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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > The N54 engine pistons are cast (and not forged).



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      06-07-2011, 05:29 PM   #111
unfor
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Guys,
I just found out the pistons are rubber.
Sorry.
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      06-07-2011, 05:30 PM   #112
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so the only thing that breaks when i boost the turbos to 19psi is the turbos niceee
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      06-07-2011, 05:31 PM   #113
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Quote:
Originally Posted by unfor View Post
Guys,
I just found out the pistons are rubber.
Sorry.
I can confirm this.
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      06-07-2011, 05:31 PM   #114
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lettuce be reality guys, Detroit Pistons.
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      06-07-2011, 05:33 PM   #115
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Quote:
Originally Posted by rader1 View Post
So are saying the pistons are forged because they had a dish? That has nothing to do with if its forged or not. A forged piston can be dished, flat top or have a dome. You may or may not be able to visually tell if a piston is forged, but a forged piston is noticeably lighter(less weight) than a cast piston of the same size. Pick up a cast piston and then a forged piston and you'll def know which is which. And the rods are forged steel, aluminum is NEVER a viable option on a street engine, much less a OEM warranteed engine. If in fact Audi is using an aluminum rod in something, I would love to know exactly how they are planning on doing the block swaps on a monthly basis. I don't know a helluva lot about the specifics of the DME or fueling system of the N54, but I AM a machinist by trade and can offer some incite into the why certain engine parts are used and others aren't. And with that said, I haven't disassembled an N54 or seen any pistons first hand so I have no idea if the pistons are forged. But i'll tell you this, forged rods and pistons are FAR higher on the list of must haves than a forged crank...
Unfor already replied to this;

I had a shop open the motor up to determine any upgrade routes or to see how much HP it should support. They took the piston and compared it to some other cast BMW pistons. The pistons were forged and comporable to something like Wiseco.
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      06-07-2011, 05:34 PM   #116
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Originally Posted by zeel View Post
lettuce be reality guys, Detroit Pistons.
Lettuce?
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      06-07-2011, 05:40 PM   #117
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Quote:
Originally Posted by Elie335 View Post
Unfor already replied to this;

I had a shop open the motor up to determine any upgrade routes or to see how much HP it should support. They took the piston and compared it to some other cast BMW pistons. The pistons were forged and comporable to something like Wiseco.
If the shop was a good one(which i'd say it was) then id go with what they said. As far as Mahle saying they're cast? I think there was a miscommunication somewhere, IT MAKES NO SENSE to use cast pistons and a forged crank.
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      06-07-2011, 05:46 PM   #118
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Quote:
Originally Posted by rader1 View Post
If the shop was a good one(which i'd say it was) then id go with what they said. As far as Mahle saying they're cast? I think there was a miscommunication somewhere, IT MAKES NO SENSE to use cast pistons and a forged crank.
agreed, Mahle misunderstood the OP question, OP gave them out a late 2009 vin number and Mahle reply wasn't clear and "very possibly" referred to late model N54s (Dec 2009+)...

No question was dedicated or referred to the old built date N54... So...

Remember, 3 guys with earlier built date engines opened their engine in a reputable shops and got confirmed by their shops that pistons are forged.

I think that's enough as I agree with you, it make NO sense to use a cast pistons and forged crank.
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      06-07-2011, 06:32 PM   #119
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Quote:
Originally Posted by unfor View Post
Guys,
I just found out the pistons are rubber.
Sorry.
Oh nice you opted to get the rubber pistons. I knew I f__ed up when I requested my pistons to be made of styrofoam.
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      06-07-2011, 06:40 PM   #120
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Quote:
Originally Posted by werke-t View Post
Quote:
Originally Posted by unfor View Post
My N54 motor, build date August 2006, has forged pistons.
N55 has cast ones to save cost.
YAAAY! i have a 11/06 build, got me worried for a minute...

shitty news for n55 guys though.
Me too 08/06!! Gyeah!!
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      06-07-2011, 06:41 PM   #121
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I heard from my SA that the forged internals came with the sport package...

(<-- That means I'm kidding FYI)
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      06-07-2011, 07:10 PM   #122
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Quote:
Originally Posted by unfor View Post
When I pulled my motor towards the beginning of the ST thread, I can confirm that both components (rods and pistons) are forged. I don't know if this changed during the life of the N54, but I know that for my build date, I can 100% guarantee that both components were forged. Also, the same build date had a bolted diff, so maybe they changed during the switch to welded. Who knows.

Mahle can look up any part number they want, but they haven't looked inside the motor. Multiple shops that have pulled these N54 motors (including Cp-e at the time) have all confirmed these forged internals.
I can absolutely confirm that cp-e NEVER disassembled the long block. They removed the engine and trans to mock up a turbo inlet pipe and other parts which continue to be vaporware.

Quote:
Originally Posted by creaminz View Post
Fawk this is like seeing an Asian girl with enormous tits with her clothe on. You wont know if they are real or not until you take it apart. I will just wait until something breaks plus i dont think our engine cant take 450rwhp/tq. Im not here to make 600 to tje wheel so..
I lol'd. Thanks.

I think it would take a pretty experienced eye to spot the difference btw a forged and a cast piston without one or the other to directly compare it to. That said, lostmarine and numerous others have been running around on 500+ whp for a while and Shiv and Terry have literally beat the fuck out of their motors with no issues. Unfor hitting 660 is further evidence that this discussion is rampant speculation and fail. Until someone blows with "cast" pistons being the cause, you can all rest assured that your motors are bombproof.
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      06-07-2011, 08:25 PM   #123
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Thanks boom.
Guys, BOOM is/was ? a cp-e expert. So they never disassembled the block , good to know.
But it does appear more and more the 2006 builds get the good shit, so to speak .
Personally, my car was making 660rwhp and the motor was taking it just fine.
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      06-07-2011, 08:47 PM   #124
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stupid post.

Last edited by Streetluger06; 06-08-2011 at 01:51 PM.
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      06-07-2011, 08:50 PM   #125
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Is this true? Can anyone with confirmed forged pistons confirm that they have a sport package or not?
lol
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      06-07-2011, 08:50 PM   #126
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^lmao, that is how misinformation spreads. wonder how many people now believe sport package=forged internals.
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      06-07-2011, 08:55 PM   #127
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Only sport package leatherette had Forged. Get it right guys.
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      06-07-2011, 09:40 PM   #128
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Quote:
Originally Posted by rader1 View Post
If the shop was a good one(which i'd say it was) then id go with what they said. As far as Mahle saying they're cast? I think there was a miscommunication somewhere, IT MAKES NO SENSE to use cast pistons and a forged crank.
I am by no means disputing what manufacturing process went into making our pistons. HOWEVER, Honda uses a boat load of forged cranks and cast rods and pistons.
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      06-07-2011, 10:32 PM   #129
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Heard the pistons were made from recycled wooden nickels...
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      06-08-2011, 12:05 AM   #130
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Quote:
Originally Posted by unfor View Post
Guys,
I just found out the pistons are rubber.
Sorry.
I lolfarted.
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      06-08-2011, 12:07 AM   #131
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LOL the sa that said that bullsh*t about sport pack getting forged internals should go work for Audi...
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      06-08-2011, 12:37 AM   #132
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LOL the sa that said that bullsh*t about sport pack getting forged internals should go work for Audi...
It was a joke. Hence the "".
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