"Christopher Tidy" wrote in message
...
Hi all,

This group often sees questions about ratings (can my 2 hp electric
motor develop 3 hp? can I draw 150 A from my 100 A supply? etc.) so
I'd
like to ask a rating question. I think this one might spark some
debate.
If you buy a good electric motor, the power rating is a continuous one
(or it says otherwise). Same with most pieces of industrial equipment.
But what about a car? Is the 130 hp or whatever maximum engine power
the
manufacturer quotes a continuous or an intermittent rating? I was
always
under the impression that it was an intermittent rating, though quite
where I got that idea I can't remember. I'm not asking if the engine
will wear out quickly developing its maximum power rating
continuously -
I'm sure it will - I'm just wondering if it will overheat?

Any thoughts? Just a matter of curiousity...

Best wishes,

Chris


HP is not directly measured in either case. It is based on an equation
using the torque and RPM. In a normal auto engine the torque and HP both
have a peak number. That is the number most often quoted. If the cooling
system is properly designed for the engine it will not overheat BUT it
will run warmer than it normally would. However most AUTO engines built
cannot handle running at the max numbers for long because they are made
so light to save fuel.



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