siddhantmantri
13.06.2021 16:34:54
What to look for?
See full version: Calculating Horsepower
What to look for?
How do we work out BHP from WHP?
It’s just best to be honest – if the car doesn’t make the power you wanted, we’ll offer advice on how to get there! [links]
Nope. We run a Mustang dyno, which is very very strict in the first place. We then manually calculate drivetrain losses to ensure accuracy. As a result we KNOW the JFA tuned cars will make the right power on any dyno anywhere in the country. [links]
First up we need to know what each type of drivetrain consists of, and roughly where we need to be;
We also have a weather station in the front of the dyno cell monitoring humidity, and air temperature – allowing us to offer a weather corrected figure, so the figure we give you is the power it’ll make on average. Not on a cold day, not on a hot day, just a straight realistic answer as to what your car will make. [links]
Here are my thoughts. I do a/c repair and installs. I believe it has an effiecency loss do to having to create a static pressure w/ the water before being able to use the force that it creates.
Looking at it from moving a mass standpoint, I can take a 3 ton air handler to move 1200 cfm's of air to do the job in a duct system. It will require a 1/2 hp mtr to do the job at 3.0 amps. If I install a ductless 3 ton system, the mtr. required to move 1200 cfm's is only 1/8 hp @ less than an amp. of power. It doesn't create a static pressure(or very little) to get the job done.Does this have a likeness to moving water? I think so.
Eventually the torque an engine is able to produce stops increasing. Thats when you stop accelerating or your acceleration slow down.
That turbo thing I mentioned above must try to find a balance of backpreasure and efficiency.
When getting a car, one of the most important attributes to know about it is its engine power. Here you look at the engine’s output to see how well it will fare when driving. The unit of measurement is horsepower. The term came when an engineer tried to compare the production of steam engines to that of horses. Horsepower exists in many forms, and in this article, we will tackle WHP vs. HP. They are two key concepts in understanding engine powers, and you should also know how to convert WHP to HP as part of their relationship.
To get the horsepower, you multiply the torque by the speed. You can come across the value by using a dynamometer and torque converter to connect to the engine. Measurement of the braking horsepower takes place on the flywheel under controlled conditions. You apply braking to balance the engine’s output. The BHP is usually higher than the horsepower. One horsepower is equivalent to 1.014 braking horsepower. When you notice that you have a lower horsepower than expected, you may have an engine problem. Some of the issues include engine knocking or broken parts. What about BHP vs. crank HP? The two are the same, and they measure horsepower at the flywheel or crankshaft. A thing to note about the HP vs. BHP value differences is that the BHP value will be higher as it includes the frictional losses.
The HP at the wheels refers to the engine power that reaches the vehicle’s wheels. It is usually less than the HP due to drivetrain loss, mostly caused by friction. more
Naturally, the net output of a given engine is somewhat lower than the gross output. For example, the 217 cu. in. (3,547 cc) “Stovebolt” six in a 1950 Chevrolet had a gross output of 92 hp (69 kW), but a net output of only 85 hp (63 kW). Chevrolet’s 1955-vintage 265 cu. in. (4,344 cc) small block V8, meanwhile, had a gross output of 162 hp (121 kW) with 8.0 compression and a two-barrel carburetor, but a net output in the same form of 137 hp (102 kW).
This is a 1966 Chevrolet Corvette Sting Ray’s 427 cu. in. (6,996 cc) L72 engine, officially known as a Turbo-Jet 427. Early factory literature credited the L72 with 450 hp (336 kW) at 6,400 rpm, but this was subsequently amended to 425 hp (317 kW) at 5,600 rpm — the same horsepower as the previous year’s 396 cu. in. (6,488 cc) L78. Contemporary reviewers were highly skeptical. more
Gross output, which in the U.S. is typically measured using the methodology laid out in SAE standards J245 and J1996, is the output of a ‘bare’ engine running on a test stand with no external engine-driven accessories (e.g., alternators or water pumps), free-flowing exhaust headers with no mufflers, and optimal ignition timing. Gross ratings are also mathematically corrected for standard atmospheric conditions. In other words, gross output represents a particular engine’s maximum output under ideal conditions.