Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

NeilBlanchard · 12-26-2009, 08:47 PM

Yes, it is a cam driven engine, like the Revetec (that I mentioned earlier). The problem with a crankshaft engine is the maximum pressure occurs when the connecting rod in nearly straight up, and there is very little leverage that can turn the crankshaft. (A lot of force is trying to bend the crankshaft...)

With a cam driven engine, you can design the amount of leverage you have; rather than being locked in to a sinusoidal piston motion.

On the Shepard engine, is the combustion sleeve inside (and concentric with) the rotating cam sleeve? I wonder why the levers are required at all, then?

12-26-2009, 08:47 PM	#14 (permalink)
NeilBlanchard Master EcoModder Join Date: May 2008 Location: Maynard, MA Eaarth Posts: 7,908 Mica Blue - '05 Scion xA RS 2.0 Team Toyota 90 day: 42.48 mpg (US) Forest - '15 Nissan Leaf S Team Nissan 90 day: 156.46 mpg (US) Number 7 - '15 VW e-Golf SEL TEAM VW AUDI Group 90 day: 155.81 mpg (US) Thanks: 3,475 Thanked 2,952 Times in 1,845 Posts	Yes, it is a cam driven engine, like the Revetec (that I mentioned earlier). The problem with a crankshaft engine is the maximum pressure occurs when the connecting rod in nearly straight up, and there is very little leverage that can turn the crankshaft. (A lot of force is trying to bend the crankshaft...) With a cam driven engine, you can design the amount of leverage you have; rather than being locked in to a sinusoidal piston motion. On the Shepard engine, is the combustion sleeve inside (and concentric with) the rotating cam sleeve? I wonder why the levers are required at all, then? __________________ Sincerely, Neil http://neilblanchard.blogspot.com/ Last edited by NeilBlanchard; 12-26-2009 at 08:56 PM..