CraigJ
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| posted on 12/4/07 at 12:39 AM |
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BHP vs HP
Is there any difference when you see power figures quoted in HP and BHP?
Ive been searching for a doner bike engine with good power figures. Ive come across a few bikes which can be had for less than a grand zx10 137HP and
fzr1000 145HP all around 1990 bikes so i wont need a cat for sva. So is HP and BHP the same or are they different?
Thanks.
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dilley
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| posted on 12/4/07 at 06:40 AM |
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WORMS,A CAN OF
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NeilP
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| posted on 12/4/07 at 07:22 AM |
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Don't know exactly but vaguely recall that one is the power that the engine develops (i.e. calculated) and one is the measured power it takes to
brake the engine.
You've then got the German 'PS' (Pfederstarke?...) which is a kind of metric equivalent to HP/BHP which most manufacturers now
use.
Hopefully enlightenment will come but Dilley is spot on...
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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RazMan
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| posted on 12/4/07 at 07:27 AM |
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Come and share my popcorn - this is going to take a while 
[Edited on 12-4-07 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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bimbleuk
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| posted on 12/4/07 at 07:39 AM |
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I think you'll find that BHP is derived from the original James Watt experiments to find the work done by a pit pony. Applied to an engine it is
the power measured at the crank.
HP is from the SAE standard in the US which was to standardise the method of measuring an engine. Measured at the flywheel but the engine was supposed
to be in road trim. Something like that anyway.
The two main methods of measuring on a dynamometer are the water/eddie current braked dyno so I guess BHP and the inertia roller dyno so HP?
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JAG
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| posted on 12/4/07 at 07:52 AM |
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Horse Power and Brake Horse Power are exactly the same thing.
Brake Horse Power simply means that it is 'as measured' on a Brake. Brake being shorthand for Dynamometer.
The ISO standard measure for power is the Watt.
PS (German: Pferdestärke = horse strength) is German and also means Horse Power and is there older method for measuring power and is very similar to a
UK Horse Power. It's about 1.4% more is all.
This what Wikipedia has to say HERE
[Edited on 12/4/07 by JAG]
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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ian888
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| posted on 12/4/07 at 08:19 AM |
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Hi good day to everyone. Im just a newbie here.
I would like to share my 2cents on this topic. In engineering, BHP is the power measured at the wheels. Therefore, we can say that this is actual
power delivered by the engine after all the power loss that occured in the gear box and all other mating parts. Horsepower on the other hand generally
refers to power delivered by the engine alone. a 120HP engine can have about 20% power loss if it will transmit the power to the gearbox down to the
wheels. This is just an illustration.
Hope i was able to share something.
happy motoring!
ian
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zxrlocost
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| posted on 12/4/07 at 08:22 AM |
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Craig if you want a powerful bike engine
a ZZr1100 1994 is your best bet
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PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
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Fred W B
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| posted on 12/4/07 at 08:40 AM |
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Seems you have answered the question I have brewing in my head - what engines to look for for my next project? - 2 longitudinal mounted bike engines
geared to a single sprocket on a car diff in the back of a wide spaceframe.
It seems that zz11'z that old should be really cheap and If I use Kawasaki's I can call it CANAMSAKI.
Any problems you see with this plan?
Cheers
Fred W B
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MrFluffy
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| posted on 12/4/07 at 08:40 AM |
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The fzr1000 exup puts out realistically about 125hp at the rear wheel in the bike, the 145hp figure is quoted from the crank.
Bimota used this engine in their yb8's with a different exaust and airbox (still keeping carbs and the exup on some of them, which made more
power than the injected version) and were claiming 165hp from the changes so theres a bit to be had if you design the still air chamber properly when
you dont have the constraints of fitting into a bike, that equates to a real world 135 hp at the wheel on mine on the dyno...
Oh and the clutch basket is fragile to say the least, budget for a billet one if you dont want to be picking basket fingers out the sump in 10k...
At least a small bit relevant...
Edit, keep the exup valve in the exaust if you get one, it gives the engine a incredibly flat torque curve that will actually make your vehicle
quicker midrange even though theres tiny top end gains to be had from discarding it. The "exup" is a electrically operated gate valve in
the exaust that varies the exaust diameter according to instructions from the ems. Its worth buying it new cables and retiming it on assembly
too...
[Edited on 12/4/07 by MrFluffy]
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RazMan
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| posted on 12/4/07 at 08:56 AM |
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quote:
Originally posted by Fred W B
If I use Kawasaki's I can call it CANAMSAKI.
.... or even KAWACANAM - sound like a Harry Potter spell
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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jack trolley
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| posted on 12/4/07 at 06:30 PM |
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BHP is only used in the U.K. because in the olden days (pre WW2) HP
was 'calculated' for tax purposes.
This calculation had no relationship with real HP.
Bore size formed part of the formula and led to puny, small-bore engines (A-series).
Typical ignorant, beaucratic nonsense - thank heavens things aren't like that anymore.
B.H.P. refers to power measure on a engine "brake" dynometer. How
accurately it's measured on a dyno opens up a whole different kettle of worms.
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