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Power measures work capacity, or work done, per unit time. Work done measures the energy used (for example) to move a load through a distance.
If I move a mass of one kilogramme through a distance of one Metre, then I will have used a Joule of work. If I do this in one second, I will have used a power of 1 Joule /second, or one Watt.
746 Watts - roughly 3/4 of a Kilowatt - is one Horsepower.
A horsepower is so called because (ironically) James Watt's experiments on power measurement, involved using a horse pulling against a weighted pulley, hauling coal from a pit shaft. A leather belt was used to brake a rotating shaft. When the horse could no longer pull hard enough to rotate the shaft, Watt called the load, taken over one second, a Brake Horsepower. The maximum work done by Watt's experimental pony was equivalent to 550 foot pounds.
In fact horses are much more powerful than 1 horsepower (BHP) but the mechanical inefficiencies of Watt's early experiments, could not take in to account frictional losses and other inconsistencies. A horse may output up to 15 Horse power.
Petrol and all other engines' power is measured using the modern equivalent to Watt's early experiments. Power is measured at the out-put drive shaft. The power needed to brake the engine is its Brake Horse Power.
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What is the indicated power formula for four stroke petrol engines?
Work=Power x Time
Why do most very large engines operate on two stroke cycle?
very large is the keyword here. for a very large engines that runs large machines, we need high power engines. two-strike cycle engines produce more power than 4-stroke cycle engines. that's why they are used. as they produce more pollution than 4-strokes, they must be limited to small spaced engines machines or large machines that required very high power.
How does petrol fuel ignite in the engine?
The compressed petrol gas fuel is ignited by a spark plug thus causing the engines' power stroke.
What are advantages of two stroke engines over four stroke engines?
There are a couple, less parts for one therefore lighter. Also, 2 stroke engines fire every time the piston comes to the top. Which means every stroke is a power stroke. 4 stroke engines fire every other time.
Which supplies more power a 4 stroke engine or 2 stroke engine?
2-stroke engines produce much more power than 4-stroke.
How do 2 stroke engines provide more power than a 4 stroke?
In a 2 stroke, every second stroke of the engine is a power stroke. In a 4 stroke, every 4th stroke of the engine is a power stroke. Knowing this, a 2 stroke has double the power as a 4, in the same cc
What is the main purpose of 4-stroke engines?
To provide power.
Why do most very small engines operate on a two-stroke cycle?
two-stroke engines can produce more power than four-stroke engines that have the same size. they can occupy small spaces and produce the desired power. they are on the other hand produce more pollution than 4-stroke engines. that's why they are limited or suitable for small engine spaced machines
Why water is not used as a petrol?
Since water doesn't burn like petrol, it's far less useful to power engines with.
What amount of power required to make the 2 stroke petrol engine to 4 stroke diesel engine?
you cant turn a 2 stroke into a four stroke. and i don't think you can run diesel in a 2 stroke
Why you prefer four stroke engine over two stroke engine?
Four stroke engines are quieter than two strokes, but have less power.
What happens to the speed using 2 stroke compare to 4 stroke?
two stroke engines have a power stroke every second revolution of the crank shaft. four strokes have a power stroke every fourth revolution of the crank shaft. that is why a 125cc two stroke has about the same power as a 250cc four stroke.
