Create an account CBX Home ·  Topics  ·  Your Account  ·  Honda CBX Forums  


Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.

Lost your password?

Main Menu

 CBX Forums
 CBX Technical
 Photo Gallery
 CBX Registry
 Just For Fun
 Member Map

Who's Online

Welcome, Anonymous

· Register
· Lost Password
People Online:
Visitors: 44
Members: 2

We received
page views since
May 2003

Server Date/Time
5 December 2021 15:25:06 EST (GMT -5)

Feature Site

Posted on Tuesday, November 18 @ 09:39:52 EST by administrator

Technical There are basically two differences between a DIN and a SAE horsepower rating: One difference is in the parameters for a measurement: Horsepower is defined as work done over time. One SAE horsepower is the amount of power necessary to lift 550 pounds 1 foot in 1 second, or 33,000 lb.ft./minute. One DIN horsepower is the ability to lift 450000 kg one cm in one minute. For the same power the SAE measurement is thus 98.629% of the metric DIN measurement. 100 SAE hp = 101.42 DIN hp = 74.6 kW If you see the term bhp, it just means "brake horsepower", which is the actual usable horsepower delivered to the rear wheels of the car. It is so named because a brake is applied to determine how much pressure is needed to stop or absorb the power. Bhp could reference either DIN or SAE horsepower. Often, however, brake horsepower is measured with no load from a chassis or any accessories attached to the engine whatsoever. It’s also called gross horsepower. In vehicles, torque measures the turning force generated at the wheels. A high horsepower rating generally indicates the ability to sustain higher top speeds, while torque signifies a vehicle's acceleration and ability to pull heavy loads. Horsepower is effectively torque times rpms, with the exact formula being HP = Torque x 2 x Pi x rpm (Pi=3.1416…) so if you keep the same amount of torque and double the revs, you double the effective horsepower. This is why most engines have the highest horsepower rating at higher RPMs. And along those lines, you can have an engine that has lots of horsepower at higher RPMs, but not much energy at lower RPMs where it counts off the line, so often torque ends up being a more interesting measurement than horsepower. The other difference is in the engine configuration for the test: While DIN (Deutsche Industrie Normen) 70020 and thereunder DIN 6270 requires the efffective HP to be measured on an engine in standard production configuration, i.e.: with stock intake and exhaust, fan and waterpump or cooling blower, fuel pump, fuel injection pump and no electric load alternator, in the U.S.,vehicle manufacturers can test for horsepower and torque in a variety of ways. SAE J1349 Engine Power Test Code – Spark Ignition and Compression Ignition – Net Power Rating Standard specifies a basis for net engine power rating, and a method for determining net full load engine power with a dynamometer. A dynamometer places a load on the engine and measures the amount of power that the engine can produce against the load. The current test, which originated in the early '70s and was last reviewed in 1995, allows OEMs to claim horsepower and torque figures higher than what most owners will actually experience. The SAE –Society of Automotive Engineering - Power Test Code Committee , is currently revising its standard for measuring horsepower and may suggest that OEMs have an independent observer verify the numbers they claim for horsepower and torque. The standard will also set a procedure for how to test torque, which is also heavily advertised by car manufacturers. According to SAE, the revised standard is expected to be written by the end of 2003. An SAE advisory committee will then decide whether to adopt the procedure and the use of outside witnesses, such as Underwriters Laboratories Inc., to verify OEMs' claims.

Related Links
· More about Technical
· News by administrator

Most read story about Technical:
New CDI MPS-200 OKI system

Article Rating
Average Score: 4.53
Votes: 15

Please take a second and vote for this article:

Very Good


 Printer Friendly Printer Friendly

Theme Graphics By Ian Fox

All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest 2002 by me

PHP-Nuke Copyright © 2004 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.