Diesel Definition and 147 Threads

  1. J

    Exploring the Limitations of Standard Diesel Engines

    this is thing I'm thinking about for few years. why standard passenger car diesel engines are so limited in engine capacities range? if we take petrol engines, there are anything from 1.0 liter to 3.0l Inline 4 cylinders, 2.0-4.0l 6 cylinders (or even bigger in USA), 4-7l V8 etc. but take...
  2. A

    Exploring Diesel Engine Friction and Fuel Mass Flow Rate

    Hi I have been plotting a Willans line, (engine power against fuel mass flow rate) and I noticed that the line is fairly linear up to about 75% and then it starts to increase a bit more dramatically. So I was wondering how does engine power at a fixed RPM effect fuel mass flow rate? Is...
  3. S

    Why does heat addition happen at constant pressure in diesel cycle ?

    Why does heat addition happen at constant pressure in diesel cycle ? what is the basic concept behind it?? please do enlighten me on this topic. thanks in advance
  4. marellasunny

    Percentage of non-ideal combustion is more in a diesel engine,why?

    In this diagram,non-ideal combustion in a diesel engine takes-up a lot of the fuel energy. Why is this so? Also intrigues me that there is a lot more non-ideal combustion at low load than higher loads. Is this because the diesel engine operates with a lower compression ratio at lower loads? This...
  5. MacLaddy

    Thermal Efficiency in an Ideal Diesel cycle.

    Homework Statement Helium in an ideal Diesel cycle is compressed from 4 L to 0.25 L, and then it expands during the constant pressure heat addition process to 0.50 L. Under air standard conditions, the thermal efficiency of this cycle is: a) 79.5% b) 20.5% c) 61.4% d) 67.4% e) 84.3%...
  6. S

    Modelling Diesel Cycle in Excel.

    Homework Statement Construct a Microsoft Excel® spreadsheet that models an internal combustion engine based on the ideal air-standard Diesel cycle. Given the minimum temperature (##T_1##) and pressure (##P_1##) in the cycle, the engine size (##V_1##), the compression ratio (##r_v##), the...
  7. K

    Why do diesel engines produce less power than gasoline engines?

    Hello all; I have been thinking about this for some time and searching through the internet for it but couldn't get a satisfactory answer for it, so i decided to ask this to you. Here is my question: If diesel fuel has more energy in it than gasoline does and if diesel engines are more...
  8. R

    Question about acceleration regarding Diesel vs. Gas

    I've read on many sites that diesel cars usually accelerate slower than gas cars. Why is that though? Diesel engines reach higher torque and at lower RPMs so why is it that gas cars accelerate faster? Are diesel cars just a lot heavier or something?
  9. G

    Physics of a diesel engine revving up and slowing down

    Hi everyone. So I am trying to write a very simple engine simulator for a game, and I have a question about how diesel engines accelerate and decelerate when a machine is in neutral. I have found some videos of a machine at full throttle and then the throttle released, and the engines...
  10. R

    How is the torque curve of a gasoline engine different from a diesel?

    Hi, my lecturer has given us two graphs showing the general shapes of the max torque curves for both gasoline and diesel engines, and they clearly show that the diesel engine has a much flatter torque curve than the gasoline engine, but not explained why. Expected to find this information...
  11. E

    Cheap and low power diesel engines

    what is the cheapest and low power diesel engine available at present? i am seeking 3 KW engine with of minimum weight available for my college project.
  12. X

    How Is the Efficiency of the Diesel Cycle Derived Using Compression Ratios?

    Homework Statement Derive a formula for the efficiency of the Diesel cycle, in terms of the compression ratio V1/V2 Homework Equations e=\frac{W}{Q_{h}} w= ∫pdV The Attempt at a Solution Now I know I should have used e=1-\frac{Q_{c}}{Q_{h}} to get it but he said it is...
  13. A

    AZINGLY, for the Joule cycle there is no heat flow at all, so it is 1-0 = 1.

    Diesel, Otto , Joule TRICK? Hi Guys, I try to callculate the efficiency for a cycle Process. For Diesel, Otto and Joule Processes you can write the efficiency as a really small equation. I have seen that for example sometimes the adiabatic equation is used, but i don't understand in which...
  14. M

    How Can Beryllium Help Lighten Diesel Piston Weight?

    I'm looking to design a range of diesel engines for use in road cars (for when i win the euro millions ;) , consisting of a flat 4, straight 6 and v8. all with a cylinder capacity of 666cc (per cylinder). As we know the biggest downfall of diesel engines is the weight, especially that of the...
  15. Low-Q

    80% ethanol mixed with 20% diesel

    Would this mixdure be equivalent in performance and fuel economy as 95 octane gasoline? Any possible damages to the engine if I try this mixdure? Br. Vidar
  16. I

    Calculating Exhaust Flow for Diesel Engines

    Is there a way you can calculate exhaust flow using intake flow and exhaust temp? Maybe I would need fuel quantity as well. I just need a rough idea.. It's for on a diesel.
  17. I

    How Do Compression Ratio and Boost Pressure Affect Diesel Engine Performance?

    I have been searching for hours and have conflicting data. Basically if engine A has 18:1 CR and 0psi boost and engine B has 13:1 CR and 8.5psi boost, the pressure at TDC-Compression is the same or rather the "effective CR" is the same. However, engine A is 16.7% hotter at TDC but has 43.7%...
  18. E

    Automotive Why Diesel Engines Produce Less CO2: A Thermodynamic Approach

    As the title says, why diesel engines produce less CO2 than gasoline engines and how is this related to the more torque and less power in diesel engines? PLEASE only a fluid dynamics or thermodynamics approach. Spent hours on searching to find why petrol engines produce more CO2 emissions...
  19. C

    Deriving Efficiency of a Diesel Engine Formula

    Homework Statement The Diesel cycle is an idealized representation of the process that occurs in a Diesel combustion engine, as shown in the graph below. Starting at point a, the Diesel cycle consists of an adiabatic compression, an isobaric expansion, and adiabatic expansion and an isochoric...
  20. U

    Diesel-Electric vs. Diesel: Which is More Efficient for Train Propulsion?

    Hi all. I was wondering what benefits one gains by using a diesel-electric transmission over a simple diesel transmission (such as in locomotives, which now often use diesel-electric transmission). Is there not a loss in energy as one convert mechanicals power to electric power? Why not use...
  21. J

    Automotive Can a diesel engine run on gasoline?

    I haven't read or heard about anywhere, but is it possible to run a diesel engine on gasoline/petrol?
  22. C

    Is this the reason diesel engines are less powerfull?

    Im studdying PV diagrams for dieslel and petrol engines, and I've noticed that for Diesel the fuel is combusted at constant pressure as opposed to petrol (gasoline) which is at constant volume. I know that the area inbetween the lines is the net work done by the engine. So if you look at the...
  23. N

    Calculating Efficiency of Diesel Cycle

    1. Homework Statement given: diesel cycle, P1V1 P2V2 P3V3 P4V4 - all known T1 = 20°c specific heat capacity constant pressure = 1000j/kgk specific gas constant = 287j/kgk compression index = 1.4 2. Homework Equations heres where i am stuck! 3. The Attempt at a Solution Hi...
  24. N

    Calculating diesel cycle efficiency

    Homework Statement given: diesel cycle, P1V1 P2V2 P3V3 P4V4 - all known T1 = 20°c specific heat capacity constant pressure = 1000j/kgk specific gas constant = 287j/kgk compression index = 1.4 Homework Equations heres where i am stuck! The Attempt at a Solution Hi all, I am...
  25. M

    Automotive Plotting Pressure vs Crankangle Diagram for 4-Cylinder Diesel Engine

    I want to plot a cylinder pressure vs crankangle diagram for a 4 cylinder naturally aspirated diesle engine ,do I require AVL boost for this ?and how can you plot it manually?
  26. T

    Automotive Diesel ICE with EGR injection timing change

    Hello, I'm currently doing research into the various effects of exhaust gas recirculation for my dissertation at university, the engine being tested on is a naturally aspirated 4 stroke diesel Ford straight 4 (probably out of a transit or something of the sort). Last week I recorded cylinder...
  27. L

    Diesel Emergency Generator Amp Load

    Hi there! I have here a CAT Standby 650 ekW 813 kVA 60 Hz 1800 rpm 480 Volts generator with CAT 3412C TA Diesel Engine. Im trying to come up with maximum apm load which can be connected to this generator. What formula should I use for that? simple one W=V*A, where A=W/V good enought? Or...
  28. L

    Can gasoline engines run on diesel fuel and vice versa?

    what will happen if we put petrol in a diesel engine and diesel in a petrol engine? i think it will not work but why will it not work
  29. A

    Higher efficiency - 2 stroke or 4 stroke diesel engine?

    Hi evry1! Just wanted to know that which has got higher efficiency - 2 stroke diesel engine or 4 stroke diesel engine. I believe that direct injection of fuel in diesel engines prevents the loss of unburnt fuel in exhust of 2S engine. And simpler mechanism and lesser no. of moving parts in 2S...
  30. T

    Is Diesel Spillage on Car Tires Dangerous?

    Before I started putting it in the reservoir, some fuel came out to the exterior part of the reservoir, and some of it even spilled on the door and the tire. And that tire is flat, because it loses the pressure in some days, so maybe some diesel fuel even went inside it. Is it dangerous to leave...
  31. P

    Diesel Engine Problem - Find total work

    Homework Statement The problem is in the attached document Homework Equations attached in pdf document The Attempt at a Solution 1->2 adiabatic compression T2=(V2/V1)^1-(Cp/Cv) = 987.7K w1=nCvdT = (1mol)((3/2)*8.314J/molK)(987.7K-298K) = 8601.3 J 2->3 w2=-PdV=-Pmax(V3-V2)...
  32. I

    Adiabatic process - Diesel engine

    Homework Statement A diesel engine requires no spark plug. The air in a cylinder is compressed so highly that the fuel spontaneously ignites when sprayed into cylinder. If the air is initially at 20°C and is then compressed by a factor of 15 in volume, what final temperature is attained...
  33. W

    What is the Chemical Formula of Diesel?

    Homework Statement For a assessment task at school, I have to compare various types of fuel, one of which is diesel. One aspect of the task is to name the chemical formula for each fuel. The Attempt at a Solution I keep finding that the formula for diesel is C12H23. I know that diesel is...
  34. C

    Exhaust air flow parameters for car engines (otto & diesel cycles)?

    Does anyone know any sources (i.e. car manufacturers) that provide the exhaust air flow parameters for the some specific car engines? I need stats on various otto & diesel cycle engines (small compact car engines, large semi truck engines, etc.). When I say exhaust air flow parameters, I need to...
  35. Evo

    Making diesel with sun, water, CO2

    It will be interesting to see if anything comes out of this. Sounds too good to be true. Continued... http://news.yahoo.com/s/ap/20110227/ap_on_bi_ge/us_growing_fuel
  36. D

    How to prevent diesel fuel from gelling at low temperatures?

    Low Temperature Diesel Fuel (urgent) I'm having a problem with diesel fuel at the moment and would greatly appreciate insight into the subject. I'm currently stranded in Colorado where it's somewhere like -10 degrees (F) and our diesel truck isn't starting. I've narrowed down the problem to...
  37. M

    Is the CRDi System's Mechanical Pressure Control Valve Limited to 10 Uses?

    i recently saw the CRDi system ,its working and its performance test.Now there is a particular mechanical pressure control valve being used in the rail to prevent excess pressure,this valve works each time pressure goes beyond the limit and brings it down,but it is said that this happens only...
  38. J

    Engine Cycles: Otto, Diesel and Carnot

    Problem / Question 1)Study the engine cycles for the Otto cycle, Diesel cycle, the Carnot cycle and the standard air cycle. Explain the principles of how they work why they are different and the benefits and disadvantages of each of the systems. I have wrote about the otto cycle...
  39. M

    Specific Heat Capacity of Diesel Liquid & Gas - J/kgK

    I am doing a heat exchanger report for a domestic boiler, and would anyone know what the specific heat capacity for diesel in its liquid and gas(having been combusted) state. In J/kgK please thanks
  40. U

    Heat radiated from an diesel Engine

    Can anybody help me how to calculate the quantity of heat radiated from an diesl engine. any formula based on BHP? what are the assumptions that i need to make? what are the factors that i need to consider whilem calculating the heat radiated from an diesel engine
  41. N

    How Can I Enhance Efficiency of a 1.6L IDI Diesel with Custom Swirl Chambers?

    I am VERY interested in IDI diesel engines and the upper limits of their efficiency range. I used to post on vwdiesel.net but the site is down now. I was looking into increasing the efficiency of the 1.6l turbo diesel engine by making a new"er" head made from a preexisting aluminum one out of...
  42. J

    [Thermodynamics] Quick question about ''Cut-off ratio'' in the Diesel Cycle.

    [SOLVED] Quick question about ''Cut-off ratio'' in the Diesel Cycle. So I've been studying the Diesel Cycle, and I've come up with something called the ''cut-off ratio'', which is simply a name for the ratio of expansion r_E. But I'm getting different definitions for this ratio. For example...
  43. J

    The temperature of the compressed air in a diesel engine

    Hi, Could someone tell me the rough temperature the air gets to under compression, just prior to the diesel being injected and auto igniting? thanks in advance
  44. W

    Diesel Engine Prob: Formula for Temp at Stages 3 & 4

    how would you find the correct formula for the temp at state 3 and 4. i found it for 1 and 2
  45. B

    Diesel internal combustion engine converted to hydrogen?

    Okay, so I've found this site (http://www.spiritofmaat.com/archive/feb2/carplans_doc.htm) and it claims to have a reliable method to convert a diesel engine to run off of hydrogen. Now, my question is is this actually feasible in the method they've described? I've asked two other sources and so...
  46. J

    Diesel Stop Solenoids: Finding the Right Fit

    I am designing a stop system for a old diesel engine. The application I am using needs a pull type solenoid that can have a stroke of 9/16" - 1 1/2". it needs to have a return spring of at least 20 lbs. It needs to be continuous duty ( probably 2 coil).This will be used as a "engage to run"...
  47. F

    Is a High Horsepower, Lightweight Diesel Engine Possible for a Race Truck?

    Hey, I am working on a project and yahoo answers hasn't been much help. I am building a light weight race truck and I was hoping someone in here had heard of a high horse power diesel engine that wasn't heavier then the rest of the truck :)
  48. V

    How Is Diesel Engine Efficiency Calculated Using Compression and Cutoff Ratios?

    Homework Statement The diagram below shows the thermodynamic cycle of a diesel engine. The compression ratio is the ratio of maximum to minimum volume; r=\frac{V_{1}}{V_{2}}. In addition, the so-called cutoff ratio is defined by r_{c} = \frac{V_{3}}{V_{2}}. Find an expression for the...
  49. S

    Was the Diesel Fuel Glowing in the Snow?

    I had some diesel fuel outside and it was snowing pretty good and it looked like it was glowing bright green/yellow against the white background. Was it glowing or was it just an illusion?
  50. S

    Gas in a 748mL cylinder of a diesel engine has a pressure of 1.72 atm

    The gas in a 748mL cylinder of a diesel engine has a pressure of 1.72 atm at 306K. What will be the volume of the gas when the piston compresses it to 46.5 atm and 777K?
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