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  1. magnograil

    Reason for tandem master cylinder for breaking

    Depending on what you mean by "old cars", the brake systems have changed a lot. Newer cars have dual diagonal brakes so a loss of one system still retains one front and one rear brake. Earlier systems had the fronts tied together and the backs on another system or all four on one system. Loose...
  2. magnograil

    Fuel injection

    You might also do a search on MegaSquirt, a DIY fuel injection system. All the schematics and operation details are given.
  3. magnograil

    single dry sump, twin engines?

    Probably the easiest sprag is a one way roller clutch needle bearing such as a Timkin. It does not have the dead space between reversal and drive that a bicycle sprag would have. Without windage trays and trap doors, multiple pick-ups are necessary unless the lateral acceleration does not last...
  4. magnograil

    single dry sump, twin engines?

    You did not state if the engine cranks were tied to each other in any way than the pump drive. Engines do not turn a constant angular velocity when running a "constant" RPM. The crank accelerates with each power pulse and slows during the rest. Any reason the pump cannot be driven by one engine...
  5. magnograil

    Forged vs Billet Aircooled Aluminum Cylinder

    The original Mahle cylinders are nikasil plated. Several places in the US now do it and also repair it. Check the advertisements in Cycle News. Something I would check on the billet cylinders is whether the fillets are maintained at the base of the fins. On both types, what the wall thickness is...
  6. magnograil

    Ignition Key Lock Units

    You might try the motorcycle parts suppliers. I bought a switch with retracting lock pin through K&L ( a m/cycle parts distributor) that was reasonable. It uses the round cylinder type key. Obviously the steering shaft has to have the slot milled into it.
  7. magnograil

    roller chain efficiency

    Check the Morse website. I believe that Hyvo chain is used in high speed highway snow blowers, rear wheel drive of some off road trucks, et cetera. I believe earth moving trucks use hydraulic drive. through a planetary drive in the wheel hub.
  8. magnograil

    PS-300 anti-friction coating

    Yes, the NOrton NRS588 liquid cooled rotary. The center housing is fully coated with MSO2 (the aircraft part), the endplates are only coated around the edge where the tip seal runs. The side seals are running against bare aluminum hence the need for some sort of coating. These are the only...
  9. magnograil

    High Performance Muffler Design

    Suggest you look into the NACA reports on muffler tests. Do not remember the number at the moment, but look at the NASA Glenn site and search on "muffler". They did theoretical calculations and acoustic tests on 77 configurations. Several were built and tested on a 7 cylinder radial engine.
  10. magnograil

    PS-300 anti-friction coating

    Thanks, any idea if this is a better coating than using a soft grade of tungsten carbide in terms of durabilty and wear of the side seals? The rotary has air/oil mist through the interior of the rotors for cooling/lubrication and I will be adding two-stroke oil to the fuel to aid in the tip seal...
  11. magnograil

    roller chain efficiency

    Roller chain has friction when bending each link pin at the sprockets. Hyvo chain uses rocker pins that roll against each other. It also keeps the pins at the pitch line of the drive whereas roller chain goes through a chordal motion with each roller contacting the sprocket. If by "single speed"...
  12. magnograil

    Four-point elevons?????

    Greg has the right idea. Imagine two bellcranks side by side. One set of push/pull rods connects to the centre of each, the other connects to one end of each. The outputs are the opposite ends. Which input is elevator and which is aileron depends upon the throws available/required. If the middle...
  13. magnograil

    Gear position sensor and display

    LCD and LED drivers are quite different. LED drivers only need to source or sink current. LCD drivers have to supply an AC source. Probably easiest to use a micro-controller or specialized LCD driver chips to supply the signals for a LCD driver. Then you need to decide on reflective, back lit or...
  14. magnograil

    roller chain efficiency

    You might want to check out Morse Hyvo chain. It does not use rollers in the joints. The joints are rocking pins so do not have the sliding friction of roller chain. Roller chains have chordal motion lifting each roller over the top of the sprocket arc causing vibration. The drawback is if you...
  15. magnograil

    Gear position sensor and display

    There are IC LED drivers available with BCD input. Simplest is to add a switch for each position (or one switch for forward, one back and one for each lane of the gate), connect the switches through logic gates to convert it to the proper BCD output. National Semiconductor, among others make them.
  16. magnograil

    Intake Silencing Techniques

    Sorry, Quincke tubes are not quarter-wave side branches. I just noticed the NACA 1192 report does not include Quincke tubes but does have quarter-wave side branches. Quincke tubes are two unequal length side branches. One of the NACA reports had the Quincke tube calculations. Unfortunately, the...
  17. magnograil

    Intake Silencing Techniques

    The Herschel-Quincke liners are used on turbo-fans. Download the NACA report from the Langley(?) site. it has the theoretical and experimental data. Just search on NACA reports.
  18. magnograil

    use of ORIFICE for controlling pulsation by pressure wave

    Check NACA report 1192. They made theoretical calculations and experimental measurements on 77 muffler designs including the Quincke tube (quarter wave side branch).
  19. magnograil

    Intake Silencing Techniques

    The quarter wave side branches are called Quincke resonators. Very sharp tuning over a narrow band. Check out NACA report 1192 on muffler design (which, of course, also works on intakes). They made theoretical calculations and experimental measurements of over 70 designs. A note, if two Quinke...
  20. magnograil

    Curb Climbing Calculation

    You need to consider more factors such as whether it is being driven into the curb by the rear wheel or the front wheel is supplying the torque to climb the curb. What is the expected coefficient of friction at the road and curb? Momentum will supply some of the force required. Suspension will...

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