With Engine Power’s new dyno cell, Cell Block D, successfully installed it’s time for Bret Williamson from SuperFlow to update the actual dynamometer. But before we dive into the upgrades, let’s run over how an engine dyno works.

The twisting an engine makes is called torque. To measure it accurately, the dynamometer acts like a giant water break. The engine’s crankshaft gets connected to the dyno’s impeller housing and water inside the housing creates resistance making it hard to turn the crankshaft. This heats up the water and puts a serious load on the impeller housing as it literally tries to rotate off the dyno’s frame. A force transducer bolted between the housing and the frame measures the rotational strain which the computer translates into torque and horsepower measurements. The hot water gets pumped back to the main storage tank for re-use. While most of the dyno’s water is used to absorb torque, some of it regulates engine temperature which makes for an accurate, efficient, and consistent dyno test system.

The Powermark absorber is a twin-rotor design that also uses an inlet and outlet valve. The advantage is that if you’re testing over a wide range of RPM, it lets you adjust for that so you can run the engine at whatever you want. SuperFlow’s Powermark Dynamometer can monitor a whopping 139 channels of engine data. And while the Engine Power doesn’t need that much, Bret did set the guys up to measure boost level. On the console side of the setup, the software is updated.

Before the dyno’s first use it needs calibration. Four hundred pounds of weights were hung to check the accuracy and the software was calibrated. Calibration is a matter of faith. If calibrating frequently is something you prefer, otherwise you can leave it alone until the day you think the numbers are wrong and then add the weights and check.

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19 thoughts on “How An Engine Dyno Works”
  1. i wonder how they calibrate the actual weight of those bench press weight plates? Weight room plates are notoriously inaccurate, for example, just because it says 45lb in big bold letters on the plates, doesn't mean it's actually 45.00 lbs.

  2. the funniest Dino video i’ve seen is the the one that Vic Edelbrock did with his daughters in the Control Room watching and they Pranked the girls as the test got more serious and the engine was roaring they wanted everyone to listen carefully for any strange noise or possible f signs of failure and someone quietly walked in with a metal Cookie sheet and some Wrenches as the tension built up they banged very loudly on the cookie sheet and it scared the Crap out of the Girls who figured out they were Pranked right away and laughed about it with everyone else it was obvious they had all worked together for many years i forget who’s motor they were testing or why but it was a important one for Edlebrock and something the daughters were very involved in

  3. As an engineer i must say that 'calibrating when you think the numbers are wrong' is just silly. For any peice of machinery or tooling in use, calibration checks should always be done regularly and atleast checked before use lol.

    Its called sensor drift.

  4. Calibration most certainly is not something you do when you "think" the numbers are wrong, as by then a plane probably fell out of the sky. The whole point of managing uncertainty is that you are confident of how big it is.

  5. I had to watch 8 videos on how a dyno works, none of which explained how a dyno works, to finally find this one, which actually explains how a dyno works. The graphics are perfect. They tell me exactly what I wanted to know. A turbine spinning water is connected to a block of metal with a strain gauge on it. The water is recycled from a tank. All the other videos are titled "How a dyno works" but they just show "what a dyno tells you", or they say "it measure x and transmits that data to your computer". Useless info. We all already knew that. Thanks for the great video.

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