The formula that works best only applies to the small newer normally aspirated (carbureted) 4 cycle engines. The ratios change slightly worse with altitude and slightly better with fuel injection and tuning. Most American mowers and the newer 4 cycle outboard motors fit into one of these two formulas: Typical new carbureted engine well tuned: 1 x HP per each 25 cc Fuel injected: 1 x HP per each 22 cc Notes:-Most engines are tuned down to a lower HP for better engine life. -It is common for the same cc engine to be built in 3 different HP versions with the highest rated being the maximized HP per cc version. That is how you see price and HP changes on the same cc engine made by the same company. -Some of the newest (2008 and newer) engines from Japan perform slightly better. A typical 150cc motor should equate tobetween 3.5 - 6 HP+ depending on tuning with 5 HP being the adv. The actual formula plots as a curve and is not linear and also does not apply to Max/High Performance engines like in motorcycles.
I'm looking to purchase a new lawnmower. It says it's 158cc. About how much horsepower is this?
horsepower is engine power. cubic centimetres is engine displacement. (sometimes proportional but) they are not directly related.
There is no direct relationship between the cylinder capacity of an engine and the horsepower that it can generate. It depends on the engine design, the fuel amongst other factors.
An engines cubic capacity cannot be converted, mathematically, to horsepower without a host of other information..
"Robert Fogt" The amount of horsepower output by an engine depends on more than just the engine size. For example, a tricked out 4.7 liter engine will have more horsepower than an old stock 4.7 liter engine. You wont be able to convert directly between them. For new cars you may be able to find data sheets that lists both engine size and horsepower. Otherwise you would have to take it to a shop to be placed on a machine to measure it.
I think it is somewhere around 50 horsepower, if I'm not mistaken.
You are trying to compare apples and donuts. 179cc is a size of engine that would have a fairly wide range of horsepowers. Horsepower is a power rating.
Depends what specific model of engine it is... Try looking up the model of car on Wikipedia and convert the KW (Kilowatts) to horsepower through an online converter :)
You can't convert cubic inches to horsepower. more cubic inches usually mean more horsepower but it horsepower is determined by more than displacement (i.e turbo chargers and engine internals). You can find horsepower per cubic inch by dividing horsepower by cubic inch, but there is no way to use just cubic inches to determine horsepower
This question really has no answer. Displacement (liters) and horsepower are two completely different types of measurements. Displacement measures how big the engine is, and horsepower measures the power output. A bigger or smaller engine doesnt mean more or less power.
HP does not directly relate to cc
1 horsepower = 0.745699872 kilowatts you would convert it when you want a metric measurement for horsepower an example 400 horsepower(mechanical) = 298.2799 kilowatt