However, it is worth mentioning that such testing is far more accurate than it was in days gone by. Until the early s, it was considered standard practice to conduct such testing with non-production headers, and in absence of any belt driven accessories alternator , power steering pump , etc. However this practice has since been discontinued, to provide consumers with more accurate performance data. Read Also: What is a Spoon Engine? This phenomenon is regarded as drivetrain power loss and leads to obvious discrepancies between BHP and WHP measurements.
As a general rule, cooler air tends to be far more oxygen rich than warmer air. Because of this, cooler air is desirable when attempting to achieve optimal combustion. Therefore, an engine is less likely to achieve peak performance when operated in stifling heat, than when operated in more favorable temperatures. Maintenance Tips. Car Review. Car Comparison. Industry knowledge. Last updated Feb 08, Photo Source: speedhounds Wheel horsepower is measured at the wheels.
It is the inertia of a roller turned by the engine. Does not count the power loss caused by the gearbox and drivetrain. BHP does not sow the true horsepower going to the brake. Shows the true horsepower going to the wheels.
Measured by a tool named a Prony brake. Jiffy Lube has a great article on their website that explains this perfectly. Below is a quote that sums-up the altitude:. So what have we learned here today? Interested in learning more?
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