New answers tagged

0

Here is something to try. Start the car, then disconnect one of the battery leads. Should stay running, if it does, turn on the lights. IF it dies, it is your alternator. Might have enough strength to keep it running with out too much of a load(without lights, a/c), but not enough with a higher load. That will also weaken the battery. The cheap way to ...


1

Power <-> torque relation In general, the relation between power an torque is a simple formula: Power[kW] = Torque[Nm] * RPM * π / 30,000 which means that you can always calculate the one curve from the other in torque/power diagrams (That's also what the dynamometer does) So, why are always both curves plotted, if they are more or less the same? ...


0

my first guess would be that there is a problem with your idle air control valve. when you turn on extra loads like headlights or the rear defrost it is the IAC which rev up the engine to compensate for the extra load.


1

In the simplest terms possible: Torque = Lbs/Ft. A concrete, real measurement of the twisting force produced by the engine. Horsepower = An arbitrary, made up unit of work. A unit of horsepower is predicated on the assumption that a horse can pull with a force of just over 180 lbs. The mistake most people make when engaging in this debate is ...


1

Typical analogy: Potential Energy:Torque::Kinetic Energy:Horse power Torque can exist without motion.It is a capacity to do work. Horsepower can exist only in motion. It is rate of doing work. Power of engine = Torque * Speed; To refer an engine running at constant load, Power reference is used to extract maximum power.. To refer an engine running at ...


6

Torque is work, horsepower is work rate In the context of engines: Torque indicates how much load an engine can carry for a certain distance in a certain amount of time. Power indicates how fast the engine can move that load over that distance. Some other things that may help to explain the difference between the two: Torque is what accelerates a ...


5

Torque is the amount of force exerted by your engine at a particular RPM. In two cars with equal gearing and in the same gear, a car making twice as much torque will accelerate exactly twice as fast. Horsepower is calculated from torque and RPM. A given amount of torque at a low RPM equals less horsepower than the same amount of torque at a higher RPM. ...


2

You need one of 2 things - volts or amps. To jump start the car, you need something with 12-14v and able to crank out 100+ amps. You can charge your battery with anything with a higher voltage. There is a video of someone charging his battery with a bunch of AA batteries in series. You have to let it sit for a bit. This is only going to work if you ...


3

No, you can't. A car battery needs a lot of amps at ~12v, and most USB outlets are rated between .5A and 2A at 5v. Car batteries run in the hundreds of amps at 12v. Water hoses often make a good analogy for electricity. Think of amps as the width of the hose, and volts as the speed that the water is flowing at. Your smartphone powerbank is a hose the size ...


8

Horsepower is how much power the engine can produce (how much work is done in a given time), wheras torque is the amount of turning force it can make (how much work is done). The two are quite intricately linked, so you can't have one without the other. You'll need to think of a few physics equations: Force = Mass x Acceleration Power = Work Done ...


3

What exactly is meant by cylinder head intake/exhaust port volume? The amount of air that can pass through the intake or exhaust ports as well as the amount of resistance (back pressure) that is required to get to the particular flow quantity. You are trying to reduce the back pressure (energy) required to get to your desired flow rate. There are two ...


2

From doing some reading here: http://www.jegs.com/tech-articles/cylinder-heads.html it looks like what you are referring to the size of the values and the amount of lift they get. Here's a couple of pictures that should help. This is the setup for basic overhead cam operation. Here's another, simpler diagram that shows what happens when the valves open ...


9

Intake manifold runner length is the linear distance from the inlet port (the face of the head) to a common point shared by all cylinders. Depending on the throttle position this could be the open atmosphere (if each cylinder has its own throttle butterfly) or a plenum (if they share a throttle body). The intake runner volume is the volume of that section ...


3

I didn't see anyone mention it but I believe any increase in power would only be at wide-open throttle (WOT). So if you are racing or really aggressively pulling away from stop lights or accelerating, maybe it helps. Day-to-day driving at less than WOT the engine management system will keep the air-fuel ratio at an acceptable value. If it doesn't get enough ...


7

It depends. Just because an intake can flow more air mass doesn't guarantee that the engine will utilize it. The intake is part of a system of components. The engine produces power by managing air flow into and out of the combustion chamber. There are usually other actors involved: Intake side. Carburetors, throttle bodies, intake manifolds, intake ...


1

This exact same issue happened with me in a Ford Focus. As rpmerf said, check the terminals. In my case, after removing the terminals from the battery and reseating them, the car cranked over fine.


3

The working cycle of an 4 stroke internal combustion engine is like: (1) Inlet of the fresh air (2) Compression (3) Working Cycle - expansion (4) Exhaust Cooler intake air is especially beneficial for part (1). Since cooler air has a higher density, it means that the gas velocities at the inlet are lower. Therefore lower pressure losses at the cylinder. ...


4

Almost never? Mainly because they're really a 'hot air intake system'. This is especially true for cars using forced injection due to the high under-hood temperatures. If you want to reduce intake restriction look into a less restrictive 'panel' filter like a K&N. Even then, it really only matters if your car is intake (vs exhaust) limited and your ECU ...


14

Does this mod ever give a measurable increase in power? tl;dr: yes, sometimes it works well. But... Your picture is a good illustration of some of the problems with just saying "cold air intake" and expecting that to mean the same thing to all people. Let's break down the pieces of the puzzle and talk about how those might help or hurt: Filter: ...


7

The point is to feel like you've done something cool to your car and freed it from the shackles of The Man/the OEM intake. The primary benefit of Cold Air Intakes is to the bank account of the kit manufacturer, the secondary benefit is your car making a nicer noise, if you like the sound of an aftermarket intake. There's been a few debunkings of CAIs over ...


2

Yes, it's a design issue but.... This is the reason. Enfield has push rods and the max RPM is 5200 RPM The KTM has 4 valves per cylinder, good for breathing The Enfield has two valves per cylinder. More valve weight with pushrods = low max RPM. The KTM has an overhead cam. The is makes the valve train very light allows for higher ROM The Enfield has an ...



Top 50 recent answers are included