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Originally Posted by XRQTR
You're firing two cylinders simultaneously, even if it is half the fuel "per cylinder" it's the same amount of fuel as firing just one cylinder,
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I can see where you are coming from, but it's just not logical.
Your rule of thumb
only works when you are working with the same amount of capacity (a very large 5.4L 4 CYL or a 5.4L V8).
True, you are using the same amount of fuel for the 2 cylinders vs the 1.
And the air displacement is the same.
As your working on the theory that 2 cylinder's (8cyl) light at the same time, you would have a very very lumpy V8 that would need a huge heavy flywheel to take the crank over to the next firing. Because there are only 4 powerstrokes, not 8.
If you've done some engine work, you'd understand why a 4cyl has a heavier flywheel than an 8cyl.
Heavier flywheel would give it some massive torque, but not so sure on the HP/KW base.
However, going on the 4 Vs 8 in reality, the capacity (Volume) of air would be different. If based on todays engine sizes. 4Cyl vs an 8Cyl.
Thus giving you a leaned mix for the 2 cylinders (on the 8) and the right ratio (stoich) for the 4Cyl, that is if you are using the "same" amount of fuel on the one cyl (4cyl) as to the 2cylinders (8cyl).
In any case of displacement, it has to carry the right mixture (stoich).
If it's not stoich, then it don't run as well or at all. You can have a range of ratios from 12 to 16, but that's under engine operating ideals.
http://books.google.com.au/books?id=...um=2#PPA322,M1
I do remember the Mythbusters having trouble a few times getting the mixture of fuel to air right, on a few of their episodes (Exploding house using bug bombs and the Cell Phone Destruction) I think are good cases.