Announcement

Collapse
No announcement yet.

Rotary valve engines.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Rotary valve engines.



    What do you think of this??
    Ryan The middle child is always ignored
    BP powered 97LX Touring Edition
    Vibrant strut tower brace, KVR front brake pads, Tungsram Megalicht H4 headlight bulbs, Phillips Halogen H3 foglight bulbs.... 91 GT rims w/ 195 60 14 Yokohomo Mirada GTX sport

    #2
    Re: Rotary valve engines

    A very interesting concept and it certainly looks good on paper. The rotary valve concept has been around for years probably coming into its own now because of advances in material technology. The ability to eliminate the valve head, stem, guide and guide boss as restrictions to flow is certainly appealing.

    Consider this, however. Probably further along in development at this point is direct injection of fuel in gasoline engines. Here, the fuel injector is mounted directly in the head and injects directly into the combustion chamber rather than injecting into the port. Such a placement obviously requires much higher injection pressures than port placement. In other words, direct injection in gasoline engines is similar to that used in diesels. There are many advantages to this method, performance and otherwise, as opposed to port injection, but to stay on topic I'll only mention one. The intake port and valve, as in the case of the 4-stroke cycle diesel, now only has to flow air as opposed to an air-fuel mixture. All else being equal, as a consequence an inherently higher VE obtains, making conventional poppet valve restriction less of a factor. In such a situation, the advantage of the rotary valve over a conventional one may not be as great, at least on the intake side.

    I read the entire article which I found very interesting. However, on page 10 there is a serious error which somewhat weakens one of the arguments for rotary valves.
    "In addition, valves in high compression engines cannot open before top dead center. If they do, they will make contact with the piston and engine destruction occurs."
    Clearly, this is incorrect. As the piston is moving towards TDC on the exhaust stroke the intake valve is already beginning to open and is substantially open at TDC. The exhaust valve of course is still open at TDC of exhaust stroke. If this didn't occur, valve overlap would not be possible and scavenging and charge filling would suffer. Many high compression pistons are cast or forged with valve cutouts to prevent contact.

    In any case, a new technology that seems to have some promise and worthty of attention.
    02 DX Millenium Red - The Penultimate Driving Machine
    MP3 Strut Tower Bar kit; Cusco Front Lower Arm Tie Bar
    MSP Springs, Struts, Stabilizer Bars, Trailing Links, #3 Engine Mount
    Kartboy Stabilizer Bar Bushings; Nyloil Shifter Bushings; Red Line MT-90 Gear Oil
    MP3 Shifter, Knob and Aluminum Pedal Set
    Suvlights HD Wiring Harness; Osram Night Breaker H4 Bulbs; Exide Edge AGM Battery
    Summer: 5Zigen FN01R-C 16 x 7" Wheels; Yoko S.drive 205/45-16s
    Winter: Enkei OR52 16 x 7" Wheels; Falken Ziex ZE-912 205/45-16s
    Modified OEM Air Intake; Racing Beat Exhaust System; Techna-Fit SS Clutch Line
    Denso SKJ16CR-L11 Extended Tip Spark Plugs; Magnecor Wires
    Power Slot Front Brake Rotors; Techna-Fit SS Brake Lines; Hawk HPS Pads
    Red Line Synthetic Engine Oil; C/S Aluminum Oil Cap
    Cyberdyne Digital Gauges: Tach; Ambient Air Temp; Voltmeter

    Comment


      #3
      it gets rid of the problems of valvetrain rpm limitations.

      on the other hand, it'll flow like ****... always. so you just nullified your benefits.
      "Never run out of real estate, traction & ideas at the same time"
      -93 MR2, 129 ES
      ClubProtege.com Tech Articles

      Originally posted by WTF
      Remember low compression makes more space for AIR, HEEELLOOOO!

      Comment

      Working...
      X