AJP Firing order

[g20v6]

Can one of you helpful chaps tell me the correct cylinder firing order on the ajp please.

Many thanks Simon

[JensenA]

Take a look here.....

Firing Order

[Tony69]

I have attached an image detailing the ignition lead layout/firing order for you.

From the recent work I did on my Cerbera - 1997 4.2 AJP v8

regards

Tony.

[jesfirth]

thanks guys - the leads are on correctly so why after I moved the frigging coil packs is the engine now running rough and the odd bank coil pack overheating and literally smoking within 30 seconds of firing up the engine?

[methodwares]

Sounds like an internal short. Is the 'feed' connector on backwards?

[M3John]

Hi guys, bit of a thread resurrection i know but was just wondering (well assuming actually) that this firing order is the same for a 4.5? I can't see any reason as to why it should be different.

M3J.

[Rawhide]

Bounce. Does anyone know the firing order of a 4.5?

[Jimii]

Same as above mate

[SporttiJanne]

I cannot figure out the firing order from the picture above.

So, which one it is? 1-6-3-2-7-4-5-8 or 1-4-5-2-7-6-3-8 ?

[Jimii]

edit i actually have no idea

Edited by Jimii on Tuesday 7th February 10:13

[tvrgit]

SporttiJanne said:

I cannot figure out the firing order from the picture above.

So, which one it is? 1-6-3-2-7-4-5-8 or 1-4-5-2-7-6-3-8 ?

I don't know what the order is, but if Tony's diagram above is correct, then it can't be either of those two. Tony's diagram suggests that the firing order for the left bank is 1-3-5-7, and for the right bank, 2-4-6-8. Neither of those two you've quoted have either bank firing in the right order.

[pacman1]

I'm none the wiser, but now understand which numbers are odd and which are even!

[Tanguero]

The diagram is (possibly!) nothing to do with he firing order. It is just the position of the plug leads on the coils.

ETA Uncertainty in view of later comments

Edited by Tanguero on Tuesday 7th February 11:49

[tvrgit]

Tanguero said:

The diagram is nothing to do with he firing order. It is just the position of the plug leads on the coils.

Am I being misled by the arrows showing direction of rotation (although I know there's no rotor arm!) that suggest a sequence for each coil?

[Tanguero]

tvrgit said:

Tanguero said:

The diagram is nothing to do with he firing order. It is just the position of the plug leads on the coils.

Am I being misled by the arrows showing direction of rotation (although I know there's no rotor arm!) that suggest a sequence for each coil?

Maybe I am misled too, but it looks to me simply that it shows the fitting order for the leads. I would not expect the firing sequence to be simply front to back on both banks, which is what the arrows would imply if that was what they indicated.

[tvrgit]

Tanguero said:

tvrgit said:

Tanguero said:

The diagram is nothing to do with he firing order. It is just the position of the plug leads on the coils.

Am I being misled by the arrows showing direction of rotation (although I know there's no rotor arm!) that suggest a sequence for each coil?

Maybe I am misled too, but it looks to me simply that it shows the fitting order for the leads. I would not expect the firing sequence to be simply front to back on both banks, which is what the arrows would imply if that was what they indicated.

I wouldn't normally expect that either, but that IS the firing order on a Ford V6, for example - left-right, front to rear both banks... so even though it doesn't make sense for a V8, my addled brain can't necessarily rule it out.

[Mark.]

tvrgit said:

Tanguero said:

tvrgit said:

Tanguero said:

The diagram is nothing to do with he firing order. It is just the position of the plug leads on the coils.

Am I being misled by the arrows showing direction of rotation (although I know there's no rotor arm!) that suggest a sequence for each coil?

Maybe I am misled too, but it looks to me simply that it shows the fitting order for the leads. I would not expect the firing sequence to be simply front to back on both banks, which is what the arrows would imply if that was what they indicated.

I wouldn't normally expect that either, but that IS the firing order on a Ford V6, for example - left-right, front to rear both banks... so even though it doesn't make sense for a V8, my addled brain can't necessarily rule it out.

It's not impossible, it could also be the reason they sound like the do. However, we are told the flat plane crank is effectively 2 straight 4's bolted together, so if you were to separate them, then individually, they couldn't run. But then they are not separated so......

[Tanguero]

tvrgit said:

Tanguero said:

tvrgit said:

Tanguero said:

The diagram is nothing to do with he firing order. It is just the position of the plug leads on the coils.

Am I being misled by the arrows showing direction of rotation (although I know there's no rotor arm!) that suggest a sequence for each coil?

Maybe I am misled too, but it looks to me simply that it shows the fitting order for the leads. I would not expect the firing sequence to be simply front to back on both banks, which is what the arrows would imply if that was what they indicated.

I wouldn't normally expect that either, but that IS the firing order on a Ford V6, for example - left-right, front to rear both banks... so even though it doesn't make sense for a V8, my addled brain can't necessarily rule it out.

While I can't be completely certain my recollection from the last time I had the covers of to do the valve clearances is that the order that the valves closed on the compression stroke, hence the firing order on a bank, was 1st-3rd-2nd-4th, which I guess would make the full order across banks something 1-2-5-6-3-4-7-8 however I don't know what the interbank timing is.

[SporttiJanne]

The picture above seems to be about fitting the plug leads, nothing to do with the actual firing order.

According to this animation, the sequence cannot start 1-2-...
http://www.projectm71.com/Flatplane.gif

[FarmyardPants]

Looking at the right bank, 6 can't follow 4, they are on the same but of the crank.

I would expect the even order to be something like 2,4,8,6 (ie up,down,up,down as you look at the pistons in the bores) and similarly 1,3,7,5 for the odd bank