Jeep Wrangler Forum banner
  • Hey everyone! Enter your ride HERE to be a part of JUNE's Ride of the Month Challenge!

1 - 11 of 11 Posts

·
Registered
Joined
·
15,655 Posts
The choice is very limited as the far ends the middle two and 2 and 5 have to rise and fall together for balance so only a few possible combinations

All start with one by convention

Thus has to be 1-a-x- 6-b -y
Where a-b and y-z have to contain the pairs 2-5 and 3-4

So
1-2-3-6-5-4 or 1-5-3-6-2-4 or
1-2-4-6-5-3 or 1-5-4-6-2-3 or
1-3-2-6-4-5 or 1-4-2-6-3-5 or
1-3-5-6-4-2 or 1-4-5-6-3-2
are the only possible choices for a ballanced even firing straight six




Sent from my SM-S902L using Tapatalk
 

·
Registered
Joined
·
15,655 Posts
Then since you try to distribute the power along the crank

After one you must pick 2 3 4 or 5
And 5 is furthest away

So with 1 then 5 your only choices are
1-5-3-6-2-4 or 1-5-4-6-2-3
The first choice wins as no adjacent pairs fire in sequence while the latter has both 5-4 and 2-3

So pretty much everyone opts for
1-5-3-6-2-4
Even the often fickle government motors


Sent from my iPod touch using Tapatalk
 

·
Registered
Joined
·
507 Posts
Used to have a placard on my shop wall that had two firing orders on it, Ford 302 (old style) and the 351.
Those two firing orders will cover nearly all the older domestic V8s if you numbered the cylinders the same way as ford.
Noticed it when I was drawing out charts of different firing orders and realized that there were actually only two layouts.
 

·
Registered
Joined
·
15,655 Posts
Ford is kinda squirley on the 351 since all that was needed for the two firing orderers was a cam swap
As I recall the the 351W (Windsor) as did the 351M used same firing order as all the other ford V8 including FE and 429/460 but 351C (Cleveland) used the alternate order

However the boss 302 used in 1969 boss 302 mustang also used the 351C firing order unlike all the other 302/5.0


Sent from my SM-S902L using Tapatalk
 

·
Registered
Joined
·
3,841 Posts
All the inline 6cyl. I have ever worked on, all use the 1-5-3-6-2-4, back in the day if you changed the cam out for a Hi-Po type on a 351W you had to use one that was for a 260/289/302 firing order. Later on {90's} the 5.0 {302cid} changed to the firing order of the 351W.
 

·
Registered
Joined
·
54 Posts
Discussion Starter · #9 ·
Ok well just for fun how do you time a Continental R-670 with 1 Bendix magneto and one Delco distributor and which one uses the impulse coupling and which set of plugs does each fire
 

·
Registered
Joined
·
3,841 Posts
Ok well just for fun how do you time a Continental R-670 with 1 Bendix magneto and one Delco distributor and which one uses the impulse coupling and which set of plugs does each fire
I've never worked on one, but maybe that is your job, I did say all I have ever worked on, but that was not my job, but my job was a Machinist, and with a blueprint I can make you a Camshaft for it, LOL! But if I had to work on one I'd get a service manual and learn How. :jawdrop: Just For Fun.
 

·
Super Moderator
Joined
·
12,670 Posts
BTW, look on the intake manifold. The firing order is cast right in, on the top.

Good Luck, L.M.
 
1 - 11 of 11 Posts
Top