Without knowing the details, like permitting limits and current status of the engine emissions, it’s hard to give specific help. Don’t rely on those handheld testers for your emissions information. An easy way to tell is to ask the guy using it when the last time it was calibrated. Formal testing, using much more sophisticated analyzers, requires calibration before, during and after testing. I would recommend getting a testing company with engine experience to monitor and tune to the best it can be. Have all the maintenance on the engine done before hand. Increasing the air and/or lowering the fuel pressure are a couple tricks to reduce emissions. I had plenty of customers tune to get passed the testing, and just put it right back where it was after I left the site. I didn't get a cut of the DEP fine money to turn people in. One problem I see with the crusher is the varying load. It’s running at its best maxed out. Most testing requires 90 to 100% load, not just RPM, but load, that is calculated by fuel consumption from manufacturer specs, for the duration of multiple one hour test runs, and average emissions for one hour to be less than the permit limit. If you’re still having trouble meeting the standards I think that a three-way catalyst might be the answer. None of this will be cheap and it might take the new Tier4 engine to fix this. Sorry… But there aren’t any easy answers when it comes to the EPA/PADEP.
