Almost always at the crankshaft (or flywheel if you prefer) on an engine dynamometer. Sometimes a factor is taken for driveline to infer power at wheels, but it is a bit of a nuisance to measure on chassis dyno (those are mostly used for emissions/fuel economy drive cycles)
--- On Fri, 9/18/09, Stephen Humphreys <[email protected]> wrote: From: Stephen Humphreys <[email protected]> Subject: [USMA:45829] Re: Vehicle power in SI To: "U.S. Metric Association" <[email protected]> Date: Friday, September 18, 2009, 6:30 PM #yiv1277458699 .hmmessage P { margin:0px;padding:0px;} #yiv1277458699 { font-size:10pt;font-family:Verdana;} Being a car nut and a petrolhead that's a very minor issue. Minor compared to something that does my head in. Where the power is measured! At the wheels? or at the flywheel? ie - rolling road? or bench? (Or - if you like - on a rolling road but calculated for the flywheel) The fact that it could be either makes comparison a pain. Date: Fri, 18 Sep 2009 10:57:52 -0700 From: [email protected] Subject: [USMA:45827] Re: Vehicle power in SI To: [email protected] Kilowatts first is a step forward. On the other hand, the conversion doesn't seem quite right. It appears that they are using one of those dinky metric horses (0.7355 kW) rather than a real American (or British) horse (0.7457 kW). Metric horsepower might be judged a little deceptive in the US, as the number is slightly inflated. Although frankly a bigger issue is probably whether the 52 kW was measured according to SAE or ISO standards (mostly the reference tempererature, pressure, and humidity) --- On Fri, 9/18/09, STANLEY DOORE <[email protected]> wrote: From: STANLEY DOORE <[email protected]> Subject: [USMA:45826] Vehicle power in SI To: "U.S. Metric Association" <[email protected]> Date: Friday, September 18, 2009, 9:52 AM AutoWeekend (Sept 18) uses the SI first when telling about the Smart Fortwo Edition Highstyle car. For example it uses "52 kW/71 hp or a 62 kW/84 hp gasoline engine." It goes on to use only kW as the unit for power in the remainder of the article. That's progress. Stan Doore Have more than one Hotmail account? Link them together to easily access both.
