The NOx to PM ratio of the engine, calculated using the certified values for NOx and PM, must be at least 21.The engine must be certified to a PM emission level of at most 0.1 grams per brake horsepower hour (g/bhp-hr), and greater than 0.01 g/bhp-hr.The engine must not be certified to have an OEM diesel particulate filter (DPF).The engine may or may not be certified to have an original equipment manufacturer (OEM) diesel oxidation catalyst (DOC).The engine may or may not have exhaust gas recirculation (EGR).The engine must be used by an on-road motor vehicle with a manufacturer's Gross Vehicle Weight Rating of over 14,000 pounds.The following criteria must be met in order for appropriately retrofitted engines to achieve the aforementioned emission reductions: Highway model year 2002 through 2006 and have an engine family name listed in the Attachment A Technology specifications Engine Model/Application Criteria to achieve emission reductions.Otherwise I'd suggest using a Lego CAD tool such as LDCad. One advantage of the LDraw format, is that you can define 'building steps' and sub assemblies in the design, which makes the generation of complex building instructions easier.Ī tool for creating building instructions from a LDraw model, is LPub3D. This means that you may have to do manual edits to your model in order to have an (almost) complete translation into LDraw file format. ldr), but for some exotic (read: Technic) parts, the translation of LDD parts and LDraw parts is either incomplete or has problems with part orientation. You can translate an existing LXF file into an LDraw model (file extension. My experience with LDD and Technic models / MOCs is that you have good support for designing the completed model, but that for the generation of building instructions you're better off with other tools. The model usually doesn't require to have building steps as they are (always) automatically generated from the model.įor normal, non-Technic models, Lego Digital Designer (LDD) is able to create automated building instrutions. The LXF file contains the complete model as created with Lego Digital Designer (the Lego CAD tool from The Lego Company).

Lxf models