Oversized piston rings

[BaySHO Performance]

F3DZ-6108-F and F3DZ-6108-C are 0.020 thou oversized pistons for the 3.2 ATX. Has anyone found rings for them? The manual only has specs for the standard rings.

 

[luigisho]

You try and gather the oem ring specs and contact someone from one from one of the aftermarket suppliers like a Mahle rep?

 

[BaySHO Performance]

Or Hastings....if no-one's done this before, I'll have to carefully measure a piston to come up with a set of specs and go from there. Ford never published them. I've contacted Josh at SHO Nut to see if he knows.

 

[zoomlater]

Josh's old website list the part numbers of the rings, click on the engine link

http://www.shonutperformance.com/Old.htm

3.0 Ring (Ford) E9DZ-6148-A
3.2 Ring (Ford) F3DZ-6148-A


Hastings 3.0 Rings 2C4650
Hastings 3.2 Rings 2C4881

 

[BaySHO Performance]

Hey, thanks for doing the research. Unfortunately, those are for the standard sized pistons, not the 3.2 +0.020 oversized I'm looking for.

I'm going to pop over to my Ford dealer to see if they can shed any light.

 

[BaySHO Performance]

PN for the 3.2 +0.020s F3DZ-6148-C. None in dealer inventory or eBay, Will have to carefully measure one of the pistons to come up with the specs and go from there.

 

[luigisho]

Check back if/when you get an answer. There is a file fit method to make rings fit but I never had it done or seen someone do it. Hopefully one of the major suppliers can get you close and walk you through it or luck out and find a good size from another application or make a set for you

 

[zak]

Nick I would suggest calling Hastings directly, they were very helpful when I called to ask about what tension their oil rings are (they are medium tension, might try them on the low mileage 3.2 I have on hand, stock are low tension). Top ring is 1.2 mm, middle is 1.5.

 

[BaySHO Performance]

What's needed is the following for 20 thou oversized 3.2 pistons:

Cylinder bore 3.642"
Ring widths (height) 1.2, 1.5, 2.8mm, top to bottom.
I've compared both standard and +20 pistons side by side, and I'm pretty certain that the ring land dimensions are identical in terms of width and depth. No reason for them to have changed.

There's only one engine in existence with that bore: the 2007-14 Ford Duratec 3.5L for the Edge, Fusion and Taurus.

Per www.hastingspistonrings.com/ring-finder, the ring set for that motor is 3642XC. The top two rings have the right width, but the oil ring is 2.5mm, not 2.8.
Would the 2.5 mm be too loose? I think so. The side clearance should only be 0.06 - 0.15 mm.

Looking at www.totalseal.com, and then doing a search for 3.642 bore under conventional rings comes back with PN 3642XC that has a 2.8 mm oil ring. However, when clicking on the PN displayed, it comes back as for a 3.622 bore, which won't work.

So I called Total Seal and spoke to a sales rep. They offer an oil ring of exactly the right dimensions: 3.642", 2.8mm. 120 thou deep, the ring land has to be at least 5 thou more than that. The depth on our ring lands is 125 thou, so no problems there. PN 001688, not in their online catalogue.

So it looks like that's the solution. Hastings 3642XC for the compression rings, and Total Seal 001688 for the oil ring. I didn't call Hastings on the oil ring: they may also have one that works.

 

[luigisho]

Someone pin this somewhere for later reference?

 

[SHOdded]

Any coatings on the rings to be concerned with?

 

[BaySHO Performance]

No idea. I've never heard of rings being coated.

 

[rubydist]

What's needed is the following for 20 thou oversized 3.2 pistons:

Cylinder bore 3.642"
Ring widths (height) 1.2, 1.5, 2.8mm, top to bottom.


Per www.hastingspistonrings.com/ring-finder, the ring set for that motor is 3642XC. The top two rings have the right width, but the oil ring is 2.5mm, not 2.8.
Would the 2.5 mm be too loose? I think so. The side clearance should only be 0.06 - 0.15 mm.

2.5mm oil rings will not work in a groove for 2.8mm oil rings - they will be way too loose.

I would use the standard bore oil rings. If you look at how the oil rings fit, using them in a 20 over piston should be just fine.

If the Duratec rings are the right horizontal thickness as well as the right vertical thickness, then there is a good chance they will work fine.

 

[BaySHO Performance]

Correction: the Hastings PN is 2C5164, not 3642XC. I've emailed Hastings to get the horizontal thickness of the top two rings to make sure the ring lands are deep enough, and if they have an oil ring: 3.642", 2.8mm. max 120 thou deep (ring land is 125 thou).

Use oil rings from their 2C4881 ring set for the 3.2L with stock pistons? Let's do the math. Circumference is 2 PI R, or PI D. PI is 3.142.

Stock ring, 3.622" bore, circumference 11.380"
+20 ring, 3.642" bore, circumference 11.443"

So the ring gap would be 11.443-11.380, 63 thou. Specs for the oil ring are 8-20 thou, so it wouldn't work. Plus I don't think that the top and bottom parts of the oil ring would sit right when stretched that far.

 

[rubydist]

my experience is that the oil control ring gap is not very important compared to the compression ring gaps, so I would do that, but if you are not comfortable with that, then I guess you need to keep looking.

 

[BaySHO Performance]

Final solution: Hastings 3.2 Rings 2C4881 (standard size) are listed in their online catalog. However, they also have 2C4881 020, 20 thou oversized rings. Not listed online. They can be purchased direct from Hastings, 1 800 766 1088. Price quoted $219.58 plus shipping.

From what I've gathered from calling one of the wholesalers they gave me, these rings would have to come direct from the factory. Not surprising for anyone else to stock oversized rings. But some hunting may get a better price.

 

[vladimir]

F3DZ-6108-F and F3DZ-6108-C are 0.020 thou oversized pistons for the 3.2 ATX. Has anyone found rings for them? The manual only has specs for the standard rings.