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Recent content by ElwoodGreen

  1. ElwoodGreen

    Ideal expansion for heat engine?

    I have no thermodynamic properties for R134a. If you have access to a thermo or other book that describes the Rankine & Brayton cycles, it would help your calculations. For both, the idealized expansion process is constant pressure. In reality, you will have internal losses. Use ideal gas...
  2. ElwoodGreen

    Ideal expansion for heat engine?

    If I understand, you are using solar energy to heat the working fluid (I assume you will evaporate a liquid), then you expand through a "turbine" to create useful power. The ideal condition would probably be to expand until the fluid condenses. At that point, you have taken out all...
  3. ElwoodGreen

    Paper on Air Fuel Ratio and Combustion for Natural Gas Engines

    Altronic built/builds all the electronic controls for Waukesha as far as I know--Ignition modules, Detonation sensing modules, turbo control modules, A/F modules, etc. We purchase a few items, such as ignition coils, from an Altronic dealer instead of a Waukesha dealer--saves a bunch of money...
  4. ElwoodGreen

    fuel/air cycles

    My book is dated 1986 and it uses FORTRAN programs. Chapter 3 starts on page 103. It has been way too long ago that I took that class; maybe I can find my 5.25" disk with the program some day. Just glancing at the text and "a subroutine for equilibrium combustion products," it...
  5. ElwoodGreen

    Cylinder liner fracture

    What type of service? If standby power generation, then maybe you have a thermal shock type of problem when you ask the cold engine to produce full power within too short of a time period. Some folks crack a lot of heads and other components that way. If you have too much piston skirt to...
  6. ElwoodGreen

    Paper on Air Fuel Ratio and Combustion for Natural Gas Engines

    Well, our latest failure looks to be a de-lamination of a main bearing. Bearing cavitation has been an issue in the past, and we have 2 units that haven't been "upgraded" with the later style, fully grooved, main bearings. We haven't gotten all the bearings inspected, yet, so I am...
  7. ElwoodGreen

    "Proper" intake air temp (IAT) sensor location....

    Brandnew, If you changed the mass of air internally in your supercharger, then you did something nuclear. The supercharger can only change the air DENSITY. The "mass air flow" sensor should do exactly what it says, no matter where it is in the system. It should tell the ECU how...
  8. ElwoodGreen

    Looking for a base engine component supplier database?

    Have you checked the Thomas Register?
  9. ElwoodGreen

    Paper on Air Fuel Ratio and Combustion for Natural Gas Engines

    We have 5 Waukesha 12V-AT27GL engine-generator packages burning 100% landfill gas (about 58% methane on average). Each unit was factory rated at 2100 kW electrical output. After a series of catastrophic failures (2 connecting rods and 1 crankshaft) we tend to limit output to about 2000 kW...
  10. ElwoodGreen

    Paper on Air Fuel Ratio and Combustion for Natural Gas Engines

    The full link didn't work for me, but I was able to get there from the company's home page. I see a couple of other potentially useful papers and an emissions calculations spreadsheet in the list of downloads.
  11. ElwoodGreen

    Pumping loss & Friction Calculations

    Assuming you spin the engine with an electric motor, you could calculate Watts from the measured voltage and amperage. To get a more accurate value for the engine losses, you will need to know the efficiency of the electric motor. I think that should be all you need. Good luck.
  12. ElwoodGreen

    detonation problems

    willeng, I have found a reference that says too hot of a spark plug can promote detonation, but I think you said you have tried colder plugs, so maybe not much new there? Also, if you have a misfiring cylinder, the others try to compensate and become overworked. Since you seem to be getting...
  13. ElwoodGreen

    Connecting rod stress

    And here is my 2 cents worth: In summary, it depends on the additional load created by extended towing and the original design constraints. The rods will experience cycles of compressive and tensile forces as mentioned in the better posts above. ANY rod will break if the combination of load...
  14. ElwoodGreen

    detonation problems

    willeng, Do you have access to an engine dynamometer? I think most of those shops have spark plugs that are fitted with pressure &/or temperature probes. They can also determine your exact air/fuel ratio at all operating levels. I have not been involved with race engines, so some of my...
  15. ElwoodGreen

    Vocabulary: Collet or Cotter

    This is too hilarious. My Websters Vest Pocket says (if I read the abbreviations correctly) that is is the present tense of be. By the way, if any of you ask a shop tecnician, he will tell you those components are neither collets, nor cotters, because everyone calls them valve...
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