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How An Engine Dyno Works

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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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Опубликовано:

5 сен 2024

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Комментарии : 30

@RedOctober2011 4 года назад

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.

@jerrycallo 3 года назад

Yeah, I was in the comments of another youtube video and they were arguing that "you measure torque and calculate power, oh no you don't you measure horsepower it's not calculated". Strain gages popped into my mind so I ended up here. You measure force and calculate both torque and horsepower. It's amazing what uninformed people think.

@abieodell4148 2 года назад

Ofn it took me 10 videos to find this Mf lmao 😭😭😭😭😭

@jaykaygxd8497 3 месяца назад

Always trust the videos with mechanical animations that come across like a power point presentation, these types never fail to inform

@kingdrizzy8939 2 года назад

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.

@eriklarson9137 Год назад

Poor guy. He fell victim to the producer of the show no doubt. This style of "production" needs to die off already. There are a thousand channels producing better comment with no stupid forced lines and terrible acting.

@chevy6299 5 лет назад

Glad you got the problem worked out so the video can be viewed.

@zontetaji506 Месяц назад

Thank you for the knowledge

@steviesteve750 3 года назад

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.

@eriklarson9137 Год назад

Rep from the biggest company or S R in the comments section... Hmm... Tough decision.

@vairavel2420 2 года назад

Very useful simulation video

@jerrycallo 3 года назад

I'm not saying Pat's a nerd or anything, but look at all that stuff in his pocket protector.

@semihsenyuz7436 3 года назад

Wonderfull

@LuisGonzalez-vx1oo 2 года назад

A Dyno test is different than a Dyno tune ?

@t.s.racing 2 года назад

Yes Luis. A test can literally be 1 pull or run to record the torque and then calculate horsepower with a correction factor. The new dynos like you see do this instantaneously. A tune is many runs or pulls, and on my dyno I monitor exhaust gas temperature or E.G.T., Air fuel ratio or A.F.R., the B.S.F.C. which is brake specific fuel consumption, and I always monitor knock sensors too. You might have 10 pulls just for optimal ignition timing alone. Turbo/blower/nitrous can have a handful other parameters to monitor and adjust or compensate for. Remember Sir, the best engine builders in the world, still READ SPARKPLUGS. Read that again. The ground strap will tell you about your timing, the porcelain will will tell you about the wide open throttle fuel mixture. Not on the end of the plug, but deep down inside on the porcelain. And even a million dollar dyno can't read what the plugs understand. T.S. RACING

@albunog1513 Год назад

Shouldn't the torque reading be measured in poundals?

@lukeperry085 Год назад

Torque is measured in lb/ft (which I believe is what you were trying to say). There are really 2 aspects to this measurement: - Pounds (how much force is being applied to the load cell?) - Feet (how far from the center of the axis of rotation is the measurement being taken?) When it comes to calibration of a dyno, you calibrate the load cell with simple weight. The length of the torque arm (or length off center of axis) is a factor that the system knows as well, and uses this along with the output of the load cell to calculate a number that's a in lb/ft. Hope that makes sense.

@mvmcali6900 2 года назад

Can a dyno like this calculate engine efficiency as well as power output? That is...can it measure how much of the energy is wasted in heat?

@andresmartinezramos7513 Год назад

If you know the power output of the engine, fuel flow rate and energy density of the fuel. You can calculate thermal efficiency.

@philbytheriver 3 года назад

So, now that you know what it reads, how do you improve on it?

@eriklarson9137 Год назад

Pizza.

@MegaJohnhammond 5 лет назад

"Calibration is a matter of faith" Jesus Fucking Christ, I'll tell that to my AS9100 auditor this year and see if he shits his pants.

@vibrantalien430 3 года назад

What costed you for whole setup? Thanks, reply is appreciated

@eriklarson9137 Год назад

@stevemitchell2252 4 года назад

Simple horsepower is rpm X torque ÷ 5252

@kylewaddington1983 Год назад

Is hard to learn to drive it ?

@Jrod_FPV Год назад

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.

@insAneTunA 10 месяцев назад

Anyone can buy calibrated weights online from a company with a proven reputation that is specialized in calibrated weights for industrial purposes. Those cost a lot more as the weights that you see in the gym, although they might look the same. The only difference is that the calibrated weights are fine adjusted to a specific weight at a specific temperature with a specific guaranteed tolerance.

@craigmonteforte1478 2 года назад

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