Engine Definition and 999 Threads

I know that the power of an engine is equal to (rpm*torque)/ 9.54 (SI units). But does this mean that an engine when turned on is outputting the same amount of energy per unit time, every time ? . What happens when we press the gas pedal, does the power output increases? When i drive my car...

I have an engine with the following specifications: 305 cc, 4-stroke single-cylinder. Torque : 18.53 N m @ 2800 rpm. Weight of the car 275kg Coefficient of drag:1.15 Frontal area: 0.9177m^2 Rolling resistance:0.04482 Engine wheel efficiency: 78% How can i calculate the Max. acceleration and...

We know that electric motors are very powerful(hp and torque) and efficient than all the combustion engines. There are lots of advantages of electric motors to be used to propel vehicles as you can have the same maximum torque at any speed, very high pickup, high top speed as well as no need of...

Hey friends, My college team takes part in college level racing events. They currently use a KTM 390 engine(race limit is 600). WIth the 20mm restrictor rule we can generate around 30-33hp after some tuning, after the restriction of course. Now we want more power. We need it. So we have 2...

Recently, I've been watching a lot of those youtube videos debunking gyroscopic propulsion because everything about it violates the second law of motion or something... This got me thinking, if I was floating in space and I decided to swing a large rock on a rope around me, to generate some...

No idea why this popped into my head on the drive home tonight, but here we go: Would it be possible to build a rocket filled with either liquid Nitrogen, or some other super-cooled substance, then use a battery of high-energy, ground-based laser beams pointed at the super-cooled propellant to...

Hello guys, I'm currently working on a car simulation just for fun, but I'm stuck... The force to move a car is generated by burning fuel ( to be more percise, diesel or gasolin). But there are more variables: Pressure (i know this because of turbos and such) amount of fuel amount of air (or...

How does start of injection effected by speed of the engine? According to data, it seems for higher engine speed, the SOI (in terms of degree BTC) is higher.

I've been reading a lot about rotary screw compressors and using them as expanders in ORC systems. There are about 3-4 companies making these for ORC systems and they seem to be very reliable and efficient. They are much more tough than turbines; they can take dry steam ,wet steam, saturated...

Lets say if i have a bell nozzle rocket engine such as this one : http://www.braeunig.us/space/pics/fig1-04.gif and inside the combustion chamber i have an average pressure of around 300 psi. If i wanted to feed in liquid fuel into it while the fuel pump is only able to supply 100 psi of fuel...

I need to design starter motor based on the the torque required to rotate the flywheel and reciprocating mass in the engine.How to do the calculation .I have already done a part,i feel something more to consider

i am working with a Honda Gx-35 engine (1.2kw and 1.9 N-m) for a project and wish to make a dynamometer to measure its torque and hp.Was wondering whether an electric motor or an alternator should suffice my needs? wont the voltage regulator in the alternator keep my o/p constant? please help

I've read that the total forward force on an engine is given by a change of momentum which is written as ##P = \mu_{fuel}v_{0} + \mu_{air}(v_{0}-v) ##, where ##\mu_{fuel}##, ##\mu_{air}##, ##v_{0}## and ##v## are respectively the rate of decrease of mass of the fuel being burnt, the rate which...

I can't realize the proving why Carnot engine has the highest efficiency. "Let εc be the efficiency of a Carnot engine operating between two given temperatures.If an engine X, which has an efficiency εx that is greater than εc.We can couple engine X to a Carnot refrigerator , and they make a...

Hello, is there a formula or technique to calculate the equivalent inertia of an engine? I think I will have to add up all the inertias of everything else rotating inside it but it has so many components like cams, followers, pulleys, water pump, crank, flywheel etc. What sort of effect will...

As a jet engine travels through the sky and picks up speed ram air increases the air pressure at the air intalk of the engine. How many mph does the engine have to be going for ram air to 2 atmospheres = 29.4 psi? At what speed in mph = 3 atmospheres? 4 atmospheres? Is this a linear or...

Question: is it possible to have any of the following - 1. Steam engine in a car 2. A steam internal combustion engine 3. A hydrogen internal combustion engine Background info Hi all, I am working on a fiction short story for fun. It is set in a parallel universe so history and a few...

**Long Post** 1. Homework Statement The Mazda MX5 (2001-2005) comes with two engine sizes, 1.6 litre and 1.8 litre which are rated as 110 bhp and 146 bhp respectively at 6,500 rpm. You are required to choose one of the two engine sizes and analyse the system with a view to improving the power...

Homework Statement A possible ideal-gas cycle operates as follows: (i) from an initial state (p1,V1), the gas is cooled at constant pressure to (p1,V2) (ii) the gas is heated at constant volume to (p2,V2) (iii) the gas expands adiabatically back to (p1,V1). Assuming constant heat capacities...

Hello everyone, I am quite new to Fluid dynamics, so I would like to ask for your help. Is it possible to calculate volumetric flow rate from the instantaneous pressure? We need to know the flow rate of the air entering the cylinder in the engine due to the suction pressure. It is required to...

Homework Statement You have an infinite heat reservoir with temperature Th. But you’ve only got a finite cool reservoir, with initial temperature Tc0 and heat capacity C. Find an expression for the maximum work you can extract if you operate an engine between these two reservoirs. Homework...

I'm currently studying Mechanical Engineering at Level 3 in the UK and I'm beginning my integrated masters in September. I've missed a large chunk of my studies this year due to a broken collarbone I sustained earlier in the year. Instead of getting any special dispensation I'm trying to work my...

I apologize if this is not the right forum to post a question like this... Would the use of a magnetic field(using magnetic levitation) to keep the parts separated, prevent the need for a lubricant, in and internal combustion hydrogen engine?? Also, how much voltage, and how many amps do you...

Hello. Do you think the idea of placing the jet engine at the front is plausible? Why? Why not? Thanks Yrjosmiel

Homework Statement a refrigerator is used to convert 1 kg of liquid water at 30 degree celsius to ice at -18 degree celsius.the refrigerator rejects heat to surroundings which are at 30 degree celsius.the specific heat values of liquid water and ice are 4.18 kj/kgk and 1.9 kj/kgk respectively...

How much power do the different engine systems require to operate? For example - HVAC System - 3kW Engine Cooling System - xxkW Transmission cooling system - xxkW Heated/Cooled seats - xxkW

Hi everyone! I am trying to make a presentation concerning up to date internal combustion engines for different applications (light duty/passenger cars, heavy duty, marine/low rpm, aviation etc). I don't need any charts just sheer numbers of power, capacity, weight, engine dimensions...

What does the P-V diagram for a cycle that violates the Kelvin Planck statement of the second law of thermodynamics look like? Would you say we cannot draw such a diagram BECAUSE of the second law?

Homework Statement Figure 2 represents a model for the thermodynamic cycle of the Stirling engine, patented by Scottish clergyman Robert Stirling in 1816. The engine operates by burning fuel externally to warm one of its two cylinders. A xed quantity of inert gas moves cyclically between the...

Homework Statement Figure 10.30 shows two disks: an engine flywheel (A) and a clutch plate (B) attached to a transmission shaft. Their moments of inertia are and initially IA and IB, they are rotating with constant angular speeds ωA and ωB, respectively. We push the disks together with forces...

Homework Statement Hi, I'm a new user and got this problem. Sorry to bother, but I couldn't find any relevant information from my Physics books.. The problem states: Build a heat engine using these processes: adiabatic, isothermal, isochoric and isothermal. The work-cycle of the engine must...

hello we know that there is 42% limitation in the efficiency of internal combustion engine, thermodynamically calculated by Carnot and we can never overcome this can someone explain me in few simple words why this is true? also, does this apply to the energy from internal combustion to...

It has been some time since I sat through basic aircraft dynamics, so I hope to check some conclusions about the topic. Clearly rockets and missiles have maintained stable flight via gimble of the engines. My understanding has been that designing, say, jet aircraft in this way (i.e. forgoing...

can anyone suggest me the sites where i can find the methods to improve the efficiency of IC engines?

Would it be possible to build an engine that runs primarily off a petrol but has a steam engine that captures all the heat lost from the combustion (70%) and applies it towards powering the engine? Looking for ideas, opinions and attitudes on whether or not it is a practical idea.

Hi, I am working on investigating an idea I proposed regarding a ramjet that operates in subsonic flow (of a fixed speed) with a convergent intake. That utilizes the pressure immediately behind a standing shock-wave for compression. I have posted a link to my initial report here and I now need...

Hi there, i am currently working in an airline industry but unfortunately do not have enough facilities to carry out my research on the HPT Blades and its cooling holes of an Engine. Would anybody help me on this matter? Thanks

Homework Statement During the power stroke in a four-stroke automobile engine, the piston is forced down as the mixture of combustion products and air undergoes an adiabatic expansion. Assume (1) the engine is running at 3400 cycles/min; (2) the gauge pressure immediately before the expansion...

I'm having a hard time setting up an equation for a heat engine problem with one heat source and two heat sinks given only the temperature of the heat source and temperature of the two heat sinks as: TH = 1000 K TC1 = 200 K TC2 = 300 K It is given that the two heat rejected are of equal value...

Dear Friends, Hi Everyone. I am Planning to Design a Special Engine. I got with an Idea but got Struck on Starting the Design. I do think many has the Same Problem "Starting Trouble". Could someone tell me where to Start the Engine Design? Please...

I am teaching myself thermodynamics (and really enjoying it!) but am slightly confused about Carnot's engine. From the equation efficiency=1-T(cold reservoir)/T(hot reservoir), I see that the most efficient engine is one where the difference in temperature between the cold and hot reservoirs is...

I ran across several YouTubes that claim, and apparently demonstrate, that you can clean carbon deposits from a car engine by simply spraying or pouring (very slowly) water into the intake when the engine is fully warmed and running. I've never heard this from a reliable source and my...

Is Carnot engine the only form of reversible engine? Is it possible to have a different form of reversible engine that goes through different processes? For a standard Otto cycle working with ideal gas, theoretically the two processes involving isochoric pressure change can be reversible...

So I read that in a motoring test (to test the engine power), the engine is run to the desired speed by its own power. The power is absorbed by an electric dynamometer. Then, the fuel supply is cut-off and the dynamometer is converted to work as a motor to drive the engine at the same speed...

So, my proposition is this: (Note that this is a purely theoretical project, and no models/experiments are necessary.) When a car moves forward, wind moves backward, right (relatively). So if we were to attach a small, retractable wind turbine to the side, connect it to the alternator, we could...

Hi , Everyone… one very general question regarding ic engine is suppose our vehical (Ic engine) Is at rest ,and we are ready to start vehical , when we kicked the kick By our legs then there is compression stroke..,right?, then when air fuel mixture is sucked in cylinder ( When there is...

Homework Statement A cylinder in a truck engine are shown in Figure Q8.1 below. The piston slides without friction in the cylinder of diameter 150 mm. The combustion chamber is subjected to an internal pressure of 50 bar gauge as a result of fuel combustion without any leakage past the piston...

Recently there has been much discussion about an EM rocket engine China has built which clams to give propulsion without ejecting mass, violating Newtons conservation of momentum. Does Einsteins General relativity equations require conservation of momentum? Does this claim violate General or...

I am a trucker. I drive a Freightliner Cascadia semi-truck. My cell phone charger will charge my cellphone with the engine turned off on my semi-truck. But the same charger will not charge up my cellphone in my car when my car's engine is turned off. Why will my charger charge up a...

As seen in Gravity, and also in this youtube video: , the Soyuz main engine is covered by a metal plate that it mechanically moved out of the way before firing. What is the function of this covering?