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Old 03-16-2016, 10:32 AM   #18
chicagoq
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City: Naperville
Join Date: Dec 2015
Posts: 45
I did some research on engine fuel consumption, I found at low rpm, bigger/smaller engines' fuel consumption are more or less similar. Take for example:
Yanmar 4JH5E, naturally aspirated, rated 53HP, burns about 3GPH at 3000RPM,
Yanmar 6LY3, turbo charged, 380HP, at 1600RPM it burns roughly 3.5GPH to produce 68HP
I read the data from the manufacture graph, so it's just a rough estimation

Is my above conclusion correct?

Also, I thought naturally aspirated engines are supposed to be less efficient, but from above data, it doesn't seem to have noticable difference? 6LY3 is more efficient by a small margin. I read somewhere turbo can get roughly 30% more power?
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