Gustav II Adolf yes it is. But it is there and sometimes it makes things look a bit weird, for example; a McLaren 720s has (you would) think 720 hp but in imperial it's something like 710. Same goes for the Koenigsegg one:1 which power to weight ratio isn't 1:1 if you use imperial hp.
It's easier to understand the difference between Imperial and Metric horsepower than it is understand the difference between different organizations and nation's horsepower measurement standards. Metric vs Imperial is just different units that can be converted, but SAE net horsepower vs, say, gross brake horsepower is something else.
Ya. A dyno is a “brake” as it applies a force that resists the torque generated by the motor. If you had no dyno or “brake” the engine would have no load. Power is force (load) times speed. Can’t measure power if you can’t load (“brake”) the engine.
Most of the world still measures gross horsepower. That is why identical engines seem to advertised with lower output in the US, even if the actual horsepower is the same.
Hmm, I have a 66 Ford Fairlane with a 2-port 289 in it (all original) and according to my papers it’s got 200 SAE horsepower, but if SAE was introduced in 1972, what does that mean?
A video is titled "The Truth About Horsepower" and doesn't even touch what horsepower actually means (work done over time), how horsepower is calculated (TQ×RPM÷5252), or the difference between imperial and metric HP. Great job........
If the item in question is the car than there should be laws on the books that the advertisement has to be wheel horse power, but if the item in question is just the engine, well then, do what ever i guess, probably net and gross would be nice
Horsepower to weight ratio determines rate of acceleration but horsepower determines top speed. That is why a lighter car with less horsepower might accelerate as fast as another heavier car with more horsepower to a certain point but at higher speeds the higher horsepower car will pull away. So there is an incentive to buy a a lightweight smaller engine car because it will still accelerate fast to 150km/h.
The weight pays a big role into the acceleration. But there are a lot of factors. You need the complete power curve, the size of the wheels influence the acceleration and much more.
Daniel Khattar In the rest of the world, we use KW/KWh to measure electricity consumption. Personally never heard anyone use newton meters outside of a lab or something
or not even that. more precisely "spits out some numbers", that are not representative of anything. and then you change the BRAND of the dynamometer and start all over.
Nebbia affaraccimiei As far as I know, the main use for the dynometer is to measure the horsepower before and after modifications to see if the power actually got higher or not. But for getting the exact horsepower it's not accurate, as you've already said. I wonder why wouldn't they do some routine calibrations to get the numbers right.
I don’t think “horsepower” means indicated horsepower. The numbers would be much higher if they were indicated. Read here about BMEP (brake mean effective pressure) and IMEP (indicated mean effective pressure) x-engineer.org/automotive-engineering/internal-combustion-engines/performance/mechanical-efficiency-friction-mean-effective-pressure-fmep/
650 HP is a lot but in reality once it goes through the transmission and to the wheels some of the power is lost...depends on the drive train too...I don't know the exact percentage that's lost but I believe AWD loses the most because the power has to go to all four wheels all the time..you might be looking at 550 wheel horse power..not an expert but I enjoy driving so I try to keep up on how stuff works a little lol hope that helps! have a nice day!
that's awesome man, good for you! car will definitely be a monster but the 650hp is probably at the crankshaft, not the wheels..it'll be a blast either way I'm sure lol
No, a higher HP/L means that the engine is more efficient (not fuel efficiency) and has a higher output at a lower engine volume, its just an impressive number
No, HP/L means nothing because horsepower is a function of torque and ENGINE SPEED! If your 2.0L engine has to rev 4x harder to make equal horsepower, it's actual displacement is more than a 7.0L engine at 1/4 the engine speed. This is why a Z06 makes more power and gets better fuel economy than an S2000. Displacement does not determine fuel consumption or efficiency. Seriously, this is so old, old, old... You shouldn't be into cars if you don't understand this by now.
And then there is the difference between imperial and metric horsepower to make it even more complicated...
Gustav II Adolf yes it is. But it is there and sometimes it makes things look a bit weird, for example; a McLaren 720s has (you would) think 720 hp but in imperial it's something like 710. Same goes for the Koenigsegg one:1 which power to weight ratio isn't 1:1 if you use imperial hp.
It's easier to understand the difference between Imperial and Metric horsepower than it is understand the difference between different organizations and nation's horsepower measurement standards. Metric vs Imperial is just different units that can be converted, but SAE net horsepower vs, say, gross brake horsepower is something else.
Antoine yes I 100% agree that's I was merely adding some (less important) information.
Only matters what wheel hp is
Speed Demon yup, HP sells cars BHP moves them
TheAnonymouse, I think you mean WHP
I think you mean hp sells torque wins races.
Only problem comes when people compare wheel horsepower of one car vs crank for the other.
wheel hp is the real hp
“Power makes you fast in the straights, lightweight makes you fast everywhere” :)
I still question on why it is called "brake" horsepower??
something to do with old dynos, and how the horsepower was measured by how much they resisted the brakes applied to stop the engine or so
Ya. A dyno is a “brake” as it applies a force that resists the torque generated by the motor. If you had no dyno or “brake” the engine would have no load. Power is force (load) times speed. Can’t measure power if you can’t load (“brake”) the engine.
th-cam.com/video/dIDUlRqay3E/w-d-xo.html
You forgot the + 5hp stickers, and what category the are.
ThaDutchDK1989 Fake horsepower
Love those videos.. Better than all my teachers
Huh i actually learned something i always thought bhp and whp were synonyms
Most of the world still measures gross horsepower. That is why identical engines seem to advertised with lower output in the US, even if the actual horsepower is the same.
Hmm, I have a 66 Ford Fairlane with a 2-port 289 in it (all original) and according to my papers it’s got 200 SAE horsepower, but if SAE was introduced in 1972, what does that mean?
A video is titled "The Truth About Horsepower" and doesn't even touch what horsepower actually means (work done over time), how horsepower is calculated (TQ×RPM÷5252), or the difference between imperial and metric HP. Great job........
Vyppaaa11 thank you
Vyppaaa11 Oh fuck off
Johnny Lakman The truth hurts eh?
The horsepower tq rpm coefficient is 5252 rpm
Jayden Eladnani-Tempo you are correct, I shall amend my original statement.
If the item in question is the car than there should be laws on the books that the advertisement has to be wheel horse power, but if the item in question is just the engine, well then, do what ever i guess, probably net and gross would be nice
What is the WHP of 98 1.8l miata?
Wonder what that engine is shown in the thumbnail
Do a video about torque
Horsepower to weight ratio determines rate of acceleration but horsepower determines top speed. That is why a lighter car with less horsepower might accelerate as fast as another heavier car with more horsepower to a certain point but at higher speeds the higher horsepower car will pull away. So there is an incentive to buy a a lightweight smaller engine car because it will still accelerate fast to 150km/h.
The weight pays a big role into the acceleration. But there are a lot of factors. You need the complete power curve, the size of the wheels influence the acceleration and much more.
Why isnt this content on your main channel?
Because Phil's V6 is taking all the time to be installed because they can't read the instructions! :-)
How would this translate to electric motors?
Still confused. Does net brake hp = SAE Net Standard?
we use kilowatts in australia (sometimes we use horsepower but mostly KW)
Daniel Khattar Indonesia still use metric HP as power and Nm as torque unit.
Daniel Khattar In the rest of the world, we use KW/KWh to measure electricity consumption. Personally never heard anyone use newton meters outside of a lab or something
Man from Nantucket that's true. watts generally only used for device that use electricity for its power source.
So the dynometer only measures WHP ?
or not even that. more precisely "spits out some numbers", that are not representative of anything. and then you change the BRAND of the dynamometer and start all over.
Nebbia affaraccimiei
As far as I know, the main use for the dynometer is to measure the horsepower before and after modifications to see if the power actually got higher or not. But for getting the exact horsepower it's not accurate, as you've already said.
I wonder why wouldn't they do some routine calibrations to get the numbers right.
I don’t think “horsepower” means indicated horsepower. The numbers would be much higher if they were indicated. Read here about BMEP (brake mean effective pressure) and IMEP (indicated mean effective pressure)
x-engineer.org/automotive-engineering/internal-combustion-engines/performance/mechanical-efficiency-friction-mean-effective-pressure-fmep/
Wheel horse power is the real horse power
Thank you
is that a 4age 20v black top
Iron Port It's a paperweight
Interesting!
And now I want to know what shp is, presumably shaft horsepower.
My life was a lie.
And no matter what happens Porsche's always have announced hp on the bench
So 650 HP doesn’t sound as powerful as it makes it out to be?
650 HP is a lot but in reality once it goes through the transmission and to the wheels some of the power is lost...depends on the drive train too...I don't know the exact percentage that's lost but I believe AWD loses the most because the power has to go to all four wheels all the time..you might be looking at 550 wheel horse power..not an expert but I enjoy driving so I try to keep up on how stuff works a little lol hope that helps! have a nice day!
Matt Stelljes Next year’s Camaro has up to 650 hp; I was playing on buying it so that’s why I was asking
that's awesome man, good for you! car will definitely be a monster but the 650hp is probably at the crankshaft, not the wheels..it'll be a blast either way I'm sure lol
using HP is stupid still, i wish we could finally get used to using kW instead. for obvious reasons.
hi from Ohio 🙏
Seth Davis oh hi
High from the netherlands
Simply use kw
I thought it was going to be an explanation on how they measured how much power a horse had. I'm somewhat disappointed.
Shelby S Don’t know how it was measured but I’m sure I remember seeing one horse actually has 14.9 HP. Just to confuse things further 😂
I thought most manufacturers measured at the crank...
DutchedUp yes. I think this is true. The comment about Indicated power is wrong I believe.
Just use PS instead HP 😂
*gasp* Its Camelpower!!?
Wheel hoursepower is real horsepower
And then there is pferdestärke.
people who use bhp to describe a car tuned on a rolling road that measures in whp only....
ahhhhhhhrrrrrrr
Alex Thompson many people do this for the simple fact that you can estimate your drive line loss. They are not (always) incorrect for doing this.
There goes 2 minutes of my life to a video which didn't teach me anything that's actually important about horsepower
mx5😋
Torque per minute
Lol what
still confused.
I personaly prefer PS
Ooowwyeahh
Science Garage did it better :)
HP/L means nothing.
ChokeKOO! So a 7.0l engine with 500 hp is better than a 2.0l with 499? Give me a brake...
No, a higher HP/L means that the engine is more efficient (not fuel efficiency) and has a higher output at a lower engine volume, its just an impressive number
No, HP/L means nothing because horsepower is a function of torque and ENGINE SPEED! If your 2.0L engine has to rev 4x harder to make equal horsepower, it's actual displacement is more than a 7.0L engine at 1/4 the engine speed. This is why a Z06 makes more power and gets better fuel economy than an S2000. Displacement does not determine fuel consumption or efficiency. Seriously, this is so old, old, old... You shouldn't be into cars if you don't understand this by now.
Redfox [赤い きつね] Efficiency is pinned to fuel consumption.
That'll butthurt all keyboard boy racers.
first
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