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  1. Paulista

    Power and torque curve dips

    hemi, This is what I located in the text that I had referrred to in my previous posts on this thread: Start of Quote: Inlet air density reduces; Hence, engine mass flow rate falls; Since the diesel fuel pump still supplies the same quantity of fuel, air-fuel ratio falls and exhaust temp...
  2. Paulista

    Power and torque curve dips

    patprimmer, When zero self-regulation was stated,zero power output was implied too ! The wastegate appears to act as a limiter - containing boost at high revs/load - on a turbocharged IC engine installation optimised for developing respectable boost at low-to-mid range...
  3. Paulista

    Power and torque curve dips

    patprimmer, You have emphasised that it is not only the spring pressure, but also the presure of the ambient air that acts on the diaphragm that holds the valve closed. The pressure exerted on the face of the valve seat in the exhaust assembly would seem to be a...
  4. Paulista

    Power and torque curve dips

    hemi, The loaded-spring/diaphragm arrangement that comprises the wastegate should only budge if the pressure for which the former assembly has been adjusted/calibrated for is attained during operation. So unless the latter value of boost pressure is attained, the wastegate will...
  5. Paulista

    Power and torque curve dips

    hemi, Agree that at low revs and load, with a prevailing lower ambient (barometric) pressure, boost pressure should be correspondingly lower than when ambient pressure is at nominal value. The waste-gate mechanism I am familiar with is operated by bleeding off a sample of the boost...
  6. Paulista

    Power and torque curve dips

    I have read in a relatively recent reference-type of text book relating to modern developments in IC engines that the turbo-charged engine is a self-regulating (feed-back) type of device. For this reason it is stated that engine torque vs rpm curves are more or less the same, say, between...
  7. Paulista

    e85 temperature problem

    rdd48856 (Chemical) Thanks for the timely input ! Brazil (???? ) Successfully fuelling engines with alcohol, over more than two decades to this date ? Paulista
  8. Paulista

    VE bosch pump

    The adjustments are sometimes intuitive and at other times purely empirical. But they are time-tested and repeatable events and form the great mass of knowledge called "technology" in everyday parlance. If warranted and economically justifiable, a cause-effect (scientific ?) explanation could...
  9. Paulista

    VE bosch pump

    Spectric, GOOGLE has just delivered the site I had originally in mind: http://dodgeram.org/tech/dsl/more_power/Power_ve.htm It gives you the detail you were looking for concerning the BOSCH VE pump and there is even mention of BOSCH VE pumps as fitted on Land-Rovers (in French, though!)
  10. Paulista

    e85 temperature problem

    joszman, On older carburetted 1,6 /1,8 litre VW alcohol-engines here in Brazil, VW fitted a 1-litre petrol-carrying cannister . A little electric pump shot some petrol into the alcohol carb for cold starting when the temp fell below 10ºC. Never a starting problem , ever...
  11. Paulista

    VE bosch pump

    Spectric, My MWM 4-cylinder turbo-diesels are also so equipped(Bosch VE), the same being the case for Dodge Ram trucks of a certain vintage fitted with 6-cylinder Cummins turbo-diesels. At the time I did a search on GOOGLE (Dodge Ram etc) and found detailed adjustment info on...
  12. Paulista

    Uprating a 4-cylinder turbo-diesel engine

    Much obliged for the feedback, Fabrico, Ivymike and Metalguy The OEM 4-cylinder 150 HP/2600 RPM has a counter-rotating mass geared to the crankshaft to mitigate vibrations. This is not a particularly noisy or rickety-rick engine. Would this balance be affected if this engine were uprated to...
  13. Paulista

    Uprating a 4-cylinder turbo-diesel engine

    Consider the following: 1. Manufacturer XYZ markets a 4-cylinder after-cooled turbo-diesel as well as a 6-cylinder after-cooled turbo-diesel, both for the truck market. These engines share a (near) identical design, with all major parts interchangable, excepting of course, fuel-injection...
  14. Paulista

    Gluing SS 304/316 to Polyurethane

    Thanks rnd2. No trouble at all to drill (machine) an undersized hole for a SS threaded rod - as easy as saying cheese ! But should I decide for the 2-pack PU solution, what material is the mould to be made of ? Will it be reusable ?
  15. Paulista

    Gluing SS 304/316 to Polyurethane

    I was contemplating building my own motor mounts, using a polyurethane(Shore 90)rod turned on a lathe to the right diameter bushing and embedding two SS threaded rods at either end. Undersized holes would be drilled at either end of the polyurethane bushing, the appropriate glue introduced and...
  16. Paulista

    Courses for Offshore Electrical Project and Design

    I found this one at Cranfield (UK) that "fitted like a glove" excepting that the same MAY only be offered again as late as May 2006: "In addition, the Research Group offers a series of extended professional development courses directed at the shipbuilding and offshore industries. These Key...
  17. Paulista

    Course for Offshore Electrical Project and Design

    I found this one at Cranfield (UK) that "fitted like a glove" excepting that the same MAY only be offered again as late as May 2006: "In addition, the Research Group offers a series of extended professional development courses directed at the shipbuilding and offshore industries. These Key...
  18. Paulista

    Courses for Offshore Electrical Project and Design

    I found this one at Cranfield (UK) that "fitted like a glove" excepting that the same MAY only be offered again as late as May 2006: "In addition, the Research Group offers a series of extended professional development courses directed at the shipbuilding and offshore industries. These Key...
  19. Paulista

    Why are most hybrids based on gasoline engines?

    SomptingGuy has a good point there. European car manufacturers are betting on the diesel. There is a whole array of frugal consumption, low-noise, high-speed plus impeccable emission diesel engines that are being offered as alternatives to petrol-engines on a great deal of car models. At...
  20. Paulista

    Can there be two solutions to steady state cooling

    Warpspeed, The book - only if I order it directly from Amazon etc. As for the formation of steam bubbles and the thermal runaway that ensues (positive feedback), I have witnessed it happen on my port diesel. Quite dramatic, specially if you are out on the water...

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