• Oct 23, 2008
The good 'ol four stroke internal combustion engine has life left in it. Despite the fact that the world's oil supplies are getting more expensive and harder to extract, the short-term truth is that there's still no cheaper way to power a vehicle than with petroleum. This being the case, engineering work is still being done on the basic design of the engines that power our cars, motorcycles and scooters. Further proof of this truth comes by way of Taiwanese scooter manufacture PGO, which has partnered up with RCV Engine Ltd. of the U.K. The two firms are working on rotary valve technology for scooters. So far, the rotary valve engines have really only made waves in the model aircraft industry, a market that RCV is very active in, but PGO believes the engines in the 125-150cc range could power its scooters.

The technology seems rather elegant and does away with the valvetrain of a four stroke engine, a major source of losses and maintenance. The cylinder, including the combustion chamber, rotates around the piston as it moves through its stroke. Click here for more details on how the technology works. PGO hopes to reduce the costs of engine manufacturing while increasing power and lowering emissions. So far, though, no specific engines have been announced.

[Source: CENS via 2 Stroke Buzz]


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    • 1 Second Ago
  • 9 Comments
      • 6 Years Ago
      Paulwesterberg
      That is completely true.
      But the Tesa roadster's battery costs as much as a honda accord and will only last for five years at the most.
      • 6 Years Ago
      "truth is that there's still no cheaper way to power a vehicle than with petroleum"

      This is entirely, completely false, for $4 in electricity you can go 200 miles in a tesla roadster. The amount you would have to pay to power an electric scooter would be even less, around $1 per 100 miles.
      • 6 Years Ago
      Tesla's lithium cells will not do 1000 cycles, 300 with care, at most 500, maybe. I dont think a replacement pack will be $20k, much lower I think.. they use common industrial lithium laptop cells. Labor, and the monitoring electronics in the pack may cost more than the cells themselves.
      • 6 Years Ago
      Valvetrains are a "major" source of maintenance? Since when?

      Really, when is the last time you've even *known* of a car that needed a valve job? (Exempt from this question: Owners of vintage British cars)

      Yeah, many cars still have cam belts - but a belt every 100K+ miles is hardly "major". Full disclosure: All vehicles in my garage have chain-driven cams. Zero valvetrain maintenance in a combined 400K miles.

      The maintenance claim is bogus. Efficiency is another story; they'll have to prove it works in real-life use.
        • 6 Years Ago
        MikeW -

        Few of my Honda-owning friends pay attention to the valve clearance adjustment portion of their maintenance schedule - yet the engines still seem to run forever. Even then, valve clearance adjustment hardly qualifies as "major" maintenance.

        My original point stands: Modern valvetrains are remarkably durable; justifying a replacement by claming they have major maintenance requirements is false.
        • 6 Years Ago
        Honda, most of their engines do not have hydraulic valve clearance adjustment.
      • 6 Years Ago
      my first reaction was "this is how vespas have done it since the 60s," but no, this is completely different. a rotating cylinder? weird!
        • 6 Years Ago
        these guys have been doing rotary valves for a long time. I've been waiting for some one to pick up their technology. coatesengine.com
      • 6 Years Ago
      Yes you need to factor battery wear as well.

      When you "tank up" the Tesla with $4 of electricy you are burning one of the precious battery cycles.

      With probably well under a 1000 cycles and a pack costing at least $20000, that $4 of electricity is dwarfed by $20+ of battery wear.

      Not to mention that standard lithiums will also age themselves to death just sitting on a shelf.

      All electrics have this issue. Battery+electricity cost more than gas. This is why we have always been waiting on battery breakthroughs.