Ring gap

coolwater28 · Sep 4, 2017

Can anyone tell me the stock ring gap for coyote engines? Has anyone taken the time to file a set of rings using performance methods to see if it will help with longevity? I'm thinking about doing it for a stock longblock nitrous car. Here is the formula I was always taught

stangn · Sep 20, 2017

There are other factors to take into account with ring end gaps. A cast iron block vs alum the alum with cast iron sleeve or plasma wire arc liner. They all require different gaps depending on thermal expansion. One size does not fit all.

coolwater28 · Sep 20, 2017

I understand that, but that's not what I'm asking. A coyote has thin pressed in iron liners and whatever material the stock pistons are Ford only had about .003 per inch of bore diameter, that's pretty tight. What I'm asking is has anyone opened up the ring gaps for safety longevity and see has it helped.

debit_free_2010 · Sep 20, 2017

The top ring gap for the Coyote is spec'd for .006-.010" , Funny thing is Ford used the same ring gaps on the "Aluminator". Seems too tight for running a power adder.

I don't think I've ever seen anyone claim rings butting together caused an engine failure but conventional wisdom is to open the gap when doing a power adder to prevent the ends from butting together.

coolwater28 · Sep 21, 2017

debit_free_2010 said:
The top ring gap for the Coyote is spec'd for .006-.010" , Funny thing is Ford used the same ring gaps on the "Aluminator". Seems too tight for running a power adder.

I don't think I've ever seen anyone claim rings butting together caused an engine failure but conventional wisdom is to open the gap when doing a power adder to prevent the ends from butting together.

Thanks that what I was asking, I always been taught to open the gap for power adders also but I guess "if it ain't broke."

Brutal Metal · Sep 22, 2017

debit_free_2010 said:
The top ring gap for the Coyote is spec'd for .006-.010" , Funny thing is Ford used the same ring gaps on the "Aluminator". Seems too tight for running a power adder.

That's tighter than what the shop does for power adder motors,
.006 ouch...

Ring gap

coolwater28

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stangn

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coolwater28

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debit_free_2010

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coolwater28

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Brutal Metal

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