Calling all engineering geniuses....
12-06-2010, 10:26 AM
#1
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Calling all engineering geniuses....
Cold air!
These last few weeks my car has been an absolute peach to drive (mechanically speaking) and has oodles of power and seemingly torque.
I am guessing this is all thanks to the cold damp air.
My question is, at 9k rpm, what volume of air is sucked in by the S2k engine per minute.
(i.e. If I wanted to keep a bag of this cold air in my freezer for the summer when I actually have grip, how big a freezer would I need assuming I was at max revs for the whole 40 min journey?*)
I know it's a ridiculous question but I'm curious....
If only we had under-road heating in this country!
* Yes, I know it's a ridiculous assumption to be at 9k rpm for the whole journey but no more ridiculous than the actual question itself.
These last few weeks my car has been an absolute peach to drive (mechanically speaking) and has oodles of power and seemingly torque.
I am guessing this is all thanks to the cold damp air.
My question is, at 9k rpm, what volume of air is sucked in by the S2k engine per minute.
(i.e. If I wanted to keep a bag of this cold air in my freezer for the summer when I actually have grip, how big a freezer would I need assuming I was at max revs for the whole 40 min journey?*)
I know it's a ridiculous question but I'm curious....
If only we had under-road heating in this country!
* Yes, I know it's a ridiculous assumption to be at 9k rpm for the whole journey but no more ridiculous than the actual question itself.
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12-06-2010, 10:57 AM
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Ok I'll use 10:1.
I can't find the density of air (i.e. increase in O2) when it is cold at 0C, so going to use standard figures when it is 15C.
If you can find the percentage of O2 at 0C then I will modify my calculation!
I can't find the density of air (i.e. increase in O2) when it is cold at 0C, so going to use standard figures when it is 15C.
If you can find the percentage of O2 at 0C then I will modify my calculation!
12-06-2010, 11:02 AM
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Question the Question -
Do you mean the physical volume (ie. how many cylinders full of air (less volume of fuel injected) or do you mean the volume of air now that it's cold, vs an average air temp (so adding the relative densities into the mix)
Oh and to confirm your guess - you're (half) correct - the cooler air is denser and so contains more oxygen, therefore a bigger bang per cylinder of air because there are more O2 particles to combust.
The dampness doesn't really have anything to do with it, unless you run a turbo car, in which case the dampness will give extra cooling on the intercooler (a'la when you get out of the shower and you're damp) - thus cooling the air further - it's like a natural water injection (as seen on the Evo IX, I think)
Do you mean the physical volume (ie. how many cylinders full of air (less volume of fuel injected) or do you mean the volume of air now that it's cold, vs an average air temp (so adding the relative densities into the mix)
Oh and to confirm your guess - you're (half) correct - the cooler air is denser and so contains more oxygen, therefore a bigger bang per cylinder of air because there are more O2 particles to combust.
The dampness doesn't really have anything to do with it, unless you run a turbo car, in which case the dampness will give extra cooling on the intercooler (a'la when you get out of the shower and you're damp) - thus cooling the air further - it's like a natural water injection (as seen on the Evo IX, I think)
12-06-2010, 11:06 AM
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its swept volume not cc so slightly less than 2ltr per rpm and thats not taking into account losses in the intake or gains through scavange and ram
edit do they count the cylinder head when stating the engine capacity or do they use swept volume? never though about this before
edit do they count the cylinder head when stating the engine capacity or do they use swept volume? never though about this before