The differences between N52 and N51 pistons

John@BPC · 07-11-2017, 09:05 AM

Ever wondered what's different between a N51 and a N52 rod/piston? As you can see the connecting rod on the N52 assembly is much thicker. The N52 also has less chamfer on the piston head edge to give the engine higher compression. Just thought this would be interesting to share with the community since its not everyday you see these 2 pistons side by side.

W37V · 07-11-2017, 09:20 AM

You were right. This is interesting.

E91 M Sport · 07-11-2017, 12:03 PM

Saw this on your IG. Thanks for sharing

JohnG7 · 07-11-2017, 09:43 PM

Interesting pictures. These are much appreciated.

Does anyone know of similar pics of S54/N54 rod/pistons? Would love to compare the 3/3.2 liter differences.

tlow98 · 07-12-2017, 01:13 AM

Nice! Surprising the Ross are so much thinner given the same output.

CobraMarty · 07-12-2017, 04:33 PM

Does the N52 have a thicker/taller 1st ring land? I mean from the top ring to the top piston edge.

Eagle1oh7 · 07-13-2017, 03:27 AM

So what exactly does this mean for the SC and Headers project you guys have going on your N52 customer car?

John@BPC · 07-13-2017, 08:37 AM

Quote:

Originally Posted by CobraMarty

Does the N52 have a thicker/taller 1st ring land? I mean from the top ring to the top piston edge.

No there is just more chamfer on the edge of the piston so at that angle it makes it appear that the N52 Piston has a larger thicker first piston ring land.

07-11-2017, 09:05 AM	#1
John@BPC 318 Rep 203 Posts Drives: BMW M3, M4, M5 Join Date: Jun 2016 Location: Raleigh iTrader: (0)	The differences between N52 and N51 pistons Ever wondered what's different between a N51 and a N52 rod/piston? As you can see the connecting rod on the N52 assembly is much thicker. The N52 also has less chamfer on the piston head edge to give the engine higher compression. Just thought this would be interesting to share with the community since its not everyday you see these 2 pistons side by side. Attached Images
	Appreciate 5 David0ff1059.00 N52UNED179.00 JohnG716.00 E91 M Sport103.00 Jeffeypoo5.50 Tweet Quote

07-11-2017, 09:20 AM	#2
W37V [Oo=\|\|=oO] 1103 Rep 2,470 Posts Drives: e92n52 & f15n57 Join Date: Aug 2014 Location: DMV iTrader: (0)	You were right. This is interesting.
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07-11-2017, 12:03 PM	#3
E91 M Sport First Lieutenant 103 Rep 385 Posts Drives: 2012 E91 M Sport Join Date: Aug 2015 Location: Sunny SD iTrader: (0)	Saw this on your IG. Thanks for sharing __________________ 2012 E91 MSPORT • ST COILOVERS • TSW BATHURST
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07-11-2017, 09:43 PM	#4
JohnG7 Private 16 Rep 58 Posts Drives: E89 + F30 Join Date: Oct 2015 Location: south of Houston... iTrader: (0)	Interesting pictures. These are much appreciated. Does anyone know of similar pics of S54/N54 rod/pistons? Would love to compare the 3/3.2 liter differences.
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07-12-2017, 01:13 AM	#5
tlow98 Major General 2188 Rep 5,002 Posts Drives: 2009 E91, 2014 F15 x35i Join Date: Aug 2011 Location: Bay Area iTrader: (2)	Nice! Surprising the Ross are so much thinner given the same output.
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07-12-2017, 04:33 PM	#6
CobraMarty Major 619 Rep 1,402 Posts Drives: 2007 328xi e90 + e92 Join Date: Sep 2010 Location: BimmerMILVs.com iTrader: (7)	Does the N52 have a thicker/taller 1st ring land? I mean from the top ring to the top piston edge.
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07-13-2017, 03:27 AM	#7
Eagle1oh7 Lieutenant Colonel 287 Rep 1,710 Posts Drives: '11 328i Sedan Join Date: Oct 2012 Location: Chula Vista CA iTrader: (0)	So what exactly does this mean for the SC and Headers project you guys have going on your N52 customer car? __________________ DONE: Seibon CF Hood, M3 Rep, MSport rear w/DD CF Diffuser, M3 Rep Skirts, Seibon CSL trunklid, Forgestar F14 18s w/Michelin PSS, Eisenmann catback, AA Headers, BPC Stage 2, Charcoal Delete+revMotor+AFE Drop In filter FUTURE MODS: LED headlights, CF rooftop, M3 Suspension Conversion, Dinan CAI Mod
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