Tier 3- Tier 4 - EPA Policy
Don't know if it's still in place or not, but Mil Stack is claiming on their stack wagons that they can be tier 3 as long as they sell less than 300 units a year...
Since I do this for a living, I assume I can talk with some authority.
USA EPA runs TPEM program, which regulates what Tier and when can be sold. See attached a copy from EPA presentation.
130-560 Kwt (173 hp - 746 hp). Program ends in 1 week - Dec 31, 2017. Manufacturers are not allowed to stock beyond "reasonable". So beyond limited engines in stock, the program is finished for this power category.
If there is a new manufacturer who did not participate in TPEM before, than can use "delayed" allowances till 2020, selling Tier 4i engines.
56-130 kWt (75-173 hp). Program end in 1 year: Dec 31, 2018. Tier 3 is allowed till than.
If there is a new manufacturer who did not participate in TPEM before, than can use "delayed" allowances till 2020, selling Tier 4i engines.
Hope this helps clarify the issue.