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Question On Firing Order Of A Engine

K

KCTractors

Member
Location
Central Wi
This has me thinking, I have two tractors with this firing order, 1-2-4-3 with ccw distributor (Delco-Remy) but as the rotor turns starting #1, than #3, #4 and than #2. If the distributor turned cw, than it would be #1, #2, #4 and #3. What the heck is going on? They both run perfect!
445 Moline and a Ferguson TO-30.
 
In GENERAL, 4 cyl. engines have the 1-4-3-2 firing order (#1 at rad. end). Have no experience with any other, BUT, they can run in the sequence that you have, but will not have any power. Try swapping the plug wires to the 1-4-3-2 .HTH
 
(quoted from post at 20:51:42 10/11/16) This has me thinking, I have two tractors with this firing order, 1-2-4-3 with ccw distributor (Delco-Remy) but as the rotor turns starting #1, than #3, #4 and than #2. If the distributor turned cw, than it would be #1, #2, #4 and #3. What the heck is going on? They both run perfect!
445 Moline and a Ferguson TO-30.
Click to expand...
hat is basis for this part?, "I have two tractors with this firing order, 1-2-4-3 with ccw distributor "
Certainly at odds with "but as the rotor turns starting #1, than #3, #4 and than #2.", which sounds as though that is a personal observation. I would personally have confidence in my personal observation.
 
You is right, I was thinking wrongly. I claim OTD ! (and not thinking also, some beverage intake 'may' be part of it). ;^)
 
Hello KSTractors,


Yoy answered your own question. CW rotation 1-3-4-2, Ccw rotaion 1-2-4-3. Distribhtor wires stay the same, ditributor rotation determines firing order,

Guido.
 
If an exception to an inline four cyl exists, I do not know of it, but believe they will always be an end cylinder followed by one of the two inner cyls , then the other end, then the other of the two center cyls. Never end,other-end, one center, other-center.
 
I was just going to ask you if you were sure on that order.

Bottom line and engine can have ANY firing order, it depends on how the crank and cam are ground.

I think the most common is 1342, or 1243, 1 and 4 must be 360 apart, as with 2 and 3 for that crank grind.
 
From a fuel injection point of view I would like 1423, so I have adequate time to get fuel injection into siamese cylinders.
 
Hello. KCTractors,

Forgot to add that the firing sequence is determined by the camshaft. So the distributor firing order follows the camshaft's firing order.

Guido.
 
The crankshaft determines which pairs will up at the same time, camshaft determines the sequence.
 
Hello David G,

We are both saying that the camshaft determines firing firing order,

Guido.
 
The crankshaft says that 2 cylinders can be fired, the camshaft detmerines which one fires and which on exhausts.
 
most 4 cyl. engines have a firing order of 1342. and if you put the wires on in the wrong direction you would still have 2 cyl's firing, # 1 and 4 cyl would fire regardless. so what are u asking? i cant follow what u mean.
 
The distributor can turn either direction just have to change the plug wires around to match the firing order.

But you have to make sure the distributor is built to turn the direction it's turning due to the mechanical advance. If you have a distributor built to turn CW and turn it CCW it will retard the timing instead of advance the timing as speed increases so power will decrease as well. But both will idle just fine.
 
I used to modify older Ford 302 and 351W v8 engines, the engines had different firing orders.
A 302 camshaft would work fine in a 351W as long as you converted the firing order used by the 302.
 
I know of NO 4cyl that fires 1 and then 2 consecutively,that should narrow it down for you. Those Fergusons will run and start good with it backwards (just no power)I believe they are CCW rotation and should be 1342.
 
Hello Jon Hagen,

That is what I said, Do you remember the firing order?
Was it 1-3-7-2-6-5-4-8 That was also the firing order of the 400. Was it 2 and 8 or 3 and 5 you had to switch , it has been awhile I can't recall,

Guido.
 
Yup! Just had to look over to left side here to find that. Love to hear the original engineers theories for the difference.
 
Does the engine run right, or not?

If it runs good leave it.

If it doesn't run good fix it.

There's nothing to be confused about. If the distributor is firing 1-3-4-2, and it needs to be 1-2-4-3, then swap the 2 and 3 wires. Simple. Easy.

It's very common to get 2 and 3 backwards due to not remembering which way the distributor turns. Been there done that myself a couple of times.
 
Hello Jon Hagen,

Yep that looks right! The 351 and the 400 had the same firing order. There was one engine though were only two cylinders were swapped with a custom cam grind. I can't recall which engine though. Like you it has been years!

Guido.
 
Hello KCTractor,

But!!!! It created a lively discussion, all with the usual mix....

Here is one for you 1-3-4-2-1-3-4-2. Can you see any other firing sequence I listed below?

1-3-4-2 The most common sequence of events.

1-2-4-3 Not very common. Disavantage as 1 and 2 fire sequentially, creating uneven crank load.

1-3-4-2 Found on Yamaha bikes.

1-4-2-3. Rare but used on lager displacement low R.P.M engines.


1-2-3-4. This one is anecdotal used on high speed racing engines?


Guido.
 
Hello David G,

Not true on 2 stroke-cycle engines. What you wanted to say is that engine timing originates from the crankshaft? TRUE!

Guido.
 
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