BHP is brake Hp AKA SAE HP. BHP is what you consider "regular" hp. Now Stihl rates there saws using BHP while husky uses DIN HP. Husky does this IMO because it makes their saws look better on paper. DIN is actually a german standard. What irony. A Swedish company uses a German rateing while a German company uses a American standard.
Hp
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Tony Snyder
Addicted to ArboristSite
They are the same and interchangeable terms, except the term bhp implies that it was measures by a friction brake and torque arm. You can still view those units in the museums. Now they use dynomometers. 746 watts (joules/sec) = 1 horsepower. That is not directly convertable to motor watts (VA) as there are losses in the motor and hook up.
Also note that there is a significant difference in electric motor HP a compared to gas engine HP. It comes in the form of stall resistance and tolerance to over load .
There is a slight difference in DIN hp and SAE hp. Very slight.
There is also another big can of worms in farm tractor HP vs lawnmower HP(A whole other story)
Hope this helps.
Also note that there is a significant difference in electric motor HP a compared to gas engine HP. It comes in the form of stall resistance and tolerance to over load .
There is a slight difference in DIN hp and SAE hp. Very slight.
There is also another big can of worms in farm tractor HP vs lawnmower HP(A whole other story)
Hope this helps.
Neither one is more powerful. SAE BHP will always have a lower number than DIN HP when the power of the unit is equal.
tony marks
Addicted to ArboristSite
anyone know a link ,where a fella could read up on the subject. thanks
Tony,
I realize that I am gettin a little off the topic but as you stated earlier lawn mower vs tractor is totally different. The hp ratings of mower is the engine and in my opinion has little to no effect on their ability. If some one does not believe me then they should mow with a 1970 110 Deere which I believe had a 8 hp engine then go use a 2000 425 which is 20hp. I do not believe they will see much difference in power. The desgin differences in the deck will allow the 425 to mow at a higher speed. When looking a tractor there have been two standards PTO hp which is measured with a dyno at the pto shaft and drawbar which is the actual draft at the hitch. Today manufactures have went to publishing engine hp to make there tractors look more powerful. It is interesting that since 1920 no tractor model could be sold in Nebraska that had not gone through extensive power testing at the University of Nebraska. I heard a few years ago the they were looking at ending the law so it may not be going on today.
Bill
I realize that I am gettin a little off the topic but as you stated earlier lawn mower vs tractor is totally different. The hp ratings of mower is the engine and in my opinion has little to no effect on their ability. If some one does not believe me then they should mow with a 1970 110 Deere which I believe had a 8 hp engine then go use a 2000 425 which is 20hp. I do not believe they will see much difference in power. The desgin differences in the deck will allow the 425 to mow at a higher speed. When looking a tractor there have been two standards PTO hp which is measured with a dyno at the pto shaft and drawbar which is the actual draft at the hitch. Today manufactures have went to publishing engine hp to make there tractors look more powerful. It is interesting that since 1920 no tractor model could be sold in Nebraska that had not gone through extensive power testing at the University of Nebraska. I heard a few years ago the they were looking at ending the law so it may not be going on today.
Bill
tony marks
Addicted to ArboristSite
thanks bud ,i put the link on my favorites list so i can take time to study it . 
Tony Snyder
Addicted to ArboristSite
Sunday 1:10 pm. I'm off to where they put honest horspower to the test. The Casey Illinois antique tractor pull. Allis Chalmers and JDs rule.
Too bad they don't have Nebraska tests for chain saws.
Too bad they don't have Nebraska tests for chain saws.
max2cam
ArboristSite Guru
I could never figure out how a lawn mower engine rated at 3.5 horsepower can bog down in tall grass when 3.5 flesh & blood horses can pull a tree down. Obviously the term "horse" in horsepower is somewhat misleading when applied to the internal combustion engine.
Stumper
One Man Band
The original "horses" in horsepower were mining/ore carrying ponies. I don't remember all the details but I think the 1 hp rating was arrived at by calculating how much weight a ponie could transport over a given span of time. Obviously, electric motors and internal combustion engines have an advantage since they don't have to stop to take a breather! The ability to keep putting forth a constant effort for a long period of time doesn't necessarily equate to the ability to exert a great efort in a short burst.
