Subaru Robin Power Products Subaru EX27 - Manual (Page 15)

The higher efficiency of the overhead cam (OHC) technology translates to less unused fuel emitted by the engine .
• OHC – Improved combustion characteristics.
• Lower exhaust emissions.
• Reduced fuel consumption.
• Easily meets EPA Phase 3 and CARB Tier 3
emissions standards.
Exhaust Emissions HC = NOx
Subaru EX
Subaru EX
Competitor
Competitor
0 2 4 6 8 10 12 (g/HP-hr)
4 kW Class
6 kW Class
Lower Emissions
EX13
EX17
EX21
EX27
Competitor
Competitor
Competitor
Competitor
70 82 (dbA)
Operating dbA Levels
2 dbA
00 20k
Hz
20
60
dbA 3m
Competitor
Subaru EX17
3000 rpm
Noise/Frequency Measurement
What’s the benefit of 33 percent fewer moving parts?
Reduced Mechanical Noise
Subaru engines are a full 2 dbA quieter than competitive models. The noise reduction is most noticeable in the higher frequency range.
Fewer Parts
With fewer parts to wear and break, Subaru OHC engines outlast the competition.
Quieter Operation