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Old 09-10-2009, 05:38 PM   #1 (permalink)
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Cleveland or Windsor firing order?

I am not sure whether to run Cleveland or Windsor firing order in my 331 Boss stroker. Does anyone know the reasons why they are different and if one is preferable over the other in terms of reducing harmonic resonance in the crank?
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Old 09-10-2009, 06:56 PM   #2 (permalink)
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Re: Cleveland or Windsor firing order?

You better make up your mind before purchasing a camshaft.

Ford went to the 13726548 just as you said, to reduce stress on the crankshaft.

Someone else can chime in on the engineering statments by ford why they changed the firing order.

I would go with the new firing order even on an older rebuild.

If ford determined it benificial to change the firing order i would go with there desision.
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Old 09-10-2009, 08:33 PM   #3 (permalink)
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Re: Cleveland or Windsor firing order?

Here's some food for thought. See the attached image.
Not only did Ford have two firing orders (15426378 & 13726548), but so did GM (18436572 & 18726543).
Note that Fords 15426378 and GMs 18436572 are identical. They just label the cylinders differently and reference #1 in a different location. Same goes for Fords 13726548 and GMs 18726543.
Also, notice that the pattern of Fords 15426378 and 13726548 identical, except it's flipped about the transverse centerline of the engine.
I conclude that it does not matter. There are a lot more engine design parameters to be picky about.
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Old 09-10-2009, 10:02 PM   #4 (permalink)
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Re: Cleveland or Windsor firing order?

Quote:
Originally Posted by Fairlane427 View Post
Here's some food for thought. See the attached image.
Not only did Ford have two firing orders (15426378 & 13726548), but so did GM (18436572 & 18726543).
Note that Fords 15426378 and GMs 18436572 are identical. They just label the cylinders differently and reference #1 in a different location. Same goes for Fords 13726548 and GMs 18726543.
Also, notice that the pattern of Fords 15426378 and 13726548 identical, except it's flipped about the transverse centerline of the engine.
I conclude that it does not matter. There are a lot more engine design parameters to be picky about.
Try 3 , Ford had 3 firing orders for production V8's . 3rd 15486372
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Old 09-11-2009, 06:03 AM   #5 (permalink)
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Re: Cleveland or Windsor firing order?

The story I heard a long time ago was that when ford developed the 351W and used the old 221/260/289/302 firing order the the 351's #1 main bearing didn't like it, cylinders 1 & 5 and then shortly after 2 & 6 firing one right after another. so they changed the firing order. The original 5.0 HO motors used a 351W marine performance cam so they got the same firing order as a 351W. I would run the newer order, wider selection of cam grinds.
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Old 09-13-2009, 02:29 AM   #6 (permalink)
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Re: Cleveland or Windsor firing order?

Thanks guys – I appreciate the input
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Old 09-25-2009, 11:50 PM   #7 (permalink)
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Re: Cleveland or Windsor firing order?

the windsor firing order gives an additional 5 to 8 horsepower. comp cams makes custom grinds for chevy with the 3/7 5/4 firing order switch. less stress on the crank and instant hp gain just by using 13726548
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