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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, 08:22 AM   #1
tscdennab
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The N54 engine pistons are cast (and not forged).

I have contacted Mahle and gave them all the details needed in order to identify the piston type in the N54 engine (following a rumor stating that they are forged).

Here is an excerpt of the answer I have received:

"Thanks for your reply.

With the chassis number we found more details.
It is a cast piston.

Further we can say, that we have the part only in OE and not in our aftermarket range. "

Last edited by tscdennab; 06-07-2011 at 08:32 AM.
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      06-07-2011, 08:32 AM   #2
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hmm well I guess the cast piston can handle some serious boost then it seems...

unfor was under the impression everything was forged correct? Wasnt he running 28psi on stock block?

Thanks for the info
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      06-07-2011, 08:34 AM   #3
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Rods are forged
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      06-07-2011, 08:35 AM   #4
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OP is just jelly because he got a N55
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      06-07-2011, 08:43 AM   #5
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Quote:
Originally Posted by ridin135 View Post
Rods are forged
So the pistons are the only cast internals? It seems like even though the pistons are cast it they are doing just fine for the power numbers some of these guys are making out here.
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      06-07-2011, 08:58 AM   #6
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Not true.
People have opened the motor and have found the rods / pistns to be forged.
Mahle just looked up a part number.
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      06-07-2011, 09:08 AM   #7
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Quote:
Originally Posted by unfor View Post
Not true.
People have opened the motor and have found the rods / pistns to be forged.
Mahle just looked up a part number.
+10000, I'm still searching around to show the OP is totally wrong
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      06-07-2011, 09:26 AM   #8
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my pistons were forged as well as the rods . Confirmed by my shop when they opened the engine.
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      06-07-2011, 09:28 AM   #9
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Quote:
Originally Posted by enrita View Post
my pistons were forged as well as the rods . Confirmed by my shop when they opened the engine.
There we go.
Thanks enrita.
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      06-07-2011, 10:23 AM   #10
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Is it possible that both answers are right? That at a certain production date or year BMW changed the part to reduce costs?
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      06-07-2011, 10:30 AM   #11
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could be actually see part numbers:
01 Piston (0) 6 07/2007 11257561698 ENDED
01 Piston (0) 6 12/2009 11257577581 $354.95


which could also mean i have cast pistons now which would suck big time...
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      06-07-2011, 10:30 AM   #12
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or that the n55 has cast and the n54 has forged....
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      06-07-2011, 10:38 AM   #13
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My N54 motor, build date August 2006, has forged pistons.
N55 has cast ones to save cost.
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      06-07-2011, 10:46 AM   #14
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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.
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      06-07-2011, 10:48 AM   #15
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LOL... Me too.

One more reason why n54 is superior to n55...
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      06-07-2011, 11:15 AM   #16
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holy shit - i learn something new uurrday.

my car has forged pistons/rods.

nice......
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      06-07-2011, 11:16 AM   #17
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Quote:
Originally Posted by enrita View Post
my pistons were forged as well as the rods . Confirmed by my shop when they opened the engine.
If they were forged maybe your engine wouldn't break ? A forged piston should hold much more power than like 450whp.

I wish they were forged. But why would BMW advertise "forged crankshaft" in their N54 documentation, and not also "forged pistons" ?

Also, how can a shop tell if a piston is cast or forged ?

enrita, did you by any chance noted the piston's "code" which was stamped on it ? I can send that code to someone at Mahle and he can look up for sure.
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      06-07-2011, 11:19 AM   #18
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Quote:
Originally Posted by werke-t View Post
YAAAY! i have a 11/06 build, got me worried for a minute...

shitty news for n55 guys though.
+1. Impressive! Keeping mine forever! LOL
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      06-07-2011, 11:24 AM   #19
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Quote:
Originally Posted by tscdennab View Post
If they were forged maybe your engine wouldn't break ? A forged piston should hold much more power than like 450whp.

I wish they were forged. But why would BMW advertise "forged crankshaft" in their N54 documentation, and not also "forged pistons" ?

Also, how can a shop tell if a piston is cast or forged ?

enrita, did you by any chance noted the piston's "code" which was stamped on it ? I can send that code to someone at Mahle and he can look up for sure.
Low blow. You should probably go back and read why it broke. Forged or cast wouldn't have mattered at that point.
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      06-07-2011, 11:25 AM   #20
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Quote:
Originally Posted by tscdennab View Post
If they were forged maybe your engine wouldn't break ? A forged piston should hold much more power than like 450whp.

I wish they were forged. But why would BMW advertise "forged crankshaft" in their N54 documentation, and not also "forged pistons" ?

Also, how can a shop tell if a piston is cast or forged ?

enrita, did you by any chance noted the piston's "code" which was stamped on it ? I can send that code to someone at Mahle and he can look up for sure.
His engine didnt break from power....
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      06-07-2011, 11:38 AM   #21
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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.
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      06-07-2011, 11:42 AM   #22
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Quote:
Originally Posted by tscdennab View Post
If they were forged maybe your engine wouldn't break ? A forged piston should hold much more power than like 450whp.

I wish they were forged. But why would BMW advertise "forged crankshaft" in their N54 documentation, and not also "forged pistons" ?

Also, how can a shop tell if a piston is cast or forged ?

enrita, did you by any chance noted the piston's "code" which was stamped on it ? I can send that code to someone at Mahle and he can look up for sure.
you are such a douche
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