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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#40031 08/12/2002 6:38 PM | Joined: Jan 2000 Posts: 125 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 125 | I'm ordering parts for my 261 engine build and hear two different points of view on piston rings. Patrick's say cast rings are fine. One engine shop say's cast rings seat better. Another school of thought is that cast rings are junk and wear out in 50K. I'm baffled.
Grant
1950 Chevy 3100
1952 GMC 150 (In Pieces)
1968 Chevy K20
1966 Shovelhead
1978 BMW 100S
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#40032 08/12/2002 7:23 PM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Cast rings have worked great for years.Moly rings will take longer to seat in and may last longer,but how often do you drive the vehicle?
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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#40033 08/12/2002 9:07 PM | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | I read a great article on rings in an engine building mag. I'll read it again and quote here.
BTW, I ordered a set of Patrick's rings for my 235. The top ring is coated (moly?) and the 2nd ring is cast iron. Don't file a moly ring.
The chrome rings are the "racing" rings that are bad for a street application. They have less cylinder tension for less friction at high RPMs for racing. Their oil control is poor, so thats why you see some good-running street hotrods leaving a smoke cloud. Wrong piston ring application.
There is a separate issue with running hyperuetic pistons. The gap on the #1 compression ring has to be set larger than stock with a hyper piston. But you're prolly running cast street slugs, right?
Chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
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#40034 08/12/2002 10:02 PM | Joined: May 2002 Posts: 20 Member | | Member Joined: May 2002 Posts: 20 | Check this out Piston rings
Porky Pig is just a ham.
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#40035 08/13/2002 12:00 PM | Joined: Jan 2000 Posts: 125 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 125 | Thanks for the tips. Yes I'm using cast pistons. I drive the truck about 15K a year so I want rings that will last. I bought the chrome set. I think the top ring is coated with chromium (sp???)
Grant
1950 Chevy 3100
1952 GMC 150 (In Pieces)
1968 Chevy K20
1966 Shovelhead
1978 BMW 100S
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#40036 08/14/2002 2:16 AM | Joined: Apr 2000 Posts: 71 Shop Shark | | Shop Shark Joined: Apr 2000 Posts: 71 | If you already purchased the chrome rings, they will work ok. The cast rings seat better and don't take any miles to seat. The story I always heard years ago was, if you wanted to keep the rings from wearing, use the chrome ones. If you wanted the block to keep from wearing, use the cast ones. I use cast rings in racing motors and they never smoke from the first time the engine is fired up. My opinion is, if you are above 100,000 miles after the rebuild, ring type might matter, but then look at the factory engines that run over 200,000 miles without a rebuild. Guess it is the same decision type as, what color should I paint my truck. | | |
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