Arias pistons question... - Chevelle Tech
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post #1 of 24 (permalink) Old Nov 30th, 06, 7:41 PM Thread Starter
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Arias pistons question...

The 34 year-old high performance shop near me has sold to new (young) owners and I went by today to go over what they have as they are selling the old inventory. Alot of you guys would be drooling, stacks of dust-covered parts going back 30 years and they have no clue what most of it is.

Among the treasures are 6 sets of new, in the box Arias "Speedmaster" 454 pistons... flat-top and dome. I need a set of slugs for my build and was hoping one of you here with a long memory might have some advice or remember if they're good. They are from the late 80's, forged 2618 aluminum. He's selling them for $300 a set and I wanted to know if I should buy or not.

Thanks a bunch!

Chris

70 Chevelle
454 .030
10.78 @ 122.89....1.48 60'
http://s270.photobucket.com/albums/j...afilter=images
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post #2 of 24 (permalink) Old Nov 30th, 06, 8:15 PM
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Re: Arias pistons question...

My vote is YES! $300 is about half price for a set of those pistons.
I have a set in my 427 and I like them.
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post #3 of 24 (permalink) Old Nov 30th, 06, 9:10 PM
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Mark
 
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Re: Arias pistons question...

Me too, me too! Nice pieces at that price for sure.

1996 SS Camaro. 565 on a 28" x 10.5" tire. All motor.
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post #4 of 24 (permalink) Old Dec 1st, 06, 10:11 AM
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Bill R
 
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Re: Arias pistons question...

Arias is a good quality piston, buy 'em all.

Bill
64 Chevelle Malibu Sport Coupe (original owner) car now has 427" BB, Jerico 5-spd. trans., Dana 60 rear end.

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post #5 of 24 (permalink) Old Dec 1st, 06, 10:40 AM
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TerribleTom II
 
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Re: Arias pistons question...

Older Arias were sort of a low-tech deal that used a lot of clearance, like .007. This will produce much more cold piston noise than people today are accustomed to. Also, you would want to verify suitability as to compression height, ring groove sizes, pin retaining method, etc. I've used a bunch of Arias pistons in oval track racing applications, seemed like there was always some little custom detail that made them like a custom built thing.

Tom
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post #6 of 24 (permalink) Old Dec 1st, 06, 11:28 PM Thread Starter
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Re: Arias pistons question...

Thank you all, esp Mr. Mobley. I'm racking my brain now trying to figure out piston-valve clearance in general. I just ordered a custom cam from Harold so I guess I'll ask him for piston recommendations. If I'll have to fly cut regardless then I'll just get these and have 'em cut.

Mr. Mobley, you mentioned "always some little custom detail" with Arias...could you explain more? I'm relatively new and not sure whether thats good or bad.

Thanks again for the help.

chris

Chris

70 Chevelle
454 .030
10.78 @ 122.89....1.48 60'
http://s270.photobucket.com/albums/j...afilter=images
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post #7 of 24 (permalink) Old Dec 2nd, 06, 4:02 AM
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Eric
 
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Re: Arias pistons question...

2618 material is for N2O ,so I would say yes and they may already have oversized valve reliefs.Most people who run a good hit will use a larger exhaust valve.Also ,ask Howards about them and see if you can get a part number.If they need fly cutting,be cautious.
Do some research first.It would be bad if you bought a $300.00 set of pistons you couldn't use.
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post #8 of 24 (permalink) Old Dec 2nd, 06, 8:54 AM
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Re: Arias pistons question...

I'd try calling Arias with the numbers off the box first.

One box I had, the pin retainer grooves were odd, used a lock I had a hard time finding. Another had different width ring grooves, I ended up having to buy 2 sets of rings, mix and match. Little custom things I didn't know about because I bought them from somebody who had ordered them for something and not used them. Not a deal killer, just not known about in advance.

Tom
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post #9 of 24 (permalink) Old Dec 2nd, 06, 10:19 AM
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Ken
 
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Re: Arias pistons question...

Some of the older "special things" included "press fit rings"!! The rings grooves were super tight, and to install the top rings you had to heat the piston to install the rings. Otherwise, the ring would not fit in the groove. This feature would make pistons so equipped useless as street motor pistons.
Make sure the pistons are not of this type. Get a piston ring that should fit and see if you can slide it in the groove. If they were truely made in the 80's, I believe the "Press Fit" style was out of vogue by then.

Make sure the wrist pin isn't up into the oil groove.

A lot of the older piston skirts had a slick finnish that did hold oil very well. If the pistons are made like that, they will benefit from glass beading the thrust surfaces.

kirkwoodken
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post #10 of 24 (permalink) Old Dec 2nd, 06, 1:30 PM Thread Starter
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Re: Arias pistons question...

Thanks again guys. I learn more every day. FYI, I'm new to piston particulars but I did notice these pistons have horizontal grooves cut into the skirts over the entire surface of the skirt, and they also have what appear to be oil bleed holes at the tops of the skirts just under the rings. Had not seen this before and not sure what they are for. Looked kinda cool to a dummy like me though.

I will try the ring trick to make sure they accept them, thanks.

Chris

70 Chevelle
454 .030
10.78 @ 122.89....1.48 60'
http://s270.photobucket.com/albums/j...afilter=images
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post #11 of 24 (permalink) Old Dec 2nd, 06, 2:37 PM Thread Starter
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Re: Arias pistons question...

Hey guys, I just ran up to the shop and took photos of these pistons so you can see them for yourselves. Would love to read any comments.

http://www.putfile.com/pic.php?img=4150762
http://www.putfile.com/pic.php?img=4150761
http://www.putfile.com/pic.php?img=4150760
http://www.putfile.com/pic.php?img=4150759
http://www.putfile.com/pic.php?img=4150758

Chris

70 Chevelle
454 .030
10.78 @ 122.89....1.48 60'
http://s270.photobucket.com/albums/j...afilter=images
moonbeam1999 is offline  
post #12 of 24 (permalink) Old Dec 2nd, 06, 2:40 PM Thread Starter
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Re: Arias pistons question...

Sorry, fyi they are circa 1985. Found newspaper used for packing in the boxes.

Chris

70 Chevelle
454 .030
10.78 @ 122.89....1.48 60'
http://s270.photobucket.com/albums/j...afilter=images
moonbeam1999 is offline  
post #13 of 24 (permalink) Old Dec 2nd, 06, 3:09 PM Thread Starter
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Re: Arias pistons question...

Sorry, one more pic. Also very curious about how the valve reliefs are cut differently in the two dome sizes. This one (smaller dome) has relief cuts for intake and exhaust. The other I posted previously has one and not the other????

http://www.putfile.com/pic.php?img=4151010

Chris

70 Chevelle
454 .030
10.78 @ 122.89....1.48 60'
http://s270.photobucket.com/albums/j...afilter=images
moonbeam1999 is offline  
post #14 of 24 (permalink) Old Dec 2nd, 06, 4:49 PM
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Re: Arias pistons question...

those pics, some are small block, some a BB. the ones with an angle in the middle of the dome are BB. the domed SBC are very high compression, 12.5:1 or more. the flattop SBC are machined that way with equal size valve pockets so they're interchangeable left and right. probably a race piece with no pin offset either. Those BB pistons look like a pretty big dome too. Careful, make sure you know what you want and that these will make it.

Tom
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post #15 of 24 (permalink) Old Dec 2nd, 06, 5:01 PM
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Bill R
 
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Re: Arias pistons question...

K'woodKen,

Press fit rings!!!?? I think someone is pulling your chain. Heating the pistons and hammering the rings in would make the rings totally ineffective, as far as sealing the cylinder goes. Besides, how would you compress the rings to install the pistons into the cylinders??
You're are probably just joking, but remember there are a lot of people reading these posts who might just think you are serious.

Bill
64 Chevelle Malibu Sport Coupe (original owner) car now has 427" BB, Jerico 5-spd. trans., Dana 60 rear end.

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