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  • Users: pmtoo
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  1. pmtoo

    My questions about camshaft design

    It has been related to me that Keith Duckworth had a saying. The only people who write about Jerk are Jerks. Not saying it is right or wrong, just saying.
  2. pmtoo

    Really need help wtih o-ring comp for engine application

    Has 250F been tested/verified as a trustworthy number? I normally work with air cooled two strokes, and .050" from the combustion chamber/cylinder near the head interface I am used to much higher temps. I would expect to see 200F at low load operation with forced air cooling and up to 400F (on...
  3. pmtoo

    Piston ring spacing - looking for information

    ivymike, Your description of my restraints is correct. It seems as though the area acts as a gas containment area to keep the high pressure differential on the top ring and as a piston to liner contact area in most designs. I feel as though I am safe in presenting the design to our piston...
  4. pmtoo

    heating intake air to improve mpg?

    I have preheated intake air to over 100°C in an exhaustive study of a single two-stroke. The result was a drastic decrease in fuel consumption, but it was a crude engine to begin with and all the heated air was doing was assisting in fuel evaporation and reducing pre-ignition droplet size (it...
  5. pmtoo

    Piston ring spacing - looking for information

    The piston, like all of our units, is for R&D purposes, not a production ready part. The new design we want to try out requires that a uninterrupted space of ~14mm is left about 12mm below the piston crown. Using "standard" diesel ring placement this will only allow for one ring, however, we...
  6. pmtoo

    Piston ring spacing - looking for information

    Thank you, those terms are coming up with a few items, it will take some time to narrow down what I need. For all intensive purposes the piston is a modern diesel engine piston (bore of ~80mm). I work in combustion, so the top of the piston is my area, but due to manufacturing constraints I...
  7. pmtoo

    Piston ring spacing - looking for information

    I am working on a project that involves a large gap (measured axially) between the top and middle (scraper) ring. The space between the two will most likely be over 14mm. The piston is of similar design to an automotive diesel engine. I am trying to find any resource describing the importance...
  8. pmtoo

    Valve Spring Power Consumption

    http://www.profblairandassociates.com/RET_Articles.html Blair wrote a series of articles for RET magazine that discuss valveing. In one of them calculating power losses is throughly explained.
  9. pmtoo

    Cam Lobe Design

    Gordon P. Blair has a few good articles in Race Engine Technology that are available as .pdf on his website. This is most likely more than you wanted to know, but it may answer some questions. http://www.profblairandassociates.com/RET_Articles.html

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