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What alloy are my Arias pistons? #2874195
01/14/21 11:39 AM
01/14/21 11:39 AM
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Northeast Indiana
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73DAD Offline OP
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I bought a set of pistons second-hand but they came with no information sheet. I would like to know if they are 2618 or 4032 alloy so I can set the proper piston to wall clearance.

They are +.060" 426 Hemi pistons. Under the dome they are marked with the arias 'A' and the 'Speedmaster' logo. There are no other marks or coatings.

Skirts measured at 4.308"
Compression height measured about 1.765"
Dome Height is about .515"
Total Height from pin centerline to top is 2.28"
Dome volume is about 85cc
Pin diameter is 1.094" retained by spiral locks
Rings are 1/16, 1/16, 3/16

The skirts have a couple oil grooves going around them.
The wrist pin holes have 2 oiling holes per side. (4 per piston)

They may have been sold new to FHO in Canada in the early nineties. Know its a long shot, but any help would be much appreciated. I already E-mailed Arias so far, but haven't tried FHO yet.

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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Bend,OR USA
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Cab_Burge Offline
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If they are intended for racing they will NOT be the street alloy twocents
If they have a job number or part number on them call Tim at FHO 905-797-2459 and ask him about them scope

Last edited by Cab_Burge; 01/14/21 04:24 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What alloy are my Arias pistons? [Re: 73DAD] #2874434
01/14/21 07:32 PM
01/14/21 07:32 PM
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Oregon
A
AndyF Offline
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Oregon
Good luck with that. The very first stroker motor I ever did was done with some Ross pistons that Muscle Motors sold me. The pistons they sold me were blower pistons but they didn't tell me that. The shop set them up as if they were normal pistons and I scuffed one of them the first time the engine got warm. That Muscle Motors rotating assembly was only one step up from junk but I was too dumb to realize it at the time.

Re: What alloy are my Arias pistons? [Re: AndyF] #2874450
01/14/21 07:57 PM
01/14/21 07:57 PM
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So. Burlington, Vt.
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fast68plymouth Offline
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I’m gonna go with........ “aluminum alloy” smoke


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: What alloy are my Arias pistons? [Re: fast68plymouth] #2874538
01/14/21 11:25 PM
01/14/21 11:25 PM
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Bend,OR USA
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Originally Posted by fast68plymouth
I’m gonna go with........ “aluminum alloy” smoke
you be correct thumbsgrin


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What alloy are my Arias pistons? [Re: Cab_Burge] #2874653
01/15/21 11:03 AM
01/15/21 11:03 AM
Joined: Jan 2003
Posts: 10,666
North Dakota
6PakBee Offline
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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".
Re: What alloy are my Arias pistons? [Re: 6PakBee] #2874667
01/15/21 11:36 AM
01/15/21 11:36 AM
Joined: Jun 2015
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Northeast Indiana
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73DAD Offline OP
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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.

Originally Posted by 6PakBee
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...

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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Missouri
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jwb123 Offline
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Missouri
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.

Re: What alloy are my Arias pistons? [Re: 73DAD] #2874767
01/15/21 03:13 PM
01/15/21 03:13 PM
Joined: Jan 2003
Posts: 10,666
North Dakota
6PakBee Offline
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Originally Posted by 73DAD
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.

Originally Posted by 6PakBee
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 Technology
Columbus, IN 47201
Daleville, IN 47334
Fort Wayne, IN 46803
South Bend, IN 46628
Warsaw, IN 46580

Team Industrial Services
Crown Point, IN 46307

Fort Wayne Metals
Fort Wayne, IN 46809


Hmm. whistling


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: What alloy are my Arias pistons? [Re: 73DAD] #2874800
01/15/21 04:49 PM
01/15/21 04:49 PM
Joined: Jun 2015
Posts: 310
Northeast Indiana
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73DAD Offline OP
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Got what I needed, .007"

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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Posts: 25,618
Rio Linda, CA
John_Kunkel Offline
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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
Re: What alloy are my Arias pistons? [Re: John_Kunkel] #2874848
01/15/21 06:30 PM
01/15/21 06:30 PM
Joined: Jan 2003
Posts: 10,666
North Dakota
6PakBee Offline
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Originally Posted by John_Kunkel
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".
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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Originally Posted by John_Kunkel
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 luck
I haven't talk to her or seen her in a long while shruggy
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)
Re: What alloy are my Arias pistons? [Re: 6PakBee] #2875049
01/16/21 11:56 AM
01/16/21 11:56 AM
Joined: Sep 2003
Posts: 19,237
north of coder
moparx Offline
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moparx  Offline
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Originally Posted by 6PakBee
Originally Posted by John_Kunkel
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.
beer

Re: What alloy are my Arias pistons? [Re: moparx] #2875052
01/16/21 12:07 PM
01/16/21 12:07 PM
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Michigan
A
A727Tflite Offline
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A

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Michigan
Almost cast in stone.....

A5B2FAF6-0D8F-4986-B629-ECC3A61272EB.jpeg
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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Super Spudsville
Mr PotatoHead Offline
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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!
Re: What alloy are my Arias pistons? [Re: Mr PotatoHead] #2875086
01/16/21 01:29 PM
01/16/21 01:29 PM
Joined: Mar 2011
Posts: 3,055
Michigan
A
A727Tflite Offline
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A727Tflite  Offline
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A

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Michigan
How many guys pronounce Edelbrock as “eldebrock”?

Must be something with some guys tongues. shruggy

Re: What alloy are my Arias pistons? [Re: A727Tflite] #2876121
01/18/21 03:01 PM
01/18/21 03:01 PM
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Posts: 19,237
north of coder
moparx Offline
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kind of like "al YOU min E yum"............ biggrin
beer







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