Originally posted by Deathhawk
No running 6 valves w/ DOHC would be pointless.. If you have 3 cams, you could vary timing much more like you can with a rotary, where you can't do that with only 2 ohc.
This discussion is really fruitless as now they are making selonoid valve openers. READ: no camshaft. I think it is renaults 2004 engine...
Well, yes, I suppose. Bear in mind that you can have separate lobes & lifters on a single camshaft set to different lift & duration. My old Tercel was that way. It was a SOHC 12v, and it had two two lobes for the intake and one for the exhaust. The secondary intake valve opened just after the primary (same L & D, I believe). The result was an engine that had a fairly broad torque curve for not having variable ignition or valve timing.
Also consider that five valves is hard enough to make work properly, and therefore not worth the increased cost over a four valve design. That's why Toyota never bothered making a five-valve head after the AE86 Corolla (the engine code escapes me at the moment). So I don't think going to six valves is really practicable.
I have heard of this electronically infinitely variable valve timing. BMW has a system they'll be bringing out soon that makes throttle bodies obsolete. I don't know if they still use cams (I think they do). Basically, you have electronic throttle, and a rocker arm varies the timing, lift and duration of the valves over the entire rev range. It means a flat torque curve and
much improved fuel economy. Not to mention extremely high HP/liter output. 😈
For the record, I still think the Wankel is an inherently better design than the Otto (the reciprocating gasoline engine). It just needs a little more work. Remember, the traditional gasoline engine didn't get to its current efficient & reliable state overnight either.
The thing about the Otto is that it is constantly starting and stopping motion...in other words, it's always fighting itself! Think about that for a moment. A Wankel works
with the laws of physics. You know, using inertia as an advantage by constantly spinning in the same direction. That's why it's so much easier to get big HP out of small displacement motors.
:2cents: No, make that :2cents: :2cents:
and oh so fast. I like that car more than the 911 turbo. I rode in a pretty nice camaro once. I could on and on if I could think of everything I have ridden in. Good day!!
ha ha 
