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Old 09-11-2013, 09:22 PM   #51
Homemade WRX
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Ah, the age old problem of having your cake and eating it too. It really is a tight line to keep between loose enough for a high power customer (which a lot of the comments in here aren't) and being quiet and tight enough for normal DD action.

A lot of builds come out on the loose side, as noisy is better than broken. Not ideal but the lesser of two evils for sure!

If you are low enough power, talking to most of you factory location guys, you should ask you builder about a 4032 option.

Just my $0.02,
Micah
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Old 09-12-2013, 06:05 AM   #52
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Ive started using JE fsr pistons exclusively on most all of our builds. Very quiet piston. Has a decent amount of offset.
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Old 01-30-2014, 12:25 PM   #53
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Bump. Great discussion so far, keep it up guys.

Some updates:

We opened up the engine a few days ago. Heads look perfect but we still dropped em off at the machine shop for a full refresh so they are 110% (lol)

Short block looks great: piston tops look flawless, and 3 of the cylinder walls look flawless, still cross-hatched and round. #4 has 1 tiny little scratch on it: BARELY enough to catch a fingernail on. And I mean barely.

So looks like we're working with a fairly fresh engine.

So we have decided to go "drop-in" route. So stock bore with a thorough honing.
We also decided for sure that we're going with the 4032 alloy. This car will be daily driven and not tracked, and will be on e85 exclusively for all of the spirited driving activity.

So right now it comes down to these choices:
Mahle
Supertech

We have everything here besides the pistons. Still going back and forth on which way to go with those, so your experience/input/suggestions on which to go with and which to avoid and why are VERY APPRECIATED.

Thanks all.
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Old 01-30-2014, 01:56 PM   #54
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Just throwing out Wossner as another option in 4032. Personally I might choose that over the others. Could also do the Cosworth pistons. They aren't 4032 but it's similar. I like those the best but they're also stupid expensive.
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Old 01-30-2014, 01:58 PM   #55
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Yeah I think that's really the biggest issue with Cosworth: they cost a fortune, and I just don't see them being 200% better than the others listed.

I'll have to check out Wossner, not a brand I've heard a lot about before.
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Old 01-30-2014, 03:25 PM   #56
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Looks like Wossner is pretty decent as well.

So now its Mahle vs Wossner
I can't really find much info or feedback for supertechs on a subaru so I'd rather not go with those. (although in the turbo miata world they seem to be the most popular piston used)

Input?

Both seem to have good reviews, though I'm looking at pictures and to me the Wossner ringland thickness looks quite a bit bigger, which is a good thing in my opinion:

vs
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Old 01-30-2014, 09:40 PM   #57
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Quote:
Originally Posted by VladiWrX View Post
Looks like Wossner is pretty decent as well.

So now its Mahle vs Wossner
I can't really find much info or feedback for supertechs on a subaru so I'd rather not go with those. (although in the turbo miata world they seem to be the most popular piston used)

Input?

Both seem to have good reviews, though I'm looking at pictures and to me the Wossner ringland thickness looks quite a bit bigger, which is a good thing in my opinion:

vs
I don't have any experience with them, but rallispec is using supertechs in their "street spec value" shortblock.
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Old 01-30-2014, 10:54 PM   #58
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I have Mahle 4032 99.75mm pistons in my hybrid block. They are dead quiet for a forged piston. A lot of people are surprised when I tell them I have a built block because my engine runs so quietly at startup.

However, I also think that the machining played a big part. I wasn't going for big power, and I asked my machinist to get the PTW clearances tight. It's been running great so far.
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Old 01-30-2014, 11:04 PM   #59
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Manley platinum series, 25k miles IAG built, no oil consumption

Loud for like 3 minutes then not a peep after warmed up
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Old 01-31-2014, 12:12 AM   #60
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Quote:
Originally Posted by 03SubyWRX View Post
I have Mahle 4032 99.75mm pistons in my hybrid block. They are dead quiet for a forged piston. A lot of people are surprised when I tell them I have a built block because my engine runs so quietly at startup. However, I also think that the machining played a big part. I wasn't going for big power, and I asked my machinist to get the PTW clearances tight. It's been running great so far.
We're aiming for 400-450whp
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Old 01-31-2014, 01:27 AM   #61
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Quote:
Originally Posted by rymaggi View Post

We're aiming for 400-450whp
Not exactly alot of power. Stock block can handle 400whp. Flip a coin and be happy. Noise will be minimal with any piston as long as the ptw is tight.
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Old 01-31-2014, 08:03 AM   #62
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400whp and you are looking Mahles? I would look elsewhere
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Old 01-31-2014, 09:46 AM   #63
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Thanks a lot for the input guys, and keep it coming.

I'm planning on pulling the pistons in the next day or two, measuring the bores, then REALLY deciding on which bore size to go with and/or whether we'll be machining or just honing the block.

I feel like the thread title is very misleading here: we both realize that there's a whole lot more to what we're asking here besides "LEAST PISTON SLAP", and yes of course we are planning on running relatively tight clearances for least oil consumption/blowby, quietness, and as close to OEM as we can stay.
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Old 01-31-2014, 09:50 AM   #64
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How many miles are you hoping to get? 50K, 100K?

I was impressed by the quality of Wossner when I saw them at the 2013 SEMA stand.
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Old 01-31-2014, 09:58 AM   #65
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Not really sure actually. 100k maybe? Anything over 50k would be good though.

Yeah, I'm liking them a lot after comparing design to some of the others, like mahle, but I'm just going off specs and pictures here, so I have no idea. The goals here are nothing drastic, and car will be on e85 so I don't see the need for super strong slugs that need loose tolerances and possibly a rebuild much sooner.

The biggest thing right now is finding feedback on them from subaru owners/builders: seems like they're relatively new and while I've read only positive reviews and feedback so far, I'd like to hear if anyone had any issues with Wossner. The plan B here will probably be Mahle, since plenty of people even in this thread already reported good results.
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Old 01-31-2014, 05:41 PM   #66
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Bump.
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Old 02-01-2014, 11:32 PM   #67
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GTtuner on Legacygt.com has been running the Wossner's on his EJ255 for a couple of years with good success. I wish Wossner make a 99.75mm piston
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Old 02-01-2014, 11:36 PM   #68
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Quote:
Originally Posted by V8 GTFO Lesbic WGN View Post
How many miles are you hoping to get? 50K, 100K?

I was impressed by the quality of Wossner when I saw them at the 2013 SEMA stand.
I'm shooting for 60-70k on my Manleys, halfway there
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Old 02-01-2014, 11:37 PM   #69
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Quote:
Originally Posted by Homemade WRX View Post
Ah, the age old problem of having your cake and eating it too. It really is a tight line to keep between loose enough for a high power customer (which a lot of the comments in here aren't) and being quiet and tight enough for normal DD action.

A lot of builds come out on the loose side, as noisy is better than broken. Not ideal but the lesser of two evils for sure!

If you are low enough power, talking to most of you factory location guys, you should ask you builder about a 4032 option.

Just my $0.02,
Micah
yeah mine are noisy for about 3minutes (I warm it up by idling for 2 minutes) after starting up then quiet down to nothing
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Old 02-02-2014, 01:22 AM   #70
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Thanks for the replies. I'll check out GTtuners thread
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