The Bristol car compagny used sleevevalves in their luxury models prewar (they are very quiet), and made the Hercules radial airplane engine and later the Centaurus for use in a number of, mainly, bomberplanes. After their teeding problems they were very well liked. Napier used the system in their Sabre engines, H24s, used in Hawker Typhoons and Tempests, they became very powerfull. There is a guy making a chopper with a singlecylinder sleevevalved engine now, he is about to be finiced. I always liked the type.
as did Knight in the US (Daimler, back in the day used those engines and same of their own design)...he has that one not smoking, that is amazing in itself.
The Napier Saber was high revving (by aircraft standards (up to 4000RPM )) with a massive power output of up to 3000 BHP. This made the Hawker Tempest MK5 one of the most significant fighter/ground attack aircraft of the late war. Similarly, the massive power output of the Bristol Centaurus 3000+ BHP made the Sea Fury capable of 460mph and still a significant aircraft in the Korean War. Sleeve-valved engines could be excellent and, when supercharged, could take high boost pressures, avoiding pre-ignition due to hot exhaust valves.
Not much need for a sleeve valve after 2-stroke engines were designed. 2-stroke engines use ports in the cylinder and have fewer moving parts. Nice to have a sleeve valve engined bike as a museum exhibit, though.
@@johndumarney1630 Right. 4-stroke. Aproximately half the power of a 2-stroke. But with no requirement to mix oil into the fuel. Still have the oil burning & heat problems of a sleeve-valved 4-stroke to deal with. But, I can understand why they fell out of fashion. Interesting museum exhibit and piece of history, though.
![BOWKYLION - วิงวอน (ex-change) [Official MV]](http://i.ytimg.com/vi/cLdnZWDaO-w/mqdefault.jpg)
Two unique historical museum pieces - a sleeve valve bike and Sammy Miller : )
I am so glad that folks are taking the time to make what will some day be priceless archival recordings of Sammy.
The legend Sammy Miller!
The Bristol car compagny used sleevevalves in their luxury models prewar (they are very quiet), and made the Hercules radial airplane engine and later the Centaurus for use in a number of, mainly, bomberplanes. After their teeding problems they were very well liked.
Napier used the system in their Sabre engines, H24s, used in Hawker Typhoons and Tempests, they became very powerfull.
There is a guy making a chopper with a singlecylinder sleevevalved engine now, he is about to be finiced. I always liked the type.
as did Knight in the US (Daimler, back in the day used those engines and same of their own design)...he has that one not smoking, that is amazing in itself.
Great bikes, nice filming.
Cheers from Greece.
Thank you very much!
That's a top quality bike..❤ i'd never heard of this maker before, thanks for the video😊
That bike looks pretty stylish. I hope I'm still riding around when I'm that guy's age. If I live that long.
what a beauty
The Napier Saber was high revving (by aircraft standards (up to 4000RPM )) with a massive power output of up to 3000 BHP. This made the Hawker Tempest MK5 one of the most significant fighter/ground attack aircraft of the late war. Similarly, the massive power output of the Bristol Centaurus 3000+ BHP made the Sea Fury capable of 460mph and still a significant aircraft in the Korean War. Sleeve-valved engines could be excellent and, when supercharged, could take high boost pressures, avoiding pre-ignition due to hot exhaust valves.
Man, I bet you'd be the hero of the Burger King parking lot in 1925, riding in on THAT bad boy
The NAPIER Sabre was capable of revving up to ~4,000rpm
Not much need for a sleeve valve after 2-stroke engines were designed. 2-stroke engines use ports in the cylinder and have fewer moving parts.
Nice to have a sleeve valve engined bike as a museum exhibit, though.
Sleeve valve is 4 stroke though.
@@johndumarney1630 Right. 4-stroke. Aproximately half the power of a 2-stroke. But with no requirement to mix oil into the fuel. Still have the oil burning & heat problems of a sleeve-valved 4-stroke to deal with. But, I can understand why they fell out of fashion. Interesting museum exhibit and piece of history, though.
Didn't the Brough special engine use sleeve valves?
Does this bike have any connection to the peerless car company?.
They were unreliable and prone to failure. Beautiful just the same… 👍🏻