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how much fuel does a 250cc engine consume per minute? Answered

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user
frollardBest Answer (author)2011-12-07

***WARNING***
LOTS and LOTS of assumptions in these calculations, but I figure pretty close.

250cc engines at 3600rpm put out what I found on the net to be about 7-8hp.

on the high side, say 10hp

10hp is about 7500 watts.

A watt is a joule-second.

that's 7500 joules/second, or 450kJ/minute

Wikipedia says:
"Gasoline contains about 35 MJ/L (9.7 kW·h/L)"
and
"most engines retain an average efficiency of about 18%-20%"

so to output 450kJ/minute the engine has to consume about 2.25MJ of gasoline/minute (wastes 1.8MJ/minute as heat)

Gasoline @ 35MJ/L and engine consumes 2.25MJ/m =
35/2.25 = 15.6 minutes/liter or 0.0643 Liters per minute.

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user
lemonie (author)2011-12-07

At what RPM?
With what fuel?
What type of engine?

L

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user
lohithg (author)lemonie2011-12-08

at RPM of 4000 and the fuel is diesel and it is a four stroke engine

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user
lemonie (author)lohithg2011-12-08

If it's a specific engine could you name it?
What I should have thought to ask is "what output horepower?" See, 4000 RPM on "engine only" won't consume the same amount of fuel as 4000 RPM at full load in "drive".

L

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user
lohithg (author)lemonie2011-12-09

I am not willing to know the fuel consumption of a specified engine but the average consumption of diesel per minute.

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user
lemonie (author)lohithg2011-12-10

You got a good answer from Frollard, I hope that's done for you there.

L

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user
Burf (author)2011-12-07

Not enough information:
Two stroke or four?
3.5 HP work duty engine or 45 HP motocross screamer?
Constant load or variable power output?
Fuel type?

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user
rickharris (author)2011-12-07

So much depends. This isn't really possible to answer.

Look up some motor bike fuel figures.

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