Jump to content
SAU Community

Bhp & Hp

Recommended Posts

Brake horsepower is the flywheel power measured at the brake on a an engine dyno. Brake horsepower was an SAE standard until 1971 or so. It measured flywheel horsepower of an engine without running any accessories.

From 1972 onwards, SAE net horsepower was used, this was measured at the flywheel running all the engine accessories and through a full exhaust system and produces a slightly lower figure. This was still called BHP and is the current SAE standard.

Many horsepower figures now are rear wheel horsepower which takes into account losses through the drivetrain and is measured at the brake on the chassis dyno. You typically lose around 20ish% of BHP on a chassis dyno, it varies quite a bit depending on the type of drivetrain.

There are a few different standards for measuring power and unless you are racing dynos it doesnt really matter. As long as you can measure changes on the same dyno it doesnt really matter if it reads in buckets of fish.

Basically, 1 HP is the amount of energy required to lift 550 pounds one foot in one second.

SAE (Society of Automotive Engineers) BHP is the power of an engine measured at the flywheel on an engine dyno.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Latest Posts

    • I try to play a couple times a week, but yeah life man, stops you from gaming all the time  
    • I drove back-to back a B250 (i think it was 2015-2016) and my 2015 BMW 225i Active Tourer. $10k cheaper than the hatches, so got more interior space and top spec, loads of power for FWD etc. B-class = felt real cheap inside, gearbox was weird. So insta-bought the BMW because it was nicer to drive (torque converter auto) and interior was nicer. Not bad for $20k just as COVID lockdown hit (cheaper than any Japanese/Korean hatch weirdly, although a couple years older). Thankfully mine only beeps when it detects cars (no active assists), the "driver assists" are never good (makes sense when you're busy staring at your phone while you drive I suppose). tl;dr- B-series and Active Tourer are underrated (basically GLB/X1 without the extra bulk). Apologies for the rant.
    • R33 Skyline chassis manual in english hard to find $60 Mike 0422192668
    • Alpha omega racing brembo dogbones suit Skyline S14 S15 these are to fit evo 6, 7, 8, 9 Brembos with evo 10 disc on S14 S15 Skyline R32, R33, R34 and Z32 300zx includes dogbones and all bolts brand new cost $600 Mike 0422192668
    • Yeah looks like we have to do some upgrades 😔
  • Create New...