Total Motorcycle Community Forums

Message

vega44 · #1 Unread post by **vega44** » Wed Nov 23, 2005 10:33 am

what does bhp mean???

#2 Unread post by **Sev** » Wed Nov 23, 2005 10:45 am

I always thought it was brake horsepower. Or the HP that is generated at the wheel, as opposed to at the crank where you haven't lost any in the drivechain.

DivideOverflow · Wed Nov 23, 2005 12:03 pm

bhp is brake horsepower... It refers to the brake dynamometer, the device for measuring the true power of the engine. Stating power in 'bhp' gives some indication that this is a true reading, rather than a calculated or predicted one. However, it does not tell where the power reading was taken — at the flywheel, transmission or drive wheels.

Most of the time, manufacurers will test at the crank and call it bhp. If you see it from a manufacturer, it is safe to assume that it is measured from the crank, and does not include drivetrain losses. I haven't known any manufacturers to actually test from the wheels.

shane-o · #4 Unread post by **shane-o** » Wed Nov 23, 2005 12:16 pm

DivideOverflow wrote:bhp is brake horsepower... It refers to the brake dynamometer, the device for measuring the true power of the engine. Stating power in 'bhp' gives some indication that this is a true reading, rather than a calculated or predicted one. However, it does not tell where the power reading was taken — at the flywheel, transmission or drive wheels.

Most of the time, manufacurers will test at the crank and call it bhp. If you see it from a manufacturer, it is safe to assume that it is measured from the crank, and does not include drivetrain losses. I haven't known any manufacturers to actually test from the wheels.

your prolly right but im sure ive seen manufactures getting all excited by dyno results, or maybe not

DivideOverflow · Wed Nov 23, 2005 8:33 pm

they usually dyno the engine by itself. it makes their numbers look better.