I found this little piece of info.
3 valve, DI, OHV patents are also owned by GM for a more conventional OHV design that might utilize the Mechadyne cam like the Viper is using. All the tech exists, and I am pretty sure is quite producable. More a matter of costs associated with producing such a design. Might end up similar in cost to a DOHC, but would have packaging and weight advantage probably if you used the Mechadyne cam and didn't do the dual cam thing. Really think one or 2 cam ohv could still be less cost than a dohc V8.
What were looking at in a "Super complex, multi-lobe single cam VVT/VTEC" monster cam is this cam below, by a company called Mechadyne International. The last Viper used the "Super cam" see below...
Video contributed by Dragoneye of the basic build and operation of the Cam in Cam (added 6 May 2011)
Our concentric camshafts enable dual-independent Variable Valve Timing or VVT on a single camshaft. Both the intake and exhaust centerline timings can be controlled to give optimum engine performance over the complete operating range. These cam assemblies form a key part of many of our VVA systems, but they are ideal for cam in block pushrod engines.
Our concentric camshafts are:
- In volume production. The new Dodge Viper engine uses a concentric cam.
- The best and most cost-effective solution for phasing adjacent cams on a single camshaft.
- Essential for Dual Independent cam phasing in cam-in-block engines.
- Used in our variable lift and duration system (VLD).