Coose
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| posted on 18/3/08 at 04:13 PM |
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Deleted because I just really can't be bothered any more. No really, I just can't.....
[Edited on 18/3/08 by Coose]
Spin 'er off Well...
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matt_claydon
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| posted on 18/3/08 at 05:10 PM |
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To put it another way, look at the animation here: http://www.cybersteering.com/cruise/feature/engine/engine.html
This is a 1243 engine and the firing order is 1243 no matter which end of the engine you call the front. There is no way this pattern can be described
as "1342".
Dynamically the two are absolutely identical though (in terms of balanced and unbalanced forces and moments) and there are thereofre no mechanical
advantages of one over the other.
Edit: the tables at the bottom of that page show the fundamental difference. A line in the top table eg ICEP does not appear at any point in the
bottom table which ever way along the rows you read.
Top table is 1342, bottom is 1243.
[Edited on 18/3/08 by matt_claydon]
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t.j.
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| posted on 18/3/08 at 07:53 PM |
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The Fiesta or KA sound is always around with 1243. That are really tough engines. So no problem. Maybe for balance, cooling, exhaust you could choose
a different firing-order.
But I prefer logical: 1342
Please feel free to correct my bad English, i'm still learning. Your Dutch is awfull! :-)
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thomas4age
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| posted on 19/3/08 at 05:33 PM |
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regarding the exhaust an the desing of the primaries and the order in which they enter the collector you'd just need to make sure, that the
pulses line up to aid scavenging from the cylinders.
for both firing orders discussed the orderof collector entry is the same, the target is to recieve the exhaust pulses into the collector in an orderly
fashion ie 180 degrees appart
when firing order is 1-2-4-3,
cylinder:
1 needs to be next to 4
2 needs to be next to 3
4 needs to be next to 1
3 needs to be next to 2
when you make the same list for the firing order 1-3-4-2.
cylinder
1 needs to be next to 4
3 needs to be next to 2
4 needs to be next to 1
2 needs to be next to 3
You'll get the same list of the only thing is that the 4 ports on the collector fed in reverse order of the first firing order, which is the
same thing as phisicly rotating the collector 180 degrees. taking the headers with it (IE twisting it around)
they both end up being 180degrees systems. think of the cylinders as 2 pairs. outer two running 360 appart and the inner 2 also running 360 appart,
in other words the reason for the difference in engine note cannot be this change in firing order. unless the exhaust system is phisicly different in
desing.
grtz Thomas
[Edited on 19/3/08 by thomas4age]
If Lucas made guns, Wars wouldn't start either.
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