Brett,
No malice was intended and my response was a reaction to your deviation.
Below is I feel a more apt explanation to your thread drift and Malcolm's question.
BRITISH HORSEPOWER
The acronym
bhp may also be used for
British horsepower, which has the same definition as the American
SAE gross brake horsepower: 33,000 lb·ft/minute. More information on American SAE horsepower measurements is below.
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SAE HORSEPOWER </B>
SAE gross horsepower<o
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Prior to the 1972 model year, American automakers rated and advertised their engines in brake horsepower (bhp), frequently referred to as
SAE gross horsepower, because it was measured in accord with the protocols defined in
SAE standards J245 and J1995. As with other brake horsepower test protocols, SAE gross hp was measured using a stock test engine, generally running with few belt-driven accessories and sometimes fitted with long tube (test
headers) in lieu of the
OEM exhaust manifolds. The atmospheric correction standards for barometric pressure, humidity and temperature for testing were relatively idealistic.
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SAE net horsepower<o></o>
In the U<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com
</st1
lace>nited States, the term
bhp fell into disuse in 1971-72, as automakers began to quote power in terms of
SAE net horsepower in accord with SAE standard J1349. Like SAE gross and other brake horsepower protocols, SAE Net hp is measured at the engine's crankshaft, and so does not account for transmission losses. However, the SAE net hp testing protocol calls for standard production-type belt-driven accessories, air cleaner, emission controls, exhaust system, and other power-consuming accessories. This produces ratings in closer alignment with the power produced by the engine as it is actually configured and sold. The change to net hp effectively deflated power ratings to assuage the
auto insurance industry and environmental and safety lobbies.
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SAE certified horsepower<o></o>
In 2005, the SAE introduced a new test protocol for engine horsepower and
torque. The new protocol eliminates some of the flexibility in power measurement, and requires an independent observer present when engines are measured. The test is voluntary, but engines completing it can be advertised as
SAE-certified.<o
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A few manufacturers such as Honda and Toyota switched to the new ratings immediately, with multi-directional results; the rated output of
Cadillac'ssuperchargedNorthstar V8 jumped from 440 horsepower (330 kW) to 469 horsepower (350 kW) under the new tests, while the rating for
Toyota'sCamry 3.0 L
1MZ-FE V6 fell from 210 horsepower (160 kW) to 190 horsepower (140 kW). Much of the drop can be attributed to <st1
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lace> now rating engines on 87 octane, compared to Lexus which uses 91 octane. This is why the same 3.3 L
3MZ-FE V6 engine in the Lexus ES330 and Camry SE V6 did not show equal declines. The ES330 and Camry SE V6 were previously rated at 225 hp but the ES330 dropped to 218 hp while the Camry declined to 210 hp. The first engine certified under the new program was the 7.0 L
LS7 used in the 2006
Chevrolet Corvette Z06. Certified power rose slightly from 500 horsepower (370 kW) to 505 horsepower (377 kW).
Ref : Wiki
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Now can we get back to the original point ??<o
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