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  1. Docengineheat

    Waste Heat Power Recovery?

    I visited "www.keelynet.com". I start being quite skeptical when "pyramid power" and "radionics" are presented as anything other than an example of pseudoscientific thought. Certainly if there are viable ways to recover coolant and exhaust heat somebody other...
  2. Docengineheat

    EGR Exhaust Gas Temps

    I didn't get that from reading the post. . . . "With nearly half a million miles on four Mack tractors equipped with cooled-EGR diesel engines, regional carrier D.M. Bowman reports that initial fuel economy numbers were 4% below non-EGR engines, but seem to be improving as the engines...
  3. Docengineheat

    EGR Exhaust Gas Temps

    Thanks. . . I know about the cooled EGR systems. I was wondering about the temperature of the exhaust gas when it comes from the cylinder and before its cooled. It was my impression that the way EGR works is by slowing down the rate of combustion by decreasing the intake charge oxygen...
  4. Docengineheat

    EGR Exhaust Gas Temps

    Almost all of the diesel engines now being manufactured are equipped with exhaust gas recirculation to lower nitrous oxide(s) production. The system works by effectively lowering the charge air oxygen concentration, therefore lowering peak combustion temperature and nitrous oxide(s) production...
  5. Docengineheat

    How to interest companies in concepts. . .

    Just a question on a general topic. . . . I'm not employed in the automotive or engine industry. But I am an engineer, and I've developed a certain engine modification that has the potential to significantly enhance engine operation. Having reviewed the field in some depth, I am well aware...
  6. Docengineheat

    I am in the process of investigatin

    I suspect this isn't the case, but if the gen-sets are of either Cummins or Caterpillar origin the cooling requirements and radiator air flow can be found at their respective websites.
  7. Docengineheat

    TURBOCHARGED FLATHEAD

    Billyshoppe and Retracnic: Okay, maybe I'll award you guys the coveted supercharger/turbocharger supreme wizard title. You're making it sound like it's no problem at all to run gas engines with 34 pounds of boost (albeit 103 octane gas was used) and 45 pounds of boost. Would you care to...
  8. Docengineheat

    TURBOCHARGED FLATHEAD

    Uh, that 414 ci engine is a diesel engine. With diesel's there is not a problem with high boost pressures, like there is with spark ignition engines. If you can get a gas engine to run with 30 psi boost without an intercooler, you will be accorded the honor of turbocharger/supercharger supreme...
  9. Docengineheat

    TURBOCHARGED FLATHEAD

    There's no way that you would be able to run a 30 psi boost . . . unless you started with a extraordinarily low compression ratio, like 3:1 . . . or you used a special high-octane fuel. You might be able to do it on natural gas.
  10. Docengineheat

    Wiseman engine?

    "A Complex Solution to a Non-Existent Problem" :-D Very well said!! At the very least, and even with a 30 cc engine, they should report what their power output is for comparison runs.
  11. Docengineheat

    Waste Heat Power Recovery?

    tbuelna: I'm not doubting you, but where is the reference on the Scania turbo-compound engine improving fuel efficiency 2%? I didn't see it in the website you referenced. Is there some place else that this figure comes from? In the DEER 2003 (www.orau.gov, following the links to...
  12. Docengineheat

    How to reduce NOx emissions on diesel engines.

    Nodnerb: "A lot of effort has gone into improving combustion processes including , Electronic Injection( they claim V.V.T. is coming but can't quite manage it with so many individual cyl heads at the mo) separate circuit cooling of Charge Air Coolers, increased J.W. temps and the use of...
  13. Docengineheat

    Waste Heat Power Recovery?

    The answer about having the turbocharger followed by the exhaust turbine is that the turbocharger actually increases the efficiency of the engine. So while the turbocharger does increase the exhaust manifold pressure, the corresponding decrease in efficiency from this is more than offset by the...
  14. Docengineheat

    Waste Heat Power Recovery?

    I just checked some figures derived from a diesel engine simulator, set up for a turbocharged Cummins 5.9 liter diesel with the intake manifold pressure at 1.6 atms absolute pressure, and a turbocharger with an 80% efficient turbine and compressor. An exhaust turbine follows the turbocharger...
  15. Docengineheat

    Waste Heat Power Recovery?

    "One problem you face is that the average power output in a car is rather low - in a 200 hp car the average is around 22 hp." I'm not sure exactly what you are saying -- is it that in a 200 hp car only about 22 hp is normally produced? Or is the amount of power retrieved from waste...
  16. Docengineheat

    Waste Heat Power Recovery?

    Granted that the quality of coolant heat is low with a temperature of 200 deg F or so, but the quality of exhaust heat is quite high. The exhaust gas temperature of a diesel engine will be anywhere from 700 to 1300 deg F, while the exhaust gas temperature of a gas engine can be up to 1800 deg...
  17. Docengineheat

    Waste Heat Power Recovery?

    Nearly everybody knows that both gas and diesel engines waste lots of heat from the coolant system and exhaust system. I'm interested in the forums opinions on why there do not appear to be any viable systems that recover this waste energy and use it to improve engine efficiency. What comes to...
  18. Docengineheat

    turbine engine + CVT

    Problems with turbine engines: 1. The bigger the engine, the better the efficiency. Small engines are much less efficient. 2. Very sluggish power response. Pilots who learn to fly in piston aircraft are amazed when they transition to turbine aircraft and see how much time it takes a turbine...
  19. Docengineheat

    Is CO2 cooling a good idea?

    It sounds as if the original intake manifold would be left unchanged; is that right? What you are describing sounds sort of like spraying a CO2 fire extinguisher on the manifold. If that's the case, I suspect that the heat transfer through the intake manifold and into the charge air would be...
  20. Docengineheat

    Energy absorbed by evaporation

    Here's some calculations for you. Assuming 100% volumetric efficiency (which of course it won't be, but work with me here), the amount of air pumped by an engine per minute will be equal to the Displacement of the engine multiplied by the RPM divided by 2. For a 4 liter engine running at 6000...

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