EGR vs SCR

http://www.busmania.com

Starting Euro 4 reguration at 2008 in South Korea. There are big change at buses. there are 3 bus maker and 2 engine maker in korea. Hyundai and Kia motors use hyundai's powertec engine and daewoobus use doosan's DL, DV engine.

Hyundai's powertec engine is taking EGR system, but Doosan's DL, DV engine is taking SCR system.

Official opinion of 3 bus makers.
1. Kia : our bus, granbird is lighter than hyundai's bus(universe). so granbird is better fuel consumption.
2. Daewoobus : our bus taking SCR system. so more poewrful and good fuel consumption. over 5~10% than Euro 3 engine.
3. Hyundai : our egr system optimized our buses. and sub items of engine show more efficiency. so our engine's performence is good.

There are data sheet of road test. but it is very sensitive. so we do not open that data.
If you want, send e-mail.