hp- SAE & DIN & etc...

["estorhok" <estorhok@domain.elided>]

The only difference between DIN and SAE numbers are the "ideal" running
conditions, which are the adjustments to the actual numbers run on a given
dynamometer.  There's also EWG, ISO, and JIS correction factors.  Not much
different.

There are other factors- gross, brake, net, indicated, etc. POWER.
Remember, hp is an "Imperial" unit, while the better unit is kW.

brake ~ net = fully dressed engine (powering all accessories, and proper
exhaust system/ back pressure), what comes out of the crank
indicated = brake + friction, which, ideally, is what the gas is trying to
put into the crank.
Gross= well, whatever the manuf. wants- typically no accessories, and a
perfect exhaust system.

You'll mostly see brake ("b"hp) numbers, as that is now the official
recording standard.  Now the standard from some rather optimistic gross
numbers....

SAE- North America, DIN- German, JIS- Japanese, ISO- rest of Europe (I
think) and no idea about EWG.

Most of this is noted from the 3rd edition of the Bosch Automotive Handbook.

Eric Storhok
Ann Arbor, MI

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