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Themis
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1,791 Posts
Discussion Starter #1 (Edited)
As there is little to no info across the web regarding the forging of the N14 engine and people that are actually building these are very "silent", starting from this thread about the Mahle Motorsports forged pistons I will continue with a series of threads giving as many info as possible for each aftermarket engine-part I have used into my engine.



PISTONS:


A little intro to the stock Mahle pistons...
They are forged slipper pistons with triple coatings and 77,00mm bore. They also have a special crown design to accommodate the benefits of Direct injection.


Mahle Motorsports Pistons
They were introduced to the world at SEMA March 2012 and they are categorized by Mahle as PowerPak pistons. Some key info about them:
  • Bore 77,50mm
  • Stroke 85,80mm
  • Rod length 138,20mm
  • Pin diameter 20mm
  • CR 10,3 (stock)
  • Compression height 28,50mm
  • Dome volume 1cc
  • Weight 267gr
  • 1,0 - 1,2 - 2,8mm Performance Ring set
  • Clearance guide: Min-0,0010 Max-0,0018
Further details:
  • Part No. code: MCP122051D01
  • Forged triple coated pistons for performance applications
  • Fully machined crown
  • Grafal anti-friction coating on skirts (*)
  • Phosphate-coated to reduce micro-welding and pin-galling (**)
  • Pin bores binished on CNC boring equipment
  • Deburred
  • High strength, light weight steel pins
  • Race proven round wire locks
  • Low drag ring pak
  • Light weight slipper skirt forgings
  • Made by Mahle's M142 alloy (***)
(*): Mahle's Grafal skirt coating reduces drag, scuffing friction and cylinder bore wear as well reduces piston noise.

(**): Phosphate coating provides the grey appearance to the Mahle pistons. This dry lubricant (not to be confused with a thermal film coating) provides a lubricant film in the pin bores and ring grooves until the oiling system of the engine reaches operating pressure, particularly useful during initial start-up or break-in of engines to protect against galling and microwelding. The piston crown is still machinable.

(***): M142 alloy is used by Mahle for increased strength and less thermal expansion. In fact M142 is an Aluminium alloy which allows for tighter cylinder to wall clearances and improved temperature stability. It's a cast of an eutectic aluminum/silicon alloy which contains small amounts of copper and nickel.

mahle 77,5mm MT.jpg


Untitled.jpg


I have not yet taken delivery of my pistons. Once I do, I'll post further photos...
 

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Themis
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1,791 Posts
Discussion Starter #6
I shall be following this closely, really appreciate all the information your finding out for US ALL.
You are welcome!


Nice write up :)

Are these something that should be changed with other bits or can the engine benefit from just putting these in and replacing the stock pistons?
In order to fit these oversized pistons the block should be rectified to the appropriate dimensions which means a larger volume bore, hence more CC into the engine. You can say that there will be some benefits from the increased CC but not too many. Not to mention that these are stronger than the stock forged Mahle pistons.
Once you strip an engine and want the most out of it, then you should really change other bits too...

Once again setting the benchmark, good luck on your project, i have ordered my popcorn for this thread.
Thanks Paul...you will need more than popporn to follow this...

^^ thanks for sharing
Again, You are welcome!

Let my sharing ethics teach others too...
 

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Themis
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1,791 Posts
Discussion Starter #8 (Edited)
Ask Mahle what was the highest boost they achieved on that piston without knock in the lab ?
Welcome Adam...

I don't know what they found in the lab tbh...

What I know by my own experience and FYI is that the stock pistons were put up to the ultimate test at 27psi and they withstood the pressure fine. No det, no knocking, no altered EGTs...and visual inspection mandated that there is nothing wrong about them.
 

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Mahle did the original and Motorsport pistons - they must have the lab data - the max boost , fuel press, timing and inlet temp at which det started on pump gas.
It's not exactly state secrets , but a limit would be awesome from a tuning perspective to obtain , and its a fair question for customers to ask what can I run these suckers at ? As you are selling them ...
 

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Registered
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3,198 Posts
Mahle did the original and Motorsport pistons - they must have the lab data - the max boost , fuel press, timing and inlet temp at which det started on pump gas.
It's not exactly state secrets , but a limit would be awesome from a tuning perspective to obtain , and its a fair question for customers to ask what can I run these suckers at ? As you are selling them ...
 

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Themis
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1,791 Posts
Discussion Starter #11
It would be awesome to obtain the limits, I agree with you, so, Adam, if you have the means to ask Mahle this info I would appreciate it...
It is more likely for them to give the info to a motorsport specialist rather than me.
 

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We've had these sitting on the shelf for quite a while now :thumbup1:

It'll be nice to use them next year and see what abuse they can take :lol:
 

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MIN-Tily Challenged
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7,651 Posts
Mahle did the original and Motorsport pistons - they must have the lab data - the max boost , fuel press, timing and inlet temp at which det started on pump gas.
It's not exactly state secrets , but a limit would be awesome from a tuning perspective to obtain , and its a fair question for customers to ask what can I run these suckers at ? As you are selling them ...
It would be awesome to obtain the limits, I agree with you, so, Adam, if you have the means to ask Mahle this info I would appreciate it...
:iagree:
 
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