Engine Definition and 999 Threads

I am not talking about just ICE, but any thing that converts matter to energy.

Homework Statement [PLAIN]http://img15.imageshack.us/img15/7379/unledtzc.png (The rods are of length L, there is no friction, massless rods, yadee yadee yada) At a certain angular speed \omega, the counterweight performs uniform circular motion. Show that \omega and \theta are related as...

I wanted to know that what exactly is Knocking in an engine cylinder. I know it's a kind of a fault. But how and whole process leading to it is, what i want to know. Any reply will be well appreciated. :D Yash

This is my first posting with the forum and I hope I have chosen the appropriate topic. I am a 25 year automotive technician and have been pursuing an alternative application for the automotive industry. It is the electromagnetic pulse engine, which basically utilizes a regular 4 cylinder...

The theorized Alcubierre engine is purported to be capable of transporting a ship faster than the speed of light. I'm aware of the theory's problems associated with how much energy would be required to operate such an engine. This isn't my question. Apparently gravity waves, waves in the...

Is it possible for engines to be completely balanced?well I recently saw an engine manufacturing facility where crankshafts were machined , balanced and then assembled ,hence when the engine finally comes out can it be called a completely balanced engine?

hello! My first post here. I am by no means a mechanical engineer as I studied computer science in college. My question has to do with adding what is known as a cold air intake onto my vehicle. The design of the intake is such that the pipe fits at the throttle body via a silicone/rubber...

this is a small pulsejet designed by me..it produces around 2pounds thrust..This is the cheapest pulsejet engine you could make it costs around Rs.50..i will post the video tomorrow because i forgot to take my cellphone with me..But here is the engine pictures. here is the plan.. here is the...

I'd like to first say that I'm not really sure which forum this is supposed to belong in. This one seems to fit best, but my question may be better in one of the math/physics forums... I'm planning on going through the resources Chris Hecker recommends in his article Physics References...

This occurred to me when I first heard of the Space Time Frame Drag effect, which was confirmed by the results of Gravity Probe B (GP-B). http://science.nasa.gov/science-news/science-at-nasa/2011/04may_epic/" I am not a scientist or a mathematician, so I turn to my fellow humans who are. Do...

I’ve been searching high and low for an answer to this question. What actually HAPPENS if two engines were to power one drive shaft? I heard back in the days that cars were built this way to break speed records, and I heard present day it is used in tractors, but what increase. My question...

Using the TRITON engine, assuming it worked, starting from low Earth orbit about how long would it take to get to mars?EDIT: The Triton is a nuclear thermal rocket design, but I can't seem to find too much info about it.

Hi, I'm looking for some good books on engine building or modification. Any suggestions or preferences would be appreciated.

I wanted some help in finding out the time taken for a differential mass of gasoline being burnt in the cylinder during the power stroke. Also, does it depend on the residual temperature of the mixture? I tried to find it out through Arrhenius equations but am having a problem finding out...

Homework Statement A 6 cylinder engine has cylinders wirh a bore of 115mm and a stroke of 145mm Each cylinder also has a clearance volume of 300 cubic centimeter. This engine operates on a four stroke ideal otto cycle and at 3000 rpm. The temperature and pressure of the intake air is 25...

Homework Statement 8. A house is cooled by an air conditioner. The outside temperature is 32°C and the inside temperature is 21°C. The heat leakage into the house is 9000 kcal/hr. If the air conditioner has the efficiency of a Carnot engine, what is the mechanical power required to keep the...

What are the uses of mineral oils and self contained lubrication system in internal combustion engine? Please answer fast Its urgent

I am looking for something on the lines of this - http://www.tineye.com/ . i.e a site where one uploads an image and it gives back similar images from other websites. (note - I am not asking for face recognition or similar thing , that I guess would be a big demand . I just wanted to find...

Homework Statement What is the maximum effciency of a heat engine whose operating tempuratures are 550oC and 365oC? Homework EquationsE=1-Thot/Tcold The Attempt at a SolutionPLEASE HELP! My thinking is that the effciency is equal two one minus the temperature in the hot resavour...

hi this is my first post on here so please be gentle. my names chris and I am an aerospace engineering student and i would like to build a jet engine based around a turbo charger, i know this concept isn't new but its something i would like to build. I am on a tight budget so i need to build...

Homework Statement Find the constant Torque being applied. We are given a diagram of a piston engine, along with the masses of piston, flywheel and rod connecting the two. I know that the expanding gas in the piston does 4 kJ of work. I know that at the beginning of each rotation the engine...

Ok, so I am working on a project for the summer that involves building a robot-like RC car/atv (for off-road). I want to figure out the cheapest way to get an engine that will output 1hp (which I am pretty sure is pretty close to 36 VDC, correct me if I am wrong though). Is there a way to...

Homework Statement The major difference between a jet engine and a rocket engine is that a rocket carries its own oxidizer, usually in the form of liquid oxygen (LOX). A jet takes in air from the atmosphere as it moves, uses it to burn the fuel, and then ejects all the gases out the back...

how does salt turned into an engine affect?

Homework Statement Calculate the Power, Efficiency, air to fuel ratio. torque-3.809Nm speed-3137.207 l/min T1 Temperature Exhaust=412.598degC T2 Temperature Ambient=19.141degC T3 Temperature Fuel=18.994degC dv/dt Volumetric Flow Air=109.954 l/min p fuel Fuel Pressure= 21.475 mbar...

Homework Statement A thermodynamic engine is operated between two cooler bodies A and B, extracting work until the two cooler bodies reach a common temperature T_f. This work is then used as the input to a heat pump, extracting heat from the cooler pair and heating the hot body C. Find the...

I've just finished some past exam papers and when marking them using the mark scheme something confused me a little One question said when a fire engine moves away from an observer, the pitch of the siren decreased, why and I chose the wavelength of the sound wave decreases The mark scheme...

Hi..can u please tell me the meaning of Idling of an engine...?

Let's say we have a room in which it is around 20° C and at normal pressure. There is a substance that is a liquid, but when the temperature increases to 25° C or so, it rapidly expands, whether that is by boiling (conversion to gas), or just by expanding as a liquid. First question: does...

Homework Statement the gear ratio between crankshaft and driveshaft calculates to be 13.579 at first gear the diameter of the car wheel is 0.6m the transmission efficiency is 0.85 weight of the car is 1200kg if the engineer is running at 1500rpm how do you calculate the speed in...

Hi! I have a question about how thrust is made from a turbojet engine. The most common explanation goes something like "As the fluid gets accelerated there is a net force". I don't think this explanation is either good nor rigorous. The force that accelerates the fluid is, of course, the...

hi there, do anyone here try to start car engine with dry cell(Nickel/cadmium (NiCd)? How many dry cell need to be use if we insist to start the engine with it?

I have to do a paper ( kind of project ) for 4-6 page on Thermodynamics description of a watt steam engine. i have no idea where to start. It is for a Thermodynamics 1 class. Thanks in advance.

Homework Statement I have to draw a temperature versus entropy for a carnot engine. My solutions say that as a parallel to the PV diagram, the adiabatics on the TS diagram are vertical, going from t2 to t1 and vise versa. My question is really how an adiabatic change results in a temperature...

Hey I currently have a project to design an engine and I have chosen to design it for a moped. My research so far has brough me to this: Based on this, how would you guys recommend me proceeding to design the engine? Do I start with the links? From your perspective, what's the best link...

For an upcomming science expo my friend and I are attempting to modify a small engine (such as found in a brush cutter) to run of hydrogen. We do however have a number of concerns and was wondering if anyone would be able to help. Firstly should we run it off tanked hydrogen and air or should...

Hello Can someone tell me basic equation of car engine temp. that depends on load. I don't need a precise equation - i need something simplified for simulation.

I had a drag race two stroke snowmobile that was over ported to a point that low end power was so poor that the engine was very hard starting. I put a drive socket on the end of a V-8 car starter and used 24 volts (two car batteries) for power. Being a bit nervous of the torque kickback, I tried...

Homework Statement What is the indicated thermal efficiency of an engine? Fuel used in total 42.61 cc/min @ 1730 rpm. Fuel used to get to 1730 rpm = 29.16 cc/min no load. Fuel left = 13.45 cc/min to do approx 4.335 kw at 1730 rpm approx 40.95 kph Fuel heat content 34.8 kj/l...

this engine is basically the part of supermileage vehicle which is being made by a team of DELHI COLLEGE OF ENGINEERING to participate in Shell Eco Marathon, Malaysia. Due to some reason, we are getting a higher value of pressure in compression stroke which is continously leading to the failure...

I was wondering what do mechanics do with used car engine oils( lubricants)? Like are they recyclable ..... I know how water and Oil can be separated , but how does one filter dust and other particles from oils.... thanks in advance

I have done a basic test on my car at idle and have found that the exhaust pipe temperature just hits 100 deg C eg boiling point of water 1050mm away from the exhaust port. Is this a good guide to exhaust gas temperature? Can you compare other engines using this method? I also can hang...

Hi guys! This is a question related to IC engine characteristics(performance curves, torque-speed curve). Why is the Starting torque of IC engines small? Also why does it decrease after a maximum? Secondly, In one of the lectures, our professor asked us that in a gearbox form where does the...

The law says that the maximum thermal efficiency of a heat engine can be 88%. If I have and internal combustion engine using 9.8 cc/min instead of 25 to 30 cc/min and the other accepted figure is a 2L 4 cylinder engine for idle is it uses approx 5 HP of fuel just just to idle. So I am doing...

Homework Statement An inventor claims to have invented an engine which operates between constant-temperature reservoirs at 400K and 300K. Data on the engine, per cycle of operation: Qh = 200J Qc -175J W = 40J Th = 400K Tc = 300K Of the first and second laws of thermodynamics, which (if...

Dear Experts, The car moves basically because of the energy from the explosion that happens in the cylinder which pushes the piston whose reciprocal motion turns the wheels. Does the explosion caused by the ignition of gas and air mixture lead to the exhaust gas dirtying the inside of the...

A carnot engine has an efficiency of 59% and performs 2.5x104 J of work in each cycle. a) how much heat does the engine extract from its heat source in each cycle? b) suppose the engine exhausts heat at room temp (20oC) what is the temperature of the heat source? I know that the...

Homework Statement An internal combustion engine operated with methanol (CH3OH) as the fuel has a thermodynamic efficiency of 20%. a) How much work is derived from burning one mole of ethanol in the engine? b) What is the max work that could be derived by reacting the methanol with pure...

what is a farnboro engine indicator and what is it used for?

Homework Statement An engine burns 1.4 kg of gasoline per hour and yields 3.5 kW of power. Homework Equations Calculate the efficiency of the engine when the heating value of gasoline is 43 MJ/kg. The Attempt at a Solution Plz i just need the rule for engine efficiency.