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Random Question about Cylinder Numbers, Displacement and Gas Mileage

This is a discussion on Random Question about Cylinder Numbers, Displacement and Gas Mileage within the The Pit - General Discussion forums, part of the Website Forums category; Originally Posted by Monster I think I can answer your question. A 2L V12 will be extremely inefficient because of ...
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Old 12-18-2008, 02:13 PM   #11
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
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I think I can answer your question.

A 2L V12 will be extremely inefficient because of the low volume to surface area of the cylinder, so what you end up is excessive heat loss to the cylinder wall, and the thermal efficiency of the engine will be poor. Also because the cylinder is too small, you can not really inject useful amount of fuel to get useful amount of work done. Also because of the small cylinder, circumference will be too small to place a 4 over head valves above the cylinder. The volumetric efficiency of the engine will be reduced, and the combustion will not be optimised.

The most efficient cylinder size is 500cc, and a lot of high performance car engines have that specific cylinder size, eg the 6.0LV12 from BMW, the 8.L W16 from the Veyron, and a 2.L 4 cylinder engine from various manufacturers.


For engine analysis, we analysis each cylinder individually, and not all together, and fuel consumption is measured in kg/s. A 2L V12 will be too inefficient to achieve the same mileage as a 2L 4 cylinder. Feel free to ask me more questions.
Wow thanks for the great answers (marintbo too)

So (essentially) even though two engines have the same displacement, and can theoretically take in the same amount of fuel per RPM, their gas mileage won't necessarily be equal because the total efficiency of the engine may suffer?
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Old 12-18-2008, 06:48 PM   #12
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
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Wow thanks for the great answers (marintbo too)

So (essentially) even though two engines have the same displacement, and can theoretically take in the same amount of fuel per RPM, their gas mileage won't necessarily be equal because the total efficiency of the engine may suffer?
Yes indeed.
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Old 12-20-2008, 11:55 AM   #13
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
could a mod please delete this!
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Last edited by VroomVroom; 12-20-2008 at 05:48 PM. Reason: Save confusion!
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Old 12-20-2008, 02:07 PM   #14
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
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^ Please just Ban him please!

We are getting so much spam lately
Who..?

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Old 12-20-2008, 05:35 PM   #15
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
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who..?
+ 1
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Old 12-20-2008, 05:37 PM   #16
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
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^ Please just Ban him please!

We are getting so much spam lately
I vote Monster stays!!!
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Old 12-20-2008, 05:45 PM   #17
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
Intersting stuff. Didn't Porsche have a 3.0L 4-cylinder in the 90's era 944 or 968?

Mazda also had a very small, like 2.3L V6 in one of their 90's models too, a hatchback I think. The Mazda Millenia also had a smaller V6, like 2.2 liters or something run on the Miller cycle. Interesting cars they were.


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Old 12-20-2008, 05:47 PM   #18
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
Thanks Admin

Sorry everyone! there some a newbie who was advertising "Shoe-trader".

So hes now been banned and the post had been deleted I was pointing to


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Old 12-20-2008, 08:54 PM   #19
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
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One thing I haven't been able to find an answer to is this: would a 2 Litre V12 (think old time Ferrari) have the same gas mileage as, say, a 2 Litre 4 cylinder engine?

Conceivably they would, especially given that their displacement over a period of time 'could' equal out. If one piston going around the crankshaft equals 1 rpm in the 4 cylinder engine, and three cylinders (firing simultaneously or in sequence) make up 1 rpm in the V12, then they would both end up taking in the same volume of air/fuel, and so consequently use the same amount of fuel per mile....right?

Any engineers out there?
A 2 litre V12 2ill have poor gas mileage wrt a 2 litre 4 cylinder engine. However the 2 litre V12 will smoother and rev better and higher than the 2 litre 4 cylinder.
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Old 12-21-2008, 07:02 AM   #20
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Re: Random Question about Cylinder Numbers, Displacement and Gas Mileage
Good to see everything has been sorted out.
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