Rotary Valve Engine 3.0 Reving
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- เผยแพร่เมื่อ 8 ก.พ. 2025
- Homemade axial flow rotary valve engine reving. The engine ran for an hour straight during this video, now with 2.5 hours of run time on version 3 of the head.
Approximately 8:1 compression ratio show here. Max RPM shown is about 4K, but it could go much faster. 100cc's, based on a Briggs and Stratton model N engine. Stock engine is 1.5 hp.
I designed a valve very much like that one about ten years ago. It had the head split in half. Lower half sealed off the top of the cylinder on the bottom side and had the intake and exhaust port in it and the top side had the lower half of the bore in it that the valve laid in. The upper half sealed over the top of the valve. Lubrication is a real problem, so I designed mine to be made out of ceramic. No expansion and contraction issues and no lubrication issues. You can do a multiple cylinder engine by placing all the valves crosswise and driving them with with a shaft and helical gears. Good luck. Carey
Carey Robson I built an inline six engine in a 1999 BMW 328is. You can check out the videos on my channel.
getting some endurance in.... good job man it's looking good
Cool update to an old engine !!!!
this would be fun on my old 250
Bro make the valve and seal with macor material(machinable ceramic)and let me know the advantage, sealing quality and life of the valve... Thank you
Though ceramic would be a cool material to use, it's expensive and this application just doesn't need something that exotic. We've had excellent success with the high lead bronze seals we have been using. They are easy to manufacture, expand just a bit more than the steel under thermal expansion preventing seizure, and can be easily lapped to size. We didn't want to take the exotic route, but instead decided low surface pressures on a large sealing surface to reduce wear. Once it runs, a little carbon buildup fills in any gaps and it seals very well.
so let me see if i understand correctly does this intake through the "cam" gear and exhaust through the back of the rotating tube?
stanja28 in one end of the tube and out the other end.
what do those blue springs do
They in theory hold up the floating seal underneath the valve during the intake stroke when it wants to get pulled down by the vacuum. But in reality, they don't do much once the combustion pressure pushes it up into the valve a few times. I have the on my E36 Rotary Valve engine too, but they probably are not necessary.
MrPizzaman09 oh cool thanks man
have you got any videos explaining that.
Mower Innovations No, not really. I should make an explanation video once I'm done with my car and start to seriously show it off. I have a belt routing video that shows some more detail on my channel.
MrPizzaman09 cool thanks man
what is the gear ratio?
1 rotation of the "cam" or tube to 2 rotations of the crank. that's how all valve-trains work