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Old 12-03-2016, 02:09 AM   #1
willynfo
 
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Default piston ring materials

My brother has been trying to find a supplier of Meehanite cast iron for piston rings. he lives in niagara falls, ontario. all the cast iron he has used so far scores the cylinders and gives off a black oil. the engines smokes because the rings don't seat well. can anyone tell me where it can be purchased. the pistons are 1.25 to 1.5 in diameter. thanks for nay help. and no window weighs don't work well lol


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Old 12-03-2016, 03:45 AM   #2
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You can try contacting the authorised foundry in Quebec? http://meehanitemetal.com/our-foundries/

Gerrit


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Old 12-03-2016, 07:18 AM   #3
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Surely there is more than one source of centrifugally cast Meehanite.

My source was/is a rusty marking out table which cost me all of £3.
However, failing a supply there should be things like brake drums or perhaps an engine block.
I agree that many sash weights leave a lot to be desired

Norman
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Old 12-03-2016, 08:23 AM   #4
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You will find cast iron in old cam shaft (between the cams since the cams is hard to work with tool) or old brake disc. I has used the cast iron from brake disc as piston ring, last very well.
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Old 12-03-2016, 10:01 AM   #5
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Try Terra Nova in Mississauga. All our club members do.
Meehanite is a brand name but they'll know what your talking about if you quote the name. I've used their continuous cast (grey cast) or whatever they choose to call it for all my rings and have had no problems.

http://www.terranovasteel.ca/Lang_ENG/

They don't normally deal with hobbyists and they appreciate you ordering it ahead so they don't have to scramble when you just walk in, but they will deal with you. I've always just bought whatever chunk they had laying in their cutoffs so as not to be a bother. It's cheap enough.

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Old 12-03-2016, 03:23 PM   #6
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I got the very small amount of ductile cast iron I needed from McMaster-Carr. While I'm just starting to make rings, the machining process seems to go very well. The usual recommendation is Meehanite, but so far ductle iron seems fine.

Lohring Miller
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Old 12-04-2016, 12:33 AM   #7
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Like I said Meehanite is a trade name and might just be their term for ductile cast iron. I don't know the specs for "Meehanite". (or any other cast iron for that matter).
Whatever I used from Terra Nova has worked fine for several engines. from .875 dia to 2-1/4 dia.
I don't think you can go too far wrong. Folks also use plain steel and bronze for rings. That's about as far as you can get from cast iron.
I'm glad you're finding it easy to machine.

BTW what method are you using to make your rings? (i.e "the Trimble method" or other)? As they say "The devil is in the details".

http://davesage.ca/

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Old 12-04-2016, 01:52 AM   #8
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From the Meehanite website:
"Meehanite® metal is a family of different types of superior engineered cast irons, including nodular iron, flake graphite and white cast irons. The key to the undisputed success of Meehanite® metals is the rigid application of its patented manufacturing process."

Nodular is also known as Ductile and/or Spheroidal Graphite (3D iron in Australia)
Flake is also known as Grey or Gray iron, Continuously cast iron, Pearlitic Iron etc (4E in Australia)

Nodular/Ductile/SG/3D for compression rings
Flake/Grey for cylinders and oil rings
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Old 12-04-2016, 07:44 AM   #9
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Quote:
Originally Posted by lohring View Post
I got the very small amount of ductile cast iron I needed from McMaster-Carr. Lohring Miller
Good suggestion Lohring, but McMaster stopped shipping to common mortals in Canada many years ago. They only serve bigger companies & educational clients.

Speedy metals sells Class 40 grey which I think some builders have successfully used. Be aware they only ship UPS so you will incur the dinger fees into Canada.
http://www.speedymetals.com/c-8388-category.aspx

There are CDN Durabar dealers but I have yet to find one that will sell something less than the proverbial 10 foot pole.

Ive seen the odd ebay droppings but not often. If you discover any 'hobbysist volume' dealers, please post contact info, I'm interested too. (Those salvage suggestions were good, never thought of that).
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Old 12-04-2016, 09:32 PM   #10
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There is http://hobbymetalskits.com in US. They have Class 40 ci. For willynfo's brother that would work if he gets a US post box, eg. at http://cbiusa.com

There is also http://www.alro.com/divmetalsplus/ in Tonawanda, NY which has a retail location for cut-to-size.


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