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Old 17th September 2005, 00:57   #1
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Question Query regarding Hp v/s BHP ?

I have a query regarding Hp figures, e.g when we say Scoda RS is 150 BHP does it mean the power is at crank/flywheel or drive wheel ?

also how do we calculate the losses occured when power is transferred from flywheel to drive wheel ?

Last edited by Ford Rocam : 17th September 2005 at 01:15.
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Old 17th September 2005, 03:28   #2
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Its always at the crank unless mentioned otherwise. Usually its 15% loss for FWD cars, little more for RWD and then some for permanent AWD.
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Old 17th September 2005, 08:33   #3
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all BHP figures are at crank .. power delivered at the wheels is much lesser (transmission loss)
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Old 17th September 2005, 10:15   #4
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Default OD of sept

read OD of Sept . They have a great shootout of all indian bikes on dyno where the claimed BHP at Crank by manufacturer and the actual BHP at wheel is mentioned
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Old 17th September 2005, 11:43   #5
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Manufacturers quote the crank figures for obvious reasons : Its a BIGGER number

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Old 18th September 2005, 00:16   #6
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Default (BHP or HP) to PS

can someone elaborate relation between PS and HP or BHP here ?
is that unit set as standard by the automotive industry because i guess 1 year back all the figures about power output of car used to be in BHP and now some magazines ( may be all ) give these in PS ?
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Old 18th September 2005, 14:28   #7
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Quote:
can someone elaborate relation between PS and HP or BHP here ?
1 ps (pferdestarke) = 0.986 bhp, or 1 bhp = 1.014 ps....

one is a standard german unit (ps), whereas the other is a non-metric SAE (society of automotive engineers) unit (bhp)...

also, when converted to watts, or S.I unit in power,
1 ps= 735.5 watts,
1 bhp= 746 watts....
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Old 19th September 2005, 15:48   #8
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Agaiin same reason to use PS..makes the HP figure look fatter :-)
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Old 19th September 2005, 21:31   #9
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Quote:
Agaiin same reason to use PS..makes the HP figure look fatter
actually, it's the other way around- a certain bhp is lesser than the same quantity in ps- for example, 100 bhp= 101.4 ps, or in manufacturer's terms, 102 ps....which means that the main reason for the manufacturers to quote their figures in ps instead of bhp nowadays, is to make the car seem more powerful than it actually is; so ps makes hp figures look thinner...
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Old 22nd September 2005, 12:42   #10
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Isnt that the same as what I said veyron ?
I said they use PS to make the actual HP figure look bigger than bhp
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Old 22nd September 2005, 14:33   #11
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yeah if they could they'd state the figures in watts! who knows what'll come next; PMPO for engines??? :-)
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Old 29th August 2006, 20:33   #12
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Thanks veyron1, your description of the stuff was quite good. it helps to konw this figures as well.

Manufacturers are that means cheating us ... hmm.. they are giving us the crankcase figures and not the real ones. Even in cars ????

I read the OD of September, and was really shocked to see the results actually. So much difference in many of the top end bikes.!!!
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Old 6th October 2006, 20:59   #13
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Quote:
Originally Posted by vincentt
Thanks veyron1, your description of the stuff was quite good. it helps to konw this figures as well.

Manufacturers are that means cheating us ... hmm.. they are giving us the crankcase figures and not the real ones. Even in cars ????

I read the OD of September, and was really shocked to see the results actually. So much difference in many of the top end bikes.!!!
Manufacturers are not cheating. PS is the metric standard being used as it closer to BHP. It is simply 75 kg of mass moved through 1g that is 75 x 9.80665. Makes other calculations simple. Many countries are moving towards SI unit which is KW. This makes calculation and comparison even simpler.
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Old 9th October 2006, 08:20   #14
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Quote:
Originally Posted by navin
yeah if they could they'd state the figures in watts! who knows what'll come next; PMPO for engines??? :-)
i totally agree with navin...these manufacturers are bound to come up with something like this...well said!!
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Old 9th October 2006, 11:37   #15
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U know manufacturers are cheating, when their adverts mention their cars with PS and the competition with BHP.

Quote:
also how do we calculate the losses occured when power is transferred from flywheel to drive wheel ?
A dyno test should give you the answer.

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