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Old 09-27-2002, 08:52 AM
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Question piston rings

I was wondering what opinions were out there about different types of piston rings, cast rings, moly rings, or chrome rings. What determines which type of rings should be used in an engine? Should the block be honed differently for each type of ring? Are the break in procedures the same or different?

Just trying to expand my knowledge.

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Old 09-27-2002, 09:36 AM
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Cast iron rings are for the most part, good to be used with a budget rebuild, they offer quick seating, and low cost, they are a little more forgiving if you just deglaze the block yourself. I used to use a 280 grit stone, sunnen 560, with cast iron rings.
Now, if you are talking modern piston rings, and finishes, the hot set up now is a plateau finish, which simulates an already broken in surface, it takes most of the sharp edges off of the honed suface, and removes alot of the debris left imbedded in the cylinder wall after honing.
I recommend a 400 grit finish on cylinder walls, followed by a plateau stone for chrome or moly rings.
Chrome rings offer high durability, and are often used in extreme conditions like off-road racing where you encounter alot of dust and dirt.
The modern moly ring is the most popular type of ring used in most performance applications, it offers improved sealing and durability.
There are alot of different types of rings used today, including gapless rings, so I would contact a ring manufacturer, and get professional advice as to what type of surface finish to use with the type of rings your using.
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Old 09-27-2002, 09:45 AM
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Best ring combination for performance engines is: Ductile iron, plasma moly top ring; cast iron, reverse bevel (twist), tapered second ring and three piece oil ring assembly. These ring combinations are available from Perfect Circle, Federal-Mogul, Total Seal, Childs & Albert, JE Pistons and many others. Cylinder preparation is basically the same for all rings, although the cylinder wall should be slightly smoother for moly, than for the chrome rings. Most important thing is for the cylinders to be ROUND. Insist that your block is honed with torque plates. Best ring widths for street/strip applications is still 1/16" compression rings and 3/16" oil ring. Race engines are a different animal and will need different ring combinbations.
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Old 09-27-2002, 11:06 AM
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i am much happier with my cast rings or whatever budget trw rings my machine shop gave me than i was with the chrome moly ones i used last time. make sure you check ring gap. for hi-perf i think the gapless would be best. make sure you bevel the tops of your bores slightley so you dont break any like my poor neighbor didwhen you put them in . he has to take the motor apart now. blah
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