Re: What alloy are my Arias pistons?
[Re: 73DAD]
#2874340
01/14/21 04:23 PM
01/14/21 04:23 PM
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Joined: Aug 2003
Posts: 43,129 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,129
Bend,OR USA
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If they are intended for racing they will NOT be the street alloy If they have a job number or part number on them call Tim at FHO 905-797-2459 and ask him about them
Last edited by Cab_Burge; 01/14/21 04:24 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What alloy are my Arias pistons?
[Re: Cab_Burge]
#2874653
01/15/21 11:03 AM
01/15/21 11:03 AM
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Joined: Jan 2003
Posts: 10,707 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,707
North Dakota
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Do you have anyone in your area that could do a metallurgical analysis for you? I see the aluminum percentage varies quite a bit between the two alloys (85% vs. 94%) with most of the difference being made up with silicon. This should be a cakewalk for a lab.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: What alloy are my Arias pistons?
[Re: 6PakBee]
#2874667
01/15/21 11:36 AM
01/15/21 11:36 AM
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Joined: Jun 2015
Posts: 313 Northeast Indiana
73DAD
OP
enthusiast
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OP
enthusiast
Joined: Jun 2015
Posts: 313
Northeast Indiana
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I reckon I'll just run them loose and let them slap, the block is junk so nothing to lose anyway. I'm thinking maybe like .006"-.008" piston to wall. Do you have anyone in your area that could do a metallurgical analysis for you? I see the aluminum percentage varies quite a bit between the two alloys (85% vs. 94%) with most of the difference being made up with silicon. This should be a cakewalk for a lab. Why didn't I think of that? Lemme just pop on down to the corner metallurgical analysis lab. I hear they're running a 'buy one spectrum analysis, get one rockwell hardness test free' deal...
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Re: What alloy are my Arias pistons?
[Re: 73DAD]
#2874678
01/15/21 12:08 PM
01/15/21 12:08 PM
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Joined: Nov 2015
Posts: 875 Missouri
jwb123
super stock
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super stock
Joined: Nov 2015
Posts: 875
Missouri
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Unless they are something special your Arias pistons should be a 2618 alloy, which is what the vast majority of racing pistons use. One post mentioned scuffing with the 2618 alloy, and my experience is that since the 2618 alloy is also very hard, even with proper clearance, scuffing can be a problem, I know it has been on my engines over the years. Most of my engines go 4 years or so, and I like ross pistons, many times they will show scuffing on the cylinders. And it is the alloy, not the pistons.
The 4031 alloy forged pistons, with a 12% silicone content are getting popular, I would not hesitate to run them on say a bracket type engine, and also from my experience they do help a lot with cylinder wall scuffing. The expand about 15% less than the 2618 alloy, so you need less clearance, that helps keep the rings sealed up better as well.
The 4031 alloy is not the same as the Hypereutectic high silicone cast pistons which I think have around 20% silicone content. Several years ago they started using hypereutectic pistons in OEM engines, and I am seeing lots of stock replacement cast pistons for older engines coming as hypereutectic castings. I don't mind the change in material, except they have stopped putting in the warnings for clearance and ring end gap changes needed for hypereutectic VS regular cast pistons. So you got to be careful to figure out what you have.
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Re: What alloy are my Arias pistons?
[Re: 73DAD]
#2874767
01/15/21 03:13 PM
01/15/21 03:13 PM
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Joined: Jan 2003
Posts: 10,707 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,707
North Dakota
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I reckon I'll just run them loose and let them slap, the block is junk so nothing to lose anyway. I'm thinking maybe like .006"-.008" piston to wall. Do you have anyone in your area that could do a metallurgical analysis for you? I see the aluminum percentage varies quite a bit between the two alloys (85% vs. 94%) with most of the difference being made up with silicon. This should be a cakewalk for a lab. Why didn't I think of that? Lemme just pop on down to the corner metallurgical analysis lab. I hear they're running a 'buy one spectrum analysis, get one rockwell hardness test free' deal... Hmm. SGS North America Inc.Columbus, IN 47201 Element Materials TechnologyColumbus, IN 47201 Daleville, IN 47334 Fort Wayne, IN 46803 South Bend, IN 46628 Warsaw, IN 46580 Team Industrial ServicesCrown Point, IN 46307 Fort Wayne MetalsFort Wayne, IN 46809 Hmm.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: What alloy are my Arias pistons?
[Re: 73DAD]
#2874812
01/15/21 05:06 PM
01/15/21 05:06 PM
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Joined: Jan 2003
Posts: 25,757 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,757
Rio Linda, CA
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Kinda on topic, how do you pronounce Arias? I've heard it pronounced uh-rye-us and air-ee-eez.
The INTERNET, the MISinformation superhighway
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Re: What alloy are my Arias pistons?
[Re: John_Kunkel]
#2874848
01/15/21 06:30 PM
01/15/21 06:30 PM
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Joined: Jan 2003
Posts: 10,707 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,707
North Dakota
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Kinda on topic, how do you pronounce Arias? I've heard it pronounced uh-rye-us and air-ee-eez. Kind of off topic but how do you pronounce Weiand? Why-and or Whee-and?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: What alloy are my Arias pistons?
[Re: John_Kunkel]
#2874883
01/15/21 07:54 PM
01/15/21 07:54 PM
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Joined: Aug 2003
Posts: 43,129 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,129
Bend,OR USA
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Kinda on topic, how do you pronounce Arias? I've heard it pronounced uh-rye-us and air-ee-eez. Julie Arias, former wife of Nick Arias Jr. pronounced it like Aireus, if I'm remembering correctly now I haven't talk to her or seen her in a long while She use to work for NHRA at a lot of the west coast national and division 7 races.
Last edited by Cab_Burge; 01/16/21 01:16 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What alloy are my Arias pistons?
[Re: 6PakBee]
#2875049
01/16/21 11:56 AM
01/16/21 11:56 AM
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Joined: Sep 2003
Posts: 19,366 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,366
north of coder
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Kinda on topic, how do you pronounce Arias? I've heard it pronounced uh-rye-us and air-ee-eez. Kind of off topic but how do you pronounce Weiand? Why-and or Whee-and? Y-and.
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Re: What alloy are my Arias pistons?
[Re: A727Tflite]
#2875060
01/16/21 12:30 PM
01/16/21 12:30 PM
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Joined: Aug 2019
Posts: 9,434 Super Spudsville
Mr PotatoHead
Half Baked
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Half Baked
Joined: Aug 2019
Posts: 9,434
Super Spudsville
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I used to run three of them on a modified pull tractor, whenever calling for parts or even buying the complete motors which way back it was pronounced just as its reads, maybe the more "professional" drag people had to put a un needed spin on it.
STOP POTATO HATE!
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