Engine Definition and 999 Threads

. About a car internal combustion engine. Lets suppose the engine torque is maximum at 3500 RPMs when the engine gets also its maximum load, let's say, a 90%. This kind of data is usually shown at WOT. My question is: if the throttle is not wide open, but half open, allowing the cylinders...

With all the weight either recipricating or rotational flying around I suppose a basic conversation should be brought up when analyzing engine operation and trying to reduce power losses, rpm limiting effects.

hi. can someone help on this.. in a two wheeler automobile engine, What does a damper inside the clutch and magneto cover do... it is a rubber stripe fastened to the wall of covers..

I want to design a RC helicopter powered by a gas engine. The total mass to be lifted by the helicopter is 25 to 30 Kg. What is the engine power or engine size (in cc) required to lift the helicopter? Can someone please provide me some calculation? Regards

Homework Statement A Mechanics tries to remove an engine from a car by attaching a chain to it from a point directly overhead and then pulling sideways with a horizontal force F. If the engine has mass 180kg, what is the tension in the chain when it makes an angle of 15 degrees with vertical...

My new Civic recommends 0w 20, however it is a bit more expensive, especially if done at a dealership. Is there much difference between 0w 20 and 5w 20? I heard the only reason Honda uses 0w 20 is to meet the MPG guidelines.

"engine and control systems" vs "powertrain" I am interested in working for a person in charge of "powertrains" on cars, and I have an interview for a co-op opportunity to work with someone in charge of aviation "engine and control systems" how much would these things overlap? i guess both...

I want to use 2 radiators instead of a single radiator for cooling a maruti suzuki 800cc engine. The reason? we are participating in SUPRASAE 2012 and our space for the radiator is limited(we can't accommodate the 300*335 mm radiators but we can accommodate two radiators within 200*300 mm). Can...

Homework Statement Fifty kg of water at 0oC must be frozen into ice in a refrigerator. The room temperature is 20oC. The latent heat of fusion of water is 3.33x105 J kg-1. What is the minimum power required if the freezing is to take place in one hour? m = 50 kg Lf = 3.33x105 J kg-1...

Imagine you had a torodial tank filled with a (super)conductive fluid that was flowing around the tank in a clock-wise direction. Could the minute differences in speeds between the liquid flowing on the inside of the torus and those on the outside -slowed due to friction - create an electric...

Homework Statement A 1600 kg jet engine is fastened to the fuselage of a passenger jet by just three bolts (this is the usual practice). Assume that each bolt supports one-third of the load. (a) Calculate the force on each bolt as the plane waits in line for clearance to take off. (b) During...

Hey Guys, I'm fairly new to this forum. I would just like to know is their a way to allow for a four cylinder engine to produce for more engine gas to spin 2 turbos. As I researched on forced induction, I've found that Twin turbos on a four cylinder might be one turbo too many, though I...

Homework Statement A rocket engine has an exhaust velocity of 20,000 m/sec. The mass flow (dm/dt) rate is 1 milligram per second. a) What is the thrust produced by the engine? b) The engine propels a 200 kg space craft. What change in velocity is achievable by running the engine...

Hi As a school project, I want to construct a Stirling engine (particularly this kind : http://monsterguide.net/how-to-build-a-stirling-engine ). The execution is quite simple, but I do not fully understand the theoretical background. Can someone give me an explanation?

If a hypersonic jet (Mach 10) were to experience sudden engine failure at high altitude what would happen? Would it continue traveling forward, slowly decelerating and descending, thereby giving the pilot chance to attempt a controlled engine restart? Or would the jet experience catastrophic...

I do not really understand the reason why Carnot ideal engine needs 4 cycles: isothermal expansion, adiabatic expansion, isothermal compression, adiabatic compression. Why cannot use only 2 cycles said isobaric expansion and isobaric compression, i.e. use a heat reservoir to expand the air...

hey guys , i really need your help :) this my calculations on toyota prius model and when i calculate the IC engine power i found it equal 162.1 kw when i open Toyota Prius Specifications i found it equal only 73 kw i don't know where is the problem please help me :confused...

We have a single cylinder 500 cc petrol bike engine. It's maximum power output is 27bhp( max) and the max rpm of the engine is 5000 rpm. We need to tune the engine to MAP it accordingly. We are thinking to use a generator to convert the mechanical power into electrical power. I need help on...

How does a flywheel reduce torque fluctuations in a IC engine? Of course the more inertia you have, the less rotational speed fluctuation you get. But how does more inertia lead to less 'torque' fluctuation?

mechanical engineers i looked at wikipedia article http://en.wikipedia.org/wiki/Ford_385_engine they don't quite answer the question. the one you'd ask if you saw this engine at a machine shop or car show. what's going on with those valve covers/heads? Have A Nice Day!

Hi, I have a lawn mower engine and I need to read and adjust its rpm precisely. I am totally lost. I would like to ask how some of you would approach this problem. What I have right now is I am going to buy an Arduino circuit board controller. Then I am going to attach a tachometer onto...

Hello, My name is Jason, I am a senior high school student (new at using Physics forums), and am currently looking into alternative fuels, specifically a substitute for the popular leaded aviation fuel in use today, 100LL. 100LL contains lead to prevent engine knocking, (pre-detonation of...

Homework Statement Modern nuclear power plants have an overall efficiency of about 30%. Fossil fuel plants achieve overall efficiencies of 40%. Compare the rate of heat emission from a nuclear plant with that from a fossil fuel plant each of which produces an output power of 1000 MW...

Hi, my first post. So brief presentation, I'm an undergraduate mechanical engineer student. I hope this doesn't actually fall in homework, but it's a project that I have this semester: a steam engine car (small). I've made a bit of research and I ended up discovering the following "engine"...

Hi! I have to do cartesian mesh of 3d object. I have to do this in Matlab. It will be a part of FEM programme. I've read sth about Delanuay triangulation etc, but I have to do really simple disretization sth like in http://en.wikipedia.org/wiki/Regular_grid (Example of a Cartesian grid.)...

Assuming you have a uniform expansion of gasses upon their ignition from the top most piston position to the bottom, would the force generated on the crankshaft vary at different points in the down cycle? My logic tells me that when you are in the top most part of the cycle, you would have a...

just a query about last part of a question. a mass m hangs at end of light string and is raised vertically by an engine working at a constant rate kmg.at t=o,velocity =0 x=0 and x is measured in upwards direction. now i have shown increase in total energy of the mass, when moved up a...

Does anyone know where to get an engine deck for a pt6a. I know a lot of that information is proprietary but i need one nevertheless. For those of you who don't know what an engine deck is. It gives you thrust specific fuel consumption and power lapse (thrust lapse is for a turbojet and a pt6a...

I haven't been able to find anything on this topic and maybe it's because the wear is insignificant but I would still like to know, no matter how insignificant the wear, which scenario wears the engine less. This is on a diesel engine.. On a 0F day, 3 identical diesels start up at the same...

Homework Statement A 2175 kg test plane has an engine that can deliver a maximum power of 5.28×105 watts. The pilot hits the throttle when the plane is flying at 46.8 m/s and maintains maximum power for 6.5 seconds. What is the plane's initial kinetic energy? What is the plane's change in...

Hi I just wanted to know what is the mass (in kilogram) of an average car and the mass of an average engine. This is for my project and I want to know their masses to make a scaled model of a car for my experiment.

Homework Statement A borehole produces 120kg/s of high pressure water at 165°C. A powerplant is to be designed to extract heat from the water, reducing the temp to 147°C. The plant which will initially be assumed to be reversible, will reject heat at 17°C to a river. Take 147°C as the highest...

Using a series of focal reflectors, built in antenna strategically placed for proper phasing the EMF amplification system. Kinda like a space hyper engine. Possible? I can draw some blueprints I think.

Hello, I am a new user here but have found links to this site in many of my Google quests so I thought this may be the place to start a more focused search for information. I am doing a project with my son, we have created some spinning discs using magnets as a power source. I am...

We all know the constant volume combustion engine acts as a kind of internal combustion engine that is used in the car and truck extremely widely. The cycle is called Otto cycle. I also heard the constant volume combustion gas turbine engine was proposed many years ago and developed a few ones...

I will look at two different engines, which need heater, and no cooler, to operate. First one: A rocket engine, which, instead of burning fuel, simply heats up cold fuel in solid form so the heated and evaporated substance is used as a reaction mass. The nozzle of the rocket engine is in...

There are following problems associated with free piston engines (generators). Do you know if there exist some ways to overcome it? 1)Free piston engine burns oil.What could be done to reuse oil similar to four-stroke engine? 2)Free piston engine produces very short explosions which are...

Homework Statement A solid drive shaft is connected to an engine by a coupling, which has drive pins located on a pitch circle diameter of 80 mm (Note: the diameter of the pitch circle is greater than the diameter of the drive shaft). If the maximum power output of the engine is 90kW at 5000...

i want to model air flow in the inlet manifold using CFD ,how do i predict how flow variations and other parameters affect engine performance ? i know how it affects but how do i show it virtually

I am designing a car engine water pump and I want to know where i can find the standards of engine components that i can relay on. I mean what safety factors of stresses ,pressures temps and so on need to be accounted for.

Inexpensive V8 Mid Engine Transaxle if any of you want to build a 200 MPH sports car in your spare time take a small block chevy engine + powerglide transmission ( their short ) + a coupler ( connects trans right to rear end, no driveshaft ) + Corvette IRS 3rd member ( their cheap now, old...

Is there any equation for calculating the maximum power possible for a given 4 stroke engine? per cylinder. I guess it would involve: Octain rating of fuel used RPM CC some factor of bore X Stroke And an efficiency of 100%!

Homework Statement An engine operates with n = 1.94 moles of a monatomic ideal gas as its working substance, starting at volume VA = 21.4 L and pressure PA = 2.77 atm. The cycle consists of: - A to B: an isobaric expansion until its volume is VB = 50.1 L - B to C: an isochoric (constant...

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...

Homework Statement A reversible engine contains 0.5 mol of an ideal monatomic gas and operates using a cycle, similar to that shown in Fig. 19.21 on page 324 of the textbook, consisting of constant volume and constant pressure segments. (You will need to draw your own diagram using the data...

Homework Statement The question is presented as picture. Homework Equations What is the expression of this 'heat capacity C'? The x-process is isothermal then C=nCΔT=0? Please give me some ideas. The Attempt at a Solution set V1=V2, V3=V4, T1=T4, T2=T3, p1+p0=p2, p3-p0=p4...

I’ve recently become fascinated by high power density energy conversion devices… I was looking at the 100W incandescent light bulb lamp on my desk as 90% of its energy was being wasted as heat and started thinking… I know it is only a rather small amount of energy, but what would be the most...

Homework Statement A 52-kg mountain climber, starting from rest, climbs a vertical distance of 730 m. At the top, she is again at rest. In the process, her body generates 4.1 × 10^10 J of energy via metabolic processes. In fact, her body acts like a heat engine, the efficiency of which is...

Homework Statement A Carnot engine is operated as a refrigerator, taking in 18 J of heat every second and expelling 20 J into a 23oC room. What is the temperature inside the refrigerator? a. 15.4oC b. 3.33oC c. -6.62 oC d. -15.4 oC Homework Equations e=1-T(cold)/T(hot) U=Q-W...

Hi, I'm new here and I'm really hoping that someone could answer my question. i am trying to design a PDE but the problem about this is that the temperature caused by detonation (3461 K) is so high that it is really difficult to find a suitable material for the detonation chamber and thermal...