cylinders removed along their base line and both ends; then onto that base , 3 pairs of twin cylinders can be mounted across it and on, in the " split single " configuration, each...

That complexity is why I'm working on a split single principle to apply it to a 3 journal c/s. Utilizing a BMW 3 cylinder 750 cc crank, it should be possible to build a 1500cc engine of either 2 or 4 stroke configuration with its own lub. and fuel injection from the bike motor and utilize its...

I'm familiar with the Commer Knocker if that is it. A Pope mower engine from the 1950's had a hollow rotary valve induction craaankshaft which was every effective. I'm finding the 2 vane charger I've built, very noisy however which is a real problem. To get away from a supercharger, I'd like to...

Surely the offset is to give the con rod a small amount of leverage at ignition earlier in the rotation.

Yours seems way more ambitious than mne. All I want is a 3 rod crank for a triple, but with a single cool running inlet rotary valve in the head, rotary valve along the cylinder exhaust ports for 2 stroke type exhausting..... but with 4 stroke operation, and internal lubrication. Haven't found...

I'm doing this on a split single design, where there is an extended time of port opening for both inlet and exhaust, that's why I thought a 2 vane positive displacement vane compressor should work. Vanes have improved much lately to be almost self lubricating, so a ratio of 100 : should keep...

Thanks Byron, What I'm doing necessitates a vane type I believe, as I want a pulse charge timed with the opening of the 2 stroke port in an engine, to by-pass the crankcase so 4 stroke type lubrication via splash can be used. Some of them have self lubricating vanes and...

Dear K2, LONG BEFORE WW1(1910) ALSO IN EUROPE then, TO THE BEST OF MY KNOWLEDGE. Cheaper cars had smaller engines too for economy. Only luxury cars had bigger bores. The split single engine I'm building is almost square at 48mm x 50 with shorter con rods compared to conventional for that type...

And in England, rego fees were based on the bore size...>smaller bore, thus less fees. That retarded progress for many years for performance.

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 +.