Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: Mark944turbo
  • Order by date
  1. Mark944turbo

    What is wrong with my instnataneous torque formulas?

    I thought I had these formulas working and I messed around and lost it If work per cycle = integral of Pressure * dVolume, the most instantaneous work should get done where piston velocity is highest, because dV will be biggest, if you assume constant pressure. So doing that out, my engine...
  2. Mark944turbo

    effect of resistance to tuning

    I am curious about the effect that being in a higher gear, or driving up a hill, has on tuning fuel and timing. Obviously when you spend more time at high load the detonation threshold is lowered and temps increase, but what is the effect of the piston having more resistance to acceleration...
  3. Mark944turbo

    One point of forced induction/NA SI engine comparison

    By saying "Let's say we have a defined RPM and a given amount (mass) of air for every stroke" I ment we have a defined (constant) mass of air induced every stroke. Sorry for missunderstanding.
  4. Mark944turbo

    One point of forced induction/NA SI engine comparison

    Hydroformer, I've specified the air mass does not change :) . So after having cooled the air, would we be able to redesign the engine in order to get more torque from the same air mass ? We probably would, by pushing farther the knock limit (at WOT). But we don't have dry ice. In a forced...
  5. Mark944turbo

    One point of forced induction/NA SI engine comparison

    franzh: You say: "If you take the basic engine displacement, air density/mass, and RPM, with the calorific value of the fuel, you can calculate the raw net power output. The rest of the infinite number of variables are refinements." And then: "Change the CR and the net power changes, along with...
  6. Mark944turbo

    One point of forced induction/NA SI engine comparison

    hydroformer: I saw. I see what it's intended for, but how is it related to my question ?
  7. Mark944turbo

    One point of forced induction/NA SI engine comparison

    franzh: I don't think parameters I set are enough to calculate the engine output. Engines could be knock limited, have different mixture temperature at ignition, ... schmidtj86: yes, torque is more than just pressure. Let's say in both cases engines would be designed to fully exploit the...
  8. Mark944turbo

    One point of forced induction/NA SI engine comparison

    Hi, I'm looking at one of aspects of SI NA/forced induction engines. Let's say we have a defined RPM and a given amount (mass) of air for every stroke, any AFR, any engine design, WOT and optimal ignition timing (max torque or knock limited). I wonder if a forced induction engine could produce...
  9. Mark944turbo

    Combustion Pressure sensors

    The cheapest setup from TFX comes to about 4 grand including sensors and logging equipment, which is in my budget. I definately want the spark plug mounted model. I am going to bring up these points about accuracy, calibration, overheating, etc with the company, and see what they have to say...
  10. Mark944turbo

    Combustion Pressure sensors

    Thanks for the replies. Bob, can you give me a ballpark on what price you are paying and for what things you are getting? I have sent them an email, but I thought I would ask here too in case I get a faster response. I really like the user interface of the tfx logging software.
  11. Mark944turbo

    Combustion Pressure sensors

    Is there a website out there that actually lists these things for sale? Preferably with prices? I am looking into these as an aid in my engine building/dyno service business. Any help or info is appretiated. I know they are expensive. Thanks
  12. Mark944turbo

    backpressure backpressure

    I remember seeing a formula once that used a bunch of variables to output a maximum backpressure/map ratio, that is, the ratio that if exceeded the motor will start making less torque. At least I think I remember this. Does anyone have this equation or know if it exists? I ask because on a...
  13. Mark944turbo

    Editing Bosch Motronic ECU Eproms

    I am trying to figure out the code in my Porsche 944 turbo's eproms. I want to edit things like the rev-limiter, fuel maps, ignition maps, and overboost protection. If anyone here could give me ANY useful information I would appretiate it. Information on this subject seems hard to come by! Mark

Part and Inventory Search

Back
Top