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02-13-2014, 01:39 AM
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CC Member
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Join Date: Oct 2007
Cobra Make, Engine:
Posts: 176
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Firing Order Ford FE390 - need help !
Hi guys,
I have a Cobra with a Ford FE390 engine in my shop. The distributor is marked with numbers and if I believe these numbers ( clockwise ), the firing order is 1 5 4 3 7 2 6 8. Is this correct ?
I thought, that the correct firing-order for these
engines is 1 5 4 2 6 3 7 8....
Thanks,
Stephan
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02-13-2014, 01:58 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
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Per my Ford FE Engine book all firing orders except for the 351s are what you gave above. Try to separate the 7 & 8 wires some as the high energy ignitions can cause an arch between them if one gets a weak place in the insulation.
I thought, that the correct firing-order for these
engines is 1 5 4 2 6 3 7 8....
However they can be wired to fire in a different order if you want to mess with it and I can see no really good reason to do so. The only ones that I ever saw that did that were on the 351s.
Ron
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02-13-2014, 03:52 AM
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Join Date: Dec 2001
Location: Louisville,
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Cobra Make, Engine: I'm Cobra-less!
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15426378, counter clockwise.
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02-13-2014, 06:02 AM
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Join Date: Apr 2009
Location: Little Rock area,
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Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
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Probably has a small block distributor cap on it.
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02-13-2014, 06:28 AM
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Ok, I think I will go with 1 5 4 2 6 3 7 8.....
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02-13-2014, 08:40 AM
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
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Quote:
Originally Posted by Stephan427SC
Ok, I think I will go with 1 5 4 2 6 3 7 8.....
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If you "rotate" the order around the cap a little bit it helps some on the 7 and 8 problem because the wires aren't tracking next to one another as much. You know it doesn't matter where the #1 plug actually is on the cap, provided you have the distributor in properly for it so that the overall timing is right. If you don't know what I'm talking about, then forget this post and just put wires in the location and order as stock from the factory.  |
02-13-2014, 10:25 AM
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Join Date: Mar 2002
Location: Mooresville,
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Cobra Make, Engine: Factory Five chassis/Mr. Bruce slabside
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Don't forget, it's COUNTER clockwise.
John O
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jjo42
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02-13-2014, 02:32 PM
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They use the same cap, big & small block.
John O
Quote:
Originally Posted by DanEC
Probably has a small block distributor cap on it.
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jjo42
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02-14-2014, 04:52 AM
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Join Date: Apr 2009
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Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
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Quote:
Originally Posted by jolsen42
They use the same cap, big & small block.
John O
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That was sort of my point. Since some of the small blocks run a different firing order maybe he found a odd one molded with the 1 5 4 3 7 2 6 8 order on it and marketed as specific for small block applications. A Chinese special possibly.  |
02-14-2014, 12:54 PM
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Firing order
The firing order is determined by the cam not the block (small or large). HO Ford engines (usually 302s) have their own firing order. The cap makes no difference in the firing order, unless it only has seven leads.  |
02-14-2014, 01:39 PM
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That is soo true.  All ford distributors from 57-73 use the same cap with just #1 molded on. Firing order is determined by the cam.
John O
Quote:
Originally Posted by DesertMK4
The firing order is determined by the cam not the block (small or large). HO Ford engines (usually 302s) have their own firing order. The cap makes no difference in the firing order, unless it only has seven leads. |
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jjo42
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02-14-2014, 04:15 PM
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Join Date: Apr 2009
Location: Little Rock area,
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Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
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Quote:
Originally Posted by DesertMK4
The firing order is determined by the cam not the block (small or large). HO Ford engines (usually 302s) have their own firing order. The cap makes no difference in the firing order, unless it only has seven leads. |
Well, it might improperly - if the cap has a SB firing order molded into it (as the OP said his has) and someone not knowing any better tries to wire his FE to match it. I don't see where anyone alleged that the engine's proper firing order is established by the cap.  |
02-14-2014, 04:57 PM
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Quote:
Originally Posted by DanEC
Well, it might improperly - if the cap has a SB firing order molded into it (as the OP said his has) and someone not knowing any better tries to wire his FE to match it. I don't see where anyone alleged that the engine's proper firing order is established by the cap. |
You did.
Quote:
Originally Posted by DanEC
Probably has a small block distributor cap on it.
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There is no small block specific dist.cap. They are all the same. The op never said the firing order was molded into the cap. He said it was marked. I would think most likely with a sharpie. Anyway, I think we've sufficiently covered this.
John O
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jjo42
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02-15-2014, 06:39 AM
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Join Date: Apr 2009
Location: Little Rock area,
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Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
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I took his post to mean it was an odd-ball cap with molded in terminal numbers - I probably misunderstood since he actually said distributor was marked.
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02-15-2014, 06:57 AM
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Quote:
Originally Posted by Stephan427SC
Ok, I think I will go with 1 5 4 2 6 3 7 8.....
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Did it work for you?
if not, three things come to mind:
1: Your distributor is off a tooth or two and/or is not indexed correctly
2: You are not setting up your plugs based on proper #1 location on the distributor cap.
3: You are not wiring them up in the proper engine rotation.
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