Engine Definition and 999 Threads

I am most interested in understanding and improving the internal combustion engines of all types from jet engines to 2 stroke lawn mower engines. I have several concepts I have developed thru my own analysis and would like to hear from the professionals.

Honda’s first motorcycle was powered by a 2 cycle engine that ran on straight turpentine instead of a gas/oil mix. How were they able to do that without burning up the engine. If someone wanted to replicate this, would adding graphite to the turpentine improve lubricity?

Good day I am looking for a software called AEDsys.exe. This (AED stands for aircraft engine design) SW was created by Jack Mattingly years ago. It is the backbone of the computations involved in his wonderful book “Aircraft Engine Design” ( authors Jack Mattingly, William Heiser, David Pratt...

TL;DR Summary: Engine performances on gasturb Hello everyone,I’m writing this message because I have an issue so I wanna do a simulation of the performances of the engine cfm56-7b when thrust is 100% on gasturb software is there anyway that can help me and explain me the right steps and the...

I tried posting this earlier, but being my first time somehow got it in mechanical and I wanted it in thermodynamics so I am reposting here. Sorry for the confusion: Automotive cooling system Not sure if this is an appropriate forum for this question or not, but I will try. Many current...

Hi All, Do the left side and right side engines of a plane rotate in the same or opposite directions? Is the angular momentum (gyroscopic effect) of the engine shaft, blades, etc., sufficient to affect the flight path of a plane with large engines? In military fighters, such an effect could be...

Ok, I am an engine builder, building performance and race engines up to as much as possibly 5000 HP. I enjoy playing with cars, and have fitted my 1962 Chevy Corvair with EFI, Distributorless ignition, 4 wheel power disc brakes, etc. No one makes kits for any of this so I simply machined and...

As above. As I understand it, there is a charge coil and a trigger coil, and some circuitry potted in together.

First I have seen a few forums dotted about covering this subject already, however I couldn't find exactly what I was looking for so I apologise if its somewhere on here already. I am trying to calculate the AFR value for pure ethanol. I am only including oxygen in the category of "air" due to...

Very much interested in everything about engines. While the battery EV seems to be the generally accepted propulsion of the future, I think the Hydrogen (Flex) fueled internal combustion could prove to out-perform it in every way. An engine that is designed for Hydrogen, but could also run...

I didn't have much trouble with part a but I'm struggling with b,c, and d. I considered the efficiency formula for a heat engine e = work done by engine/ qh but i am unsure of how to approach it. for part c) not sure how i can get to Tc without knowing Th for d) my gut is telling me 5/2 but i...

On an engine, the timing chain has colored links, and you have to line up these colored links on timing marks on the engine. There's typically marks on sprockets, bearing caps, gears. A understand that you have to line these up in order to get proper timing. I understand that is the reason why...

This was my first attempt which was not right. But it was at least a percent unlike my 2nd attempt. This was my second which I found on another forum website. It said it found the work of step 1, heat absorbed of step 2, work of step 3, and absorbed heat of step 4. However, the answers to the...

Hi, I am currently trying to do a project related to this engine and I am trying to find information about it. I am looking for technical papers, journals or overall description of the inner workings of the engine. I am looking forward for something more in depth than wikipedia. Also...

Hello all, the short story is, I am basically trying to get the same ( or a little more) “power” out of a larger lawn mower type gas engine ( vertical shaft) as one of the largest (120 ish cc) chainsaws ( ref the Stihl MS 880 or newer 881 at approx 10-12k rpm and 9 Hp) The parameters are : a...

Hi all, The idea is to generate as much as possible water steam from heat of internal combustion engine exhaust gas. The so called steam generation device is a simple sloped engine exhaust pipe where water from engine cooling and hot gas is fed at the top and all the mix is exiting at the...

Every time when you increase RPM on longitudinal placed internal combustion engine, car shake to side in oposite direction of crankshaft rotation. This is reaction moment for change in RPM of crankshaft/flywheel. How this reaction moment transfer to engine block/car if crankshaft is separated...

https://www.msn.com/en-us/autos/news/toyota-s-upcoming-hydrogen-powered-5-0-v-8-engine-has-the-potential-to-bury-evs/ar-AA15Q9mq See also an old thread - https://www.physicsforums.com/threads/hydrogen-combustion-engines.70653/ But what material. I know that Nippon Steel & Sumitomo Metals...

Hi everyone I'd like to make a simple Tontie/Whack-a-mole clone on Android Studio. I was thinking I could just use buttons and not use any animations. Could I do this on Android Studio? Or would I be better off learning how to use a game engine? If so, which would you recommend?Thanks

Can anyone suggest sites for getting datasheets of ford engine 220hp sensors (sensor datasheets). Like cam sensors, crank sensor etc.

Hello everyone, I am Abheer and I am a high school student. Few days back I saw an article about RDEs (Rotating Detonation Engines). The article said it is the future of aviation propulsion. I want to ask, is it really so that RDEs are future or the low/high bypass turbofan engines will continue...

My choice is C, which is "equal to." Here is my reasoning: The engine pulls on car 1, so car 1 is having a force acting on it, which pulls car 1 forward. Likewise, the same amount of force is applied on car 2 by car 1 by moving forward with the same amount of force from the beginning. So it is...

We've had several threads on the SR-71 (and related craft) and the J58 propulsion system. https://www.physicsforums.com/threads/sr-71-blackbird-supersonic-aircraft.68694/ https://www.physicsforums.com/threads/j-58-engine-inlet-spike.413262/...

Hi, I've been thinking about the solution for cleaning a water-cooled gas cooler and would love to hear some advice from the smarter people with more experience. Description - I will try to roughly explain the concept. Gas Cooler is used to decrease exhaust gas temperature. The exhaust gas...

***A Carnot Engine*** is a theoretical engine unlike a Sterling Engine which can be made practically. Some of the drawbacks of Carnot Engine are, 1)The Heat Transfer occurs only during isothermal process(compression and expansion),this is because the working material (ie) gas or fuel used, if...

Summary: Calculating engine power required for semi trucks under different circumstances. Hello everyone, I would like to ask you for help if that is allowed. For a current project I need to calculate engine power needed in watts under different circumstances. This is something that I will...

Here we have an oil engine. Oil is fed in at the bottom of a column of water, rises up and collects at the top of the column, it overflows into an adjacent column which could be of larger diameter, and is fed back into the column of water. I know it won't work but can someone please explain why not?

As I've mentioned in a few previous threads, at the midpoint of my sci-fi story on a generation ship, I need a disaster that wipes out about a third of the (male half of) the crew. Several people have suggested things like "a virus that disproportionately affects men", but that didn't quite cut...

I have been experimenting with a minimal "toy" physics engine for JavaScript, called verlet.js but now I want to switch to a more versatile and feature rich engine. One feature I would like to use is the ability to assign a reference angle to a pair of segments (i.e. links, i.e. distance...

Hi all, I'm writing a technical manual for a starship in a science-fiction series I'm working on, I wanted to check with some folks here to make sure my calculations are correct concerning the ship's engine thrust. The ship has a fully-loaded mass of 5 million metric tons. Using its...

Industry standard right now is a copper alloy (usually an aluminum bronze) inner liner to promote heat transfer to the coolant channels and the walls of the channels and outer liner are usually made of an INCONEL alloy, usually either 625 or 718. But INCONEL is VERY expensive and heavy. The...

Hi, Have you ever tried to invent anything? Long ago, as a school boy after learning about internal combusion engines, I 'invented' a rotary engine. (It had actually been invented in the 19th century) My dad said "If Fords can't do then you can't" So I stopped. Years later I learned about...

Notable improvement on the Oto cycle engine, invented by Taurozzi in the early 1970s.

Been reading Rocket Propulsion Elements 9th Edition and got approval from my university to design a bi-propellant liquid fuel rocket engine for my senior design project, and I've been understanding everything so far but I haven't quite found an answer to how the pressure works throughout the...

I was wondering if there is a method to measure the actual total mass of carbon dioxide (CO2) emitted from a diesel engine used with a generator for power generation (https://www.cat.com/en_US/products/new/power-systems/electric-power/diesel-generator-sets/1000028914.html). Infrared CO2 sensors...

I am measuring the volumetric flow rate of a diesel fuel using "Turbines" flow meter, both in the supply and return fuel lines of an industrial diesel engine (https://www.cat.com/en_US/products/new/power-systems/industrial/industrial-diesel-engines/18398034.html – coupled with a generator for...

Please, i need help

Hi, This post is about a 4-piston, 4 stroke internal combustion engine(ICE).Here is an youtube animation for such an engine. I actually have 2 questions. Q1: We have seen in demos and videos that in a 4-piston (ICE) engine, the pistons P1 ,P4 (pair 1) and P2, P3 (pair 2) are in phase when...

https://news.mit.edu/2022/thermal-heat-engine-0413 This team that developed this device claims it is capable of generating electrical current from a 1900C heat source via the photovoltaic effect. I was wondering if the generated electricity was put through an initially 1901C electrical...

Hi, Here is a question - somewhat futuristic and at the moment, hypothetical. How difficult will it be to build a 'hybrid' Jet (turbofan) engine? The engine should be able to handle both Kerosene and (gaseous) Hydrogen as fuel. After burning the kerosene for a while, Hydrogen will take over as...

Consider mixing ice water with the hot water and vice versa so that the two reservoirs are closer to the same temperature. What will happen to the mechanical/thermodynamic efficiency and ideal Carnot efficiency of a heat engine?

My book states the answer to this problem is . I have gotten very close to the answer. My problem is my Tc/th and tc/tm are flipped compared to the solution. I feel like I am missing something in my algebra but can't see where I am going wrong. Could I get some help identifying where my...

I am not sure this is the right forum, but thought I would try, and you can flock me if I am wrong =) I have a real world problem. However, I don't recall ever having studied electromagnetism, thus I don't really have the necessary background to tackle this problem. I tried to speed up my...

I was reading propulsion chapter 9 of Anderson's Flight book (http://213.230.96.51:8090/files/ebooks/Muhandislik/Anderson J.D. Introduction to flight (8ed., MGH, 2016)(ISBN 9780078027673)(O)(929s) EAs .pdf) and came to Figure 9.18 b) & c), Figure 9.19 (I cannot post the image here due to...

My solution was that there would be a force of 0 Newtons on the bolt as the bolt is not moving. But this answer is wrong. Where am I going wrong?

Hello, I'm wondering how I could make an isopropyl alcohol rocket engine. Currently I'm testing with plastic bottles, and that's not quite exciting. The alcohol quickly burns out because it is just some vapor in the bottle. There also isn't enough oxidizer, as the bottle quickly fills in with...

I was reading around Stirling engines and there's something I am not sure about, can't see a logical explanation. So the ideal gases discussed are hydrogen and helium on account of their higher thermal conductivities. But I am unclear on what motivation there would be to use hydrogen which has...

Here is a diagram of my interpretation of the problem: Where I'm thinking that the engine originally takes heat from ##T_h## to ##T_l##, in which case ## \frac { Q_{h} } { T_{h} } = \frac { Q_{l} } { T_{l} } ## and ## W_{out} = Q_{in} - Q_{out} = Q_h \left( 1 - \frac {T_l} {T_h} \right) ##...

This is pretty interesting. It sounds like GE and the Air Force have been able to make some good improvements recently...