14
votes
Accepted
Why do Internal Combustion Engines have specific "Firing Orders"?
There are multiple firing orders for some engine configurations, especially in the V8 realm. A Ford smallblock fires 1-5-4-8-6-3-7-2, while the same displacement modern modular Ford V8 fires 1-5-4-8-...
- 12.4k
10
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Why do Internal Combustion Engines have specific "Firing Orders"?
Firing order is constrained by:
crankshaft geometry
piston arrangement (inline, V, VR, flat, etc.)
These two factors will combine to determine when top-dead center (TDC) of each cylinder is achieved ...
- 39.1k
10
votes
Why do Internal Combustion Engines have specific "Firing Orders"?
It depends if you are asking from the point of view of an engine designer or someone trying to maintain or troubleshoot an engine.
From the point of view of a mechanic firing order tells you the ...
- 14.5k
9
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Accepted
What made Ferrari choose this particular firing order for their flat-plane V8's?
This is not an easy question to answer, but I will give it a shot. First off, a flat plane crankshaft means all journals are on the same plane, so if you looked at it straight on it would have all ...
- 779
8
votes
Accepted
Why is there no 1-4-2-3 Firing order?
It's because of the design of the crankshaft. If you look at the inline 4-cyl engine, the crankshaft is a flat plane crank, meaning the throws are 180° out. With that, two cylinders are on one side of ...
- 156k
6
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Why is there no 1-4-2-3 Firing order?
It's possible
But only if the crankshaft is cross-plane as opposed to the traditional flat-plane design which Paulster2 alluded to in his answer.
The diagram above shows a 1-4-2-3 firing order (...
- 39.1k
4
votes
Is there any benefit in performing a 4/7 swap on an LS engine?
No.
This modification is intended for Gen I/II Small-Block Chevy engines only.
What I failed to realize was that while the cylinder numbering convention stays the same across Gen I/II SBC's, the ...
- 39.1k
1
vote
1989 Chev. Cavalier Firing Order
In reference to your question, no, it won't work either way. In fact, it doesn't work either way. The thing is, the manufacturer has set the firing order for the 2.0L Cavalier 4-cyl engine (assuming ...
- 156k
1
vote
Accepted
Can a modified or non-fixed firing order yield a racing advantage?
If you are trying to change the cylinder firing order, I'd recommend against it, since the firing order helps prevent the engine from vibrating excessively.
Consider the Inline-6, which has primary ...
- 781
1
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Can a modified or non-fixed firing order yield a racing advantage?
The only thing I can think of is if you skipped cylinders which would "change" the firing order lets say from 12345678 to 10203040 where the 0's were the skipped cylinders. This would be paired with ...
- 2,879
1
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What made Ferrari choose this particular firing order for their flat-plane V8's?
The reason for this order is that a 4 cylinder isn't perfectly balanced, dynamically. Up and down is balanced (primary) but side to side (second order) is not. Balance shafts cancel out these ...
1
vote
Accepted
Is firing order sufficient to tell if a crankshaft is cross-plane or flat-plane?
If the firing order alternates from one bank to the other it could be (and probably is) a flat plane engine. If the firing order has any two cylinders on the same bank fire in succession, it cannot be ...
- 779
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