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  #1 (permalink)  
Old 12-28-2007, 07:12 AM
72NOVA454
 
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Piston Ring Questions - Help

Don't hate me for asking this but I will do so anyways.

1) Can piston rings be reused? I have a situation with only 2000 miles on the rings. Got the motor apart now. The cylinder walls look good. I am planning on honing the cylinder walls. Pistons are already out. Rings look good. Can I reuse them? Yes, No, Maybe?

2) What should the ring gap be? When I put a piston ring in the cylinder and measure the "gap" between the two ends of the ring I get about .022". Is that right? What is the "range" of end gap clearance?

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Old 12-28-2007, 07:28 AM
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Piston Ring Questions - Help

if there chrome molly , NO
.004 PER INCH OF CYLINDER ON THE GAP MEASURE
steel rings will re-seat
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Old 12-28-2007, 07:34 AM
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Quote:
Originally Posted by burnt olds
if there chrome molly , NO
.004 PER INCH OF CYLINDER ON THE GAP MEASURE
steel rings will re-seat

How can if tell if they are Chrome Molly or not?

Also, when you say .004" per inch of cylinder wall, do you mean "bore" or "circumference"?

The bore is 4.25". So that would be 4.25" X .004" = .017" of ring gap

or

The circumference is 14". so that would be 14" X .004" = .056" of ring gap

which is it?
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Old 12-28-2007, 09:16 AM
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Piston Ring Questions - Help

.018 - .025 is the less and most for the gap for regular use in your bore size
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Old 12-28-2007, 01:01 PM
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If the engine is apart, BUY RINGS!!! You gonna risk a catastrophic failure over a few bux for rings?? BAD idea.
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Old 12-28-2007, 04:12 PM
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Lee, You would'nt take a bath and put dirty underwear back on would you? If you hone the cylinders, use new rings. You should be able to do an E-Bay rings-bearings-gaskets purchase for $100-$125. There's really no reason you NEED to have it honed with torque plates, or the line bore checked, or decked; just be sure everything goes together right and functions smoothly.It looks like someone already spent a good chunk of change on your motor, but somewhere, something, somehow went wrong; it happens.
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Old 12-28-2007, 04:21 PM
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Quote:
Originally Posted by junior stocker
Lee, You would'nt take a bath and put dirty underwear back on would you? If you hone the cylinders, use new rings. You should be able to do an E-Bay rings-bearings-gaskets purchase for $100-$125. There's really no reason you NEED to have it honed with torque plates, or the line bore checked, or decked; just be sure everything goes together right and functions smoothly.It looks like someone already spent a good chunk of change on your motor, but somewhere, something, somehow went wrong; it happens.
dear Junior

yes - I've taken a bath and put on dirty underwear (this morning). But I'll save that story for later.......

What went wrong is 2-fold. I had a intake manifold coolant leak, and, I had a oil pump pickup tube/screen that fell off inside the pan while the motor was running - and consequently had little or no oil pressure at times. that is what likely caused the cam/lifter damage.

I don't know what kind of piston rings to get. I talked to a guy at Total Seal who told me to definitely use their "gapless" piston rings which are like $200 per set - very expensive. He said I can buy cheap cast iron rings for about $50/set but will be sorry. Bearings will be another $100 for a full set, and gaskets another $100 for a full set.

This sucks.
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Old 12-28-2007, 06:13 PM
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Quote:
Originally Posted by leejoy
dear Junior

yes - I've taken a bath and put on dirty underwear (this morning). But I'll save that story for later.......
Much later I hope!!! LOL


Mark
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Old 12-28-2007, 06:19 PM
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You don't need gapless! What was on the pistons? Did a quick look on E-Bay and name brand Federal Mogul Moly Rings-$49.99/FelPro Gasket Set $41.99/Mahle Main and Rod bearings $29.99-all BIN prices; there are cheaper, but $121.97 TOTAL for rings/bearings/gaskets-how can you pass that up? You do all your cleaning and prep work while you wait for the parts to arrive. I know the machinists on the board here hate E-Bay for the prices they can't begin to even come close to.
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Old 12-29-2007, 07:18 AM
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Gapless rings are not used by many race engine builders most recomend against them, they are a good sales ploy.Standard rings are virtually gapless at operating temp any way.To be quite honest on rerings I have had great luck with plain old cast iron rings.
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Old 12-29-2007, 09:54 AM
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How can I tell what type of piston rings I have now?

Is there a way to tell by looking at them if they are cast iron, ductile iron, or moly?

they have about 2000 miles on them.
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Old 12-29-2007, 10:57 AM
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Quote:
Originally Posted by burnt olds
if there chrome molly , NO
.004 PER INCH OF CYLINDER ON THE GAP MEASURE
steel rings will re-seat
What is a chrom moly ring as there are chrome rings, Moly rings, and cast rings but never heard of chrom moly and I have been building engines for 27 years now and never seen these??

Could you give me the P/N of Chrome moly rings and the supplier??
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Old 12-29-2007, 05:40 PM
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piston ring questions - help

if they are moly rings, rering it with moly rings and gap them and throw them on they break in better with a smoother bore finish and bump your horespower a bit.
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Old 12-29-2007, 07:16 PM
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I believe his "chrome molly" was supposed to read chrome top 2nd molly.
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Old 12-29-2007, 11:05 PM
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Quote:
Originally Posted by carsavvycook
I believe his "chrome molly" was supposed to read chrome top 2nd molly.
Do thay even make a Moly second ring as we have only seen cast rings for the second ring.
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