As far as I know the emission regs don't apply to stuff under 80 hp but I could be wrong.
I can tell you this... if I have a choice between an engine with DEF and an engine with EGR... I'll take the one with DEF every single time without a second thought. EGR is a nightmare that doesn't work and never will work on a diesel engine (reliably). With DEF you essentially have a Tier II engine with aftertreatment and Tier II engines were about as good as diesel's got in most respects.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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