Engine performance variance - BMW 3-Series (E90 E92) Forum

chrissal1 · 08-26-2005, 10:06 AM

Hi,

I remember reading a while ago (on a BMW forum) that there can be as much as 10% performance difference with like engines.

From what I can remember, the difference is due to the manufacturing process. If an engine is machined using new bits, the engine will perform noticeably better. If the engine is machined using an older (more worn out) bit, the engine wouldn't perform as well.

Anyway, I just wanted to bring this up to you guys to see if this is indeed true.

Thanks,
Chris

Socom · 08-26-2005, 10:37 AM

Heard that as well. These cars are mass produced afterall.

E90Fleet · 08-26-2005, 11:17 AM

With BMW's tolerances the variation is much smaller than that

08-26-2005, 10:06 AM	#1
chrissal1 Second Lieutenant Drives: 335i Join Date: Jun 2005 Location: Houston, TX Posts: 233 iTrader: (0)	Engine performance variance Hi, I remember reading a while ago (on a BMW forum) that there can be as much as 10% performance difference with like engines. From what I can remember, the difference is due to the manufacturing process. If an engine is machined using new bits, the engine will perform noticeably better. If the engine is machined using an older (more worn out) bit, the engine wouldn't perform as well. Anyway, I just wanted to bring this up to you guys to see if this is indeed true. Thanks, Chris
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08-26-2005, 10:37 AM	#2
Socom Brigadier General Drives: 2010 335D Join Date: May 2005 Location: USA Posts: 4,394 iTrader: (0)	Heard that as well. These cars are mass produced afterall.

08-26-2005, 11:17 AM	#3
E90Fleet Major General Drives: BMW Join Date: Apr 2005 Location: South Africa Posts: 6,815 iTrader: (0)	With BMW's tolerances the variation is much smaller than that