piston rings
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Tuned
Joined: Sep 2024
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piston rings
HI everyone
I'm now looking for advice on piston rings. The ones on our FE360 are OEM (so cast iron). We're prepping to put a cross hatch on the cylinder which are amazingly true and round (fantastic news). I understand that typical advice is to replace the rings with the same type (cast) as we're reusing the OEM pistons. We will measure to see if (or how much) we need to go oversize once honing is complete but I just wanted to hear from y'all regarding using cast, OEM style rings.
Thanks for your advice
I'm now looking for advice on piston rings. The ones on our FE360 are OEM (so cast iron). We're prepping to put a cross hatch on the cylinder which are amazingly true and round (fantastic news). I understand that typical advice is to replace the rings with the same type (cast) as we're reusing the OEM pistons. We will measure to see if (or how much) we need to go oversize once honing is complete but I just wanted to hear from y'all regarding using cast, OEM style rings.
Thanks for your advice
Logistics Pro
Joined: Jun 2004
Posts: 4,767
Likes: 3,379
From: South Central Utah
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Tuned
Joined: Sep 2024
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Thanks fellas! Yes, I've been searching the youtube as we do and found a channel called Uncle Tony's Garage. He seems super knowledgable and has tons of experience. His video here
covers a lot of info and it fits with what I have learned elsewhere. The rings that @Rubiranch mentions above are these type... I'm just hoping someone will have done this before me and chime in. Looks like a 220 grit is suitable for cast rings but I'd like to confirm!
I agree too on the checking for roundness Mark A. My son is a machinist and has done this with our 360 (using his gauges) and have confirmed the trueness.
I agree too on the checking for roundness Mark A. My son is a machinist and has done this with our 360 (using his gauges) and have confirmed the trueness.
Cargo Master
Joined: Oct 2020
Posts: 2,676
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Don't use cast rings use moly rings if available.
What you're really trying to do when you glaze break the cylinder is put in the RvK that has been worn away to allow you to use the plateau finish that was created by the old ring yet with valleys to hold the oil. This is why a 220 vitrified or a 320 diamond stone can be used because it isn't really making a big effect on the Rk or the Rpk in the cylinder. Just a few strokes is plenty. You're not going to change the geometry of the cylinder to any real degree with a flex or ball hone.
What you're really trying to do when you glaze break the cylinder is put in the RvK that has been worn away to allow you to use the plateau finish that was created by the old ring yet with valleys to hold the oil. This is why a 220 vitrified or a 320 diamond stone can be used because it isn't really making a big effect on the Rk or the Rpk in the cylinder. Just a few strokes is plenty. You're not going to change the geometry of the cylinder to any real degree with a flex or ball hone.
Hotshot
Joined: Jul 2020
Posts: 10,478
Likes: 2,636
From: Near Salt Lake City
I assume you have not taken the pistons out of your old 360 yet, nor looked at the bores or cut the ring ridge?
I say that because you said you were going to re use the original pistons
Like the above post mentions about measuring the cylinders with a bore taper gauge on one tenth of a thou increment
I think you should plan on a bore job and new pistons
I've cut many a ring ridge out of those old 360 and 390 FE motors
Yours will have a big one by now and you know what that means?
The cylinders will be egg shaped and no ring will seal properly
That is precisely why they make bore taper gauges in the first place
I say that because you said you were going to re use the original pistons
Like the above post mentions about measuring the cylinders with a bore taper gauge on one tenth of a thou increment
I think you should plan on a bore job and new pistons
I've cut many a ring ridge out of those old 360 and 390 FE motors
Yours will have a big one by now and you know what that means?
The cylinders will be egg shaped and no ring will seal properly
That is precisely why they make bore taper gauges in the first place
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Cargo Master
Joined: Oct 2020
Posts: 2,676
Likes: 785
I assume you have not taken the pistons out of your old 360 yet, nor looked at the bores or cut the ring ridge?
I say that because you said you were going to re use the original pistons
Like the above post mentions about measuring the cylinders with a bore taper gauge on one tenth of a thou increment
I think you should plan on a bore job and new pistons
I've cut many a ring ridge out of those old 360 and 390 FE motors
Yours will have a big one by now and you know what that means?
The cylinders will be egg shaped and no ring will seal properly
That is precisely why they make bore taper gauges in the first place
I say that because you said you were going to re use the original pistons
Like the above post mentions about measuring the cylinders with a bore taper gauge on one tenth of a thou increment
I think you should plan on a bore job and new pistons
I've cut many a ring ridge out of those old 360 and 390 FE motors
Yours will have a big one by now and you know what that means?
The cylinders will be egg shaped and no ring will seal properly
That is precisely why they make bore taper gauges in the first place
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