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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 12-03-2012, 06:44 PM
sledge07 sledge07 is offline
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Sacrificial cylinder?

I recently heard of the notion of a sacrifical cylinder on most turbo charged engines. Is this true for the 335i (2007)? If so does it explain my needing a new coil on number three in February and a new injector on number three in November?
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  #2  
Old 12-03-2012, 07:10 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by sledge07 View Post
I recently heard of the notion of a sacrificial cylinder on most turbo charged engines. Is this true for the 335i (2007)? If so does it explain my needing a new coil on number three in February and a new injector on number three in November?

A cutting edge concept....give us a reference!

Now, so far as I know, BMW has not spec'd any sacrificial cylinders in their engines, needing all of them for locomotion as they do, perhaps now the design of yesteryear.

However. The Volkswagen Group may have done so covertly, accounting for their sluggardly performance, Bugatti excepted.

GM is reputed to be far along in development of same, in submissive compliance with Obama Administration guidelines. Ford has refused to participate.

Please keep us posted on this!!!!
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  #3  
Old 12-03-2012, 10:02 PM
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Is the cylinder a virgin?
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Old 12-03-2012, 10:55 PM
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Is the cylinder a virgin?
I would tend to doubt it - rather the opposite, don't you think? Thousands of times per minute...I prefer not to imagine it too vividly.
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Old 12-04-2012, 06:38 AM
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DSXMachina DSXMachina is offline
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I would tend to doubt it - rather the opposite, don't you think? Thousands of times per minute...I prefer not to imagine it too vividly.
Too late. What one has imagined one cannot unimagine.

The OP is kind of correct, he just has his parts mixed up a little. The sacrificial part is the HPFP. BMW designed it so that it acts much like a fuse on a circuit board. As soon as the HPFP detected a flaw anywhere in the engine it gave up the ghost so as to protect the mechanicals from further damage. The Japanese later perfected the technology (as always) by making their HPFPs act more like automatically resetting circuit breakers.
Now that BMW has bought the technology from Nippondenso there are no more HPFP failures, and all is well with N54 engines.
I have no idea how those crazy internet rumors get started.
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Old 12-04-2012, 08:04 AM
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I would tend to doubt it - rather the opposite, don't you think? Thousands of times per minute...I prefer not to imagine it too vividly.
Not speaking for any of the gods of the internal combustion engine, but if I were one of the gods, I would insist on a virgin.
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