Sensors were installed to monitor every pressure, temperature, density, and bit of data that can be analyzed. On the dyno, a Banks ECU is used to control engines that are being tested, making easy fuel and timing adjustments possible for our L5P test. The excess exhaust volume is more than the turbo is designed to support, which hinders its ability and efficiency. One problem with the engine not having an EGR is that all the exhaust gases go directly into the turbocharger. Shortly after Gale Banks Engineering’s lead engine builder Mike Keegan finished reassembling the 6.6L Duramax L5P engine, the powerplant was mounted on the dyno (minus the EGR and catalytic converter, in order to see how the engine performs without those restrictions), ready to be put through its paces. And the best place to test an oil-burner is in the controlled environment of a dyno cell. The only way to truly understand everything is to test it. However, disassembly and rebuilding does not provide all the facts about what the engine can do. Tearing an engine apart and putting it back together can yield a lot of information about that powerplant, including how well or how poorly it is constructed. What Are the Limits of a Stock 6.6L Duramax L5P Engine?
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