What Is Sim Testing And How Does It Differ From Dyno Testing?

Dyno testing tests an engine while it is running to see how it operates under its own power. This means running and firing under fuel and with a load applied.

Sim tested (or simulation testing) is a test performed by all manufacturers of rebuilt engines and is often incorrectly referred to as Dyno testing. Sim testing uses a machine to spin the engine at roughly 750 RPMs. This allows us to test for compression, oil pressure, and noises. It also allows the engine lifters to be pumped up thus aiding in eliminating any startup tapping. The engine is not under its own fire or running on fuel at this point.

Sim testing is preferred because:

1. It costs less. Dyno testing would increase the cost of each engine up to $2,000.
2. It takes fewer man-hours. Dyno testing requires another eight hours, due to having to dress, run, and undress each engine.
3. It requires more equipment. Dyno testing requires a computer, harness, and fuel management system.

The Sim test provides an excellent baseline and allows us to weed out any mistakes made in the remanufacturing process.

Please feel free to contact us with any additional questions you may have.