Rotary Valve BMW inlne six..... yes, rotary VALVES
- Thread starter glhs837
- Start date
valve spring pressure is a major source of hp loss
Rotary Valves have been around 1886
Coates was the 1st RV System I heard of ....
The Coates Spherical Rotary Valve (CSRV) System
Rotary Valves have been around 1886
Coates was the 1st RV System I heard of ....
The Coates Spherical Rotary Valve (CSRV) System
Last edited:
glhs837
Power with Control
SO the brothers, both mechanical engineers, had been talking about building a motor with these just because, well, mechanical engineers. One got laid off so they found the car for the right price and went for it. If nothing else, the one brother used the work in his resume that landed him a job with a diesel engine maker.
MAybe so...but that thing does not sound like it's a powerhouse.
True - Coates Engineering 5 liter rotary valve V8 also spun to 14,500 rpm so maybe that is a side bonus - more usable HP
although I did find this :
What do you make of the Coates test, finding that valvetrain drive took 20 lb-ft of torque in an early Ford Escort engine, presumeably (hopefully!) at the engine's peak torque output rpm? I doubt that an early Escort engine produced much more than 100 lb-ft peak torque, which could mean 20% of the piston power going to drive the valves (perhaps less than that, depending on actual torque output and friction losses elsewhere). Of course this is probably at a much higher RPM than any practical steam engine would run at full power, but considering cutoff the steam engine's valve velocity could well be higher even at much lower rpm, thus more hp required for valve drive, perhaps even with uniflow and half the valves/cams (now 10% of power wasted in cam valve drive?).
https://steamautomobile.com:8443/ForuM/read.php?1,1719
so maybe it isn't that much after all ...
.... I was lead to believe otherwise some yrs ago .... it was one of those beer and pretzel what if discussions ...
... and maybe the guy I was talking to was referring to a older 60's Era V-8
someone else I knew in the 1990s wanted to replace cams / valve springs with solenoids
glhs837
Power with Control
Still a development mule at this point. And might not ever live to it's potential. They are looking at gains in the upper RPM band, but obviously need to lick the oil problem first.