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Old 02-12-2014, 07:35 PM   #26
gfx2043
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As stated above just over 350 AWHP on 93 at 21-22 psi and 437 AWHP on 24 psi and E85. Motor has over 22K on the clock now and consumes very little oil ~.25 qt per 3K miles.
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Old 02-12-2014, 10:52 PM   #27
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I too have been looking into the 4032 piston options, ended up going with 9:1 4032 wossner pistons. They literally just showed up at my door step.
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Old 02-13-2014, 03:35 AM   #28
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Originally Posted by gfx2043 View Post
As stated above just over 350 AWHP on 93 at 21-22 psi and 437 AWHP on 24 psi and E85. Motor has over 22K on the clock now and consumes very little oil ~.25 qt per 3K miles.
Oh sorry didn't realize you were the same person, awesome, thanks for the feedback
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Old 02-13-2014, 11:43 AM   #29
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Quote:
Originally Posted by rymaggi View Post
I too have been looking into the 4032 piston options, ended up going with 9:1 4032 wossner pistons. They literally just showed up at my door step.
Wossner? I'm not familiar with them. Got a link?
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Old 02-13-2014, 11:59 AM   #30
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http://www.wossnerpistons.com/produc...=Sport+Compact


When I was researching piston options for my EJ207 it seemed like some guys over the pond have good experiences with em
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Old 02-13-2014, 12:00 PM   #31
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Wossner? I'm not familiar with them. Got a link?
Here are some pictures of them.









Purchased them through built industries.
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Old 02-13-2014, 12:12 PM   #32
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Originally Posted by rymaggi View Post
I too have been looking into the 4032 piston options, ended up going with 9:1 4032 wossner pistons. They literally just showed up at my door step.
Ive heard good things about them to, just think i will go with male because they are almost exact stock forged replacements, which is the route id like to go, but the wossner's look really nice, def give us feedback once they are in the car
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Old 02-13-2014, 12:15 PM   #33
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We went with them because the ring lands looks a bit "beefier"


Also, didn't find any bad reviews, as with the Mahle's there are mixed, but usually there is always mixed reviews.

A little comparison.

vs
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Old 02-13-2014, 12:17 PM   #34
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There is some info in my "threads started" under "piston with least piston slap"
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Old 02-13-2014, 02:26 PM   #35
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There is some info in my "threads started" under "piston with least piston slap"
just read, awesome stuff, hmm, now i would consider the wossner's to, they seem like a really nice piston, plus, who does't like fine german engineering , mahle are certainly a good piston from what I've read, and considering there factory and race use throughout the world in F1 and by audi as there motorsport piston
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Old 02-13-2014, 02:34 PM   #36
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I have a set of Mahle pistons on my desk with shattered and melted ringlands but besides that I don't have a lot of experience using them. My understanding of them is that they are a quiet economical piston good for slightly higher than stock power levels.
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Old 02-13-2014, 02:45 PM   #37
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I have a set of Mahle pistons on my desk with shattered and melted ringlands but besides that I don't have a lot of experience using them. My understanding of them is that they are a quiet economical piston good for slightly higher than stock power levels.
yea, i read a few posts that say this, i believe that is due to a tune which wasn't very good, seems like they don't take lightly to too much power and set, which is fine considering my car is gonna stay on 93 with a VF turbo
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Old 02-14-2014, 12:12 AM   #38
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I have a set of Mahle pistons on my desk with shattered and melted ringlands but besides that I don't have a lot of experience using them. My understanding of them is that they are a quiet economical piston good for slightly higher than stock power levels.
how did yours fail?, curious as to why, what power levels were you at etc?
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Old 02-14-2014, 10:46 AM   #39
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how did yours fail?, curious as to why, what power levels were you at etc?
I really don't know, I bought it from someone else. The engine had 17k on it when it blew up. I bought the entire shortblock for $150. Rod and mains bearings looked great. The STi rods in it looked straight and clean. Two ringlands shattered on a one piston only. The other 3 looked reasonably good. The cylinder the piston came out of is ruined and the block is only good for sleeving, which is why I bought the block.
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Old 02-14-2014, 01:57 PM   #40
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Shattered and melted is a sign of detonation. Pitting/melting is a sure sign of it. All pistons will fail under detonation regardless of the material they are made from. To me this is more of of how they fail under detonation.
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Old 02-14-2014, 02:09 PM   #41
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Im currently running the Mahle 4032 with 6500 miles around 380whp/380wtq on Dom 1.5. About to finish the tune if this new South Bend Clutch can take the abuse. They are quite pistons even though I do have little higher than normal PTW.

On those wossner pistons above. Do they have gas ports on the oil ring? Also is the wrist pin force feed oil? I can't tell by the pics
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Old 02-14-2014, 02:42 PM   #42
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Shattered and melted is a sign of detonation. Pitting/melting is a sure sign of it. All pistons will fail under detonation regardless of the material they are made from. To me this is more of of how they fail under detonation.
Very likely so, but with such severe detonation to crack a ring land on a forged piston, the bearings looked great. Again, not my engine when it was tuned so I have no idea how bad it was.
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Old 02-14-2014, 10:52 PM   #43
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Very likely so, but with such severe detonation to crack a ring land on a forged piston, the bearings looked great. Again, not my engine when it was tuned so I have no idea how bad it was.
Hmm, you may never know, hoping I get more posts in here on them
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Old 02-14-2014, 11:22 PM   #44
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Hmm, you may never know, hoping I get more posts in here on them
Let us know how it goes. I'm genuinely interested in how they perform. They seem like a great piston for stock-like quiet performance at slightly higher-than-stock power levels.
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Old 02-15-2014, 01:40 AM   #45
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My issue with 4032 is what happens when they fail. They crack, shatter or pretty much disintegrate on heavily boosted applications increasing the probability of a catastrophic failure. Damage in 4032 also continues to spread out from the area it occurred. If the day will NEVER come where you say, "Lets see what she can do" i say go for it. They are perfect for normal applications.

2618 on the other hand will bend without shattering since its the softer metal. These are way more forgiving of a bad tune They don't have to be diesel loud if the machining is right. My car probably makes a little bit of noise below freezing but it isn't even audible from the outside of the car. Unless you have a racecar there really is no reason to run such loose tolerances which makes 2618 a serious choice for normal folks. 2618 has gotten a bad rep for daily's but the problem is really the machine shops doing the work.
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Old 02-15-2014, 02:05 AM   #46
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My issue with 4032 is what happens when they fail. They crack, shatter or pretty much disintegrate on heavily boosted applications increasing the probability of a catastrophic failure. Damage in 4032 also continues to spread out from the area it occurred. If the day will NEVER come where you say, "Lets see what she can do" i say go for it. They are perfect for normal applications. 2618 on the other hand will bend without shattering since its the softer metal. These are way more forgiving of a bad tune They don't have to be diesel loud if the machining is right. My car probably makes a little bit of noise below freezing but it isn't even audible from the outside of the car. Unless you have a racecar there really is no reason to run such loose tolerances which makes 2618 a serious choice for normal folks. 2618 has gotten a bad rep for daily's but the problem is really the machine shops doing the work.
Definitely a good opinion, I'm sure they are ideal, especially if you are a power fiend then it's the smarter choice, me personally I've had 2 subarus over the past 3 years and both have made me quite happy at stage 2, I really don't have any desire to go past that, it makes the sti the perfect daily, reliable and fast, hence why I think 4032 really is perfect for my build
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Old 02-18-2014, 01:21 PM   #47
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bumpppp
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Old 02-18-2014, 04:33 PM   #48
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Are you going to run forged rods?

Last edited by Purpose_Built; 02-18-2014 at 04:43 PM.
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Old 02-18-2014, 05:01 PM   #49
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Are you going to run forged rods?
No, brand new Oem shortblock
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Old 02-19-2014, 06:31 PM   #50
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but with such severe detonation to crack a ring land on a forged piston, the bearings looked great.
I have disassembled an engine with VERY strong Roger Clark Motorsport Omega forged pistons COMPLETELY destroyed by detonation (mixture way too lean by failing fuel pump and motorsport ECU without knock control) all bearings looked like new.

After this experience, to me all stories about bearing damage caused by detonation are complete BS!
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