What is HP anyway?

[txrocco at sbcglobal.net (Patrick Bureau)]

HP = estimated calculus version of reality
BHP = car on rollers (dynoed)

--- Allyn <amalventano@sc.rr.com> wrote:
> > I know that 1 HP in electrical power=746 watts.
> But I see power posted as
> HP
> > and BHP for cars. Whats the diff? Is there any?
> 
> HP = calculated horse of engine based on torque @
> rpm. there doesnt seem to
> be a set standard of measurement for this one.
> 
> BHP = brake horsepower, measured at the output of
> the crank. 'brake' comes
> from the method of measurement. engine is run wide
> open, at a specified rpm,
> with some form of braking mechanism loading down the
> crank to keep it at
> that rpm constantly. the amount of torque on the
> brake factored with rpm
> gives BHP. this is the most accurate way to measure
> engine output, but its
> not very practical since you need an engine dyno.
> 
> WHP = wheel horse, measured at wheels
> 
> WBHP = wheel horse on a 'braking dyno', where the
> dyno does the same as the
> BHP method above, just at the wheels instead of at
> the crank output.
> 
> important to note is that HP/WHP figures may differ
> from BHP/WBHP figures.
> non-braking tests may be dynamic (i.e. a dyno run,
> 4th gear pull, etc). in
> those cases, the engine is accelerating. different
> factors play into this,
> which may cause an engine to get higher/lower
> numbers as compared to the B
> results.
> 
> also, dont forget european hp numbers are calculated
> differently sometimes.
> safer to go with the kw numbers and do the
> conversion to us-hp to eliminate
> any confusion.
> 
> hth
> Al
> 
> 
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=====
ATS - Patrick Bureau - txrocco@sbcglobal.net
http://www.longcoeur.com/scirocco/
==============================
'85 2.0L Prowler orangeKamei X1 Rocco
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