Dyno Testing

At Tri Star Engines & Transmissions, each of our complete build-level high-performance engines are dyno-tested in-house for the highest quality and maximum performance. While other engine manufacturers test their engines on run-in stands (which does not verify performance or test the engine under any load), we made the investment to provide the most reliable option for your ride. If you purchase a complete build-level engine, you will receive your engine’s own specific dyno-sheet showing the maximum horsepower and torque your engine can experience!

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The term DYNO TESTING means that an engine is running under its own power coupled up to a controlled amount of resistance. The resistance is normally in the form of a water brake or an electric brake. The amount of resistance is typically measured in foot-pounds. Eventually we measure the amount of “power” coming from the engine.

Coming directly from the manufacturer of our system:

"Power, in mechanical terms, is the ability to accomplish a specified amount of work in a given amount of time. By definition, one horsepower is equal to applying a 550-pound force through a distance of one foot in one second. In everyday terms, it would take one HP to raise a 550-pound weight up one foot in one second. So to measure horsepower, we need to know force (in pounds) and velocity (in feet per second). DynoJet's inertia dynamometer measures power just in this way. The dyno calculates velocity by measuring the time it takes to rotate the heavy steel drum one turn. The dyno measures force at the surface of the drum by indirectly measuring the drum's acceleration. Acceleration is simply the difference in velocity at the surface of the drum from one revolution to the next. The force applied to the drum is calculated from acceleration using Newton's 2nd law, F=MA, (F)orce equals (M)ass times (A)cceleration. Power is coupled to the drum by friction developed between the driving tire of the vehicle and the knurled steel surface on the drum of the dynamometer."


Calculating Torque

"When an object rotates around a point, the object's speed of rotation depends on both an applied force and the moment arm. The moment arm is the distance from the point of rotation to where the force is being applied. Torque is the product of the force and the moment arm. For example think about trying to spin a drum by wrapping a rope around the drum and then pulling on the rope. If the rope is wrapped around a drum of one-foot radius and pulled with 550 pounds of force, the resulting torque is 550 foot-pounds. The torque on the dyno's drum can be calculated by multiplying the force applied by the drum's radius. However, engine torque is not equal to the dyno's drum torque because the gearing through the drivetrain changes the moment arm. The change in the moment arm is proportional to the ratio of engine speed to drum speed. Therefore, tachometer readings are necessary to calculate and display engine torque."

What you really need to know is that these things get loud! We run the engine as it would in a vehicle, but instead it’s inside of a 12x12 “Soundproof” box. We might be biased, but it’s one of our favorite parts of the job.

You can help fuel our passion for building these American Made, high performance engines by sharing your ride on our Facebook page!