Firing order math.....

[dmaddox]

Ok, now that I have spark (thanks guys), I need some help with firing order. I have looked at this too long and now my brain feels like spaghetti.

Firing order is: 1-5-3-6-2-4

Now, as mentioned the newer distributors are phased 90 degrees differently than old ones are. So.....

With #1 TDC (compression stroke), my rotor is 90degrees to the left of what it used to be.

It is now pointing at just about the #2 position on the distributor cap. (giving myself room to advance as needed w/o the vacuum assembly hitting the dipstick).

So, if my #1 TDC compression is pointing at the #2 position on my distributor cap, easy enough - MAKES GOOD NOTES and plug my #1 cylinder wire into the #2 position on my distributor cap.

But then, where do the others go.....sounds simple, but I am tired and feeling stupid this morning.

Can you guys help?

ENGINE------------------CAP
=================
1..................................2


...thanks (sigh of shameful stupidity)

 

[Dieseler]

Once you establish #1 it will be the same order 153624

 

[malcb]

If I understand it right;

1-5-3-6-2-4
becomes?
2-4-1-5-3-6

Didn't know the dizzy changed????

O and watch out for rags......... sorry

 

[Degnol]

15-too young 36-too old 24-just right

 

[e rock]

I missed the original thread, but is there a simple explanation why you're not just pulling the distributor body out and rotating the shaft/rotor so that it points to the #1 spot on the cap?

 

[dmaddox]

e rock - you can't.

See on the old dizzy's the "end" of the shaft that goes into the engine, and the rotor placement are 90 degrees of each other.

On new dizzy's the rotor and end are in the same direction as each other. So...you can't just lift it out and turn it. If I turned it 180 degrees, it would line up again, but the dizzy would be backwards.

This was just hard because of so many numbers but yes, as malcb pointed out:

1-5-3-6-2-4
becomes?
2-4-1-5-3-6

So, 1 plugs into 2, 5 into 4, 3 into 1, etc..

 

[e rock]

e rock - you can't.

See on the old dizzy's the "end" of the shaft that goes into the engine, and the rotor placement are 90 degrees of each other.

On new dizzy's the rotor and end are in the same direction as each other. So...you can't just lift it out and turn it. If I turned it 180 degrees, it would line up again, but the dizzy would be backwards.

This was just hard because of so many numbers but yes, as malcb pointed out:

1-5-3-6-2-4
becomes?
2-4-1-5-3-6

So, 1 plugs into 2, 5 into 4, 3 into 1, etc..

Yes, technically, shifting the wires around the circle will get you running, but why not just turn the dizzy shaft 90 degrees, and then you won't have to bookmark this thread for the next time you change your distributor cap.

Just use a long screwdriver to turn the oil pump slot 90 degrees so the shaft will slip into it when you re-insert it oriented the correct direction. You're not limited to 180* intervals.

 

[inkpot]

Howdy! Can't you just reach in with a long screwdriver and rotate the oil pump drive slot by 90 degrees, and then proceed with normal wiring positions? John

 

[e rock]

Howdy! Can't you just reach in with a long screwdriver and rotate the oil pump drive slot by 90 degrees, and then proceed with normal wiring positions? John

 

[inkpot]

Like, a yea,,,,, a,,, why didn't I think of that!?!?!?! We both logged that one at 10:45, that's funny. Haven't done that in a while. John

 

[Mr. Toad]

This is funny.

 

[vk7ybi]

Howdy! Can't you just reach in with a long screwdriver and rotate the oil pump drive slot by 90 degrees, and then proceed with normal wiring positions? John

Cant you just align the distributor shaft gear and cam gears properly, push down on the distribotor while cranking the engine to engage the oil pump, and then proceed with normal wiring positions?

 

[dmaddox]

Don't know. And didn't want to screw it up - so I just changed the order and it's running now

 

[joeyg1973]

Jesus Christ you went around your elbow to scratch your a******.

 

[dmaddox]

Sorry. I just didn't know. And as fidgety as the system "can" be.....I wanted to be cautious.

Heck if it's as easy as simply moving the motor around once it's set in the gears to get it to fall into that slot down there - I can always go back and fix it so the number on the cap match.

But to put it in your words, I finally scratched it.

Cheers - Dallas

 

[Poser]

Jesus Christ you went around your elbow to scratch your a******.

Oh the irony of that statement....

 

[cyrilward]

oh the irony of that statement....

great catch

 

[Pin_Head]

See on the old dizzy's the "end" of the shaft that goes into the engine, and the rotor placement are 90 degrees of each other.

..

It doesn't really matter. Stick it in, make sure the oil pump is engaged, time it and run it.