# Tag Info

3

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? ...

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 ...

8

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. ...

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

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 ...

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 ...

5

I think I got this. someone help me verify... So I watch the tach and speedo to determine MPH per 1000 RPM in higher gears (3rd,4th,5th). On my car its about 10, 15, 19.5. [tire diameter (in inches)] * [pi] * [1/(gear ratio * final drive ratio)] / [in/ft] / [ft/mi] * [RPM] * [min/hr] = MPH constants pi = 3.14159 in/ft = 12 ft/mi = 5280 min/hr = 60 ...

5

The basics are quite simple. The motor generates a certain torque N and a certain power P at a given RPM. Further more, the relation between power and torque is: P = C * N * RPM where C is a constant to convert all that odd units. For N, P in SI units, it is C = pi / 30 Neglecting any losses, Power is conserved from the motor to the wheels so you ...

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