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Old 04-10-2011, 07:44 AM   #17
thePill
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Drives: '11 Mustang GT Premium
Join Date: Oct 2010
Location: Kaiserslauthern, Germany
Posts: 1,268
I found this little piece of info.
Quote:
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...
Quote:
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).
Video contributed by Dragoneye of the basic build and operation of the Cam in Cam (added 6 May 2011)
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Last edited by thePill; 05-06-2011 at 04:11 AM.
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