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Old 09-10-2011, 04:07 AM   #1
AVANTI R5
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Default BMW Patents Turbo V6 Engine. F80 M3 Application?

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UPDATE: We've added higher-quality schematics, including the shown variants.

Rumors of BMW considering V6 engines have been floating around for quite some while now. One possible future application often mentioned when talking about such an engine is the upcoming F80 M3 (F82 M4).

As we reported earlier, BMW was studying no less than four potential engine choices for the next M3. While the V8 options (S63 4.4l V8 or turbocharged S65 from the current E9x M3) weren't likely, a 3.2L inline 6 with three turbochargers was and probably still is the more likely choice.

But, to add more fuel to the speculation, we've just discovered that BMW has filed a patent for a unique twin-turbo V6 engine last year. Have a look at this schematic BMW submitted to the German patent office to describe the patent filing:



As BMW describes in their patent application, this image shows "the principle of this turbocharger layout invention (#1) in a 6-cylinder internal combustion engine in V configuration (#2) with a first cylinder bank (#2a) -- pictured as 3 circles and labeled with Z -- and a second cylinder bank (#2b) -- also pictured as 3 circles labeled with Z."

Remarkable is the particular invention. According to these schematics, the exhaust gases of all 6 cylinders are routed into one turbocharger (#4) which BMW says may also be a twinscroll turbo (see images below, figures 3 and 5). After leaving the first turbocharger, the exhaust gases can be routed either into the exhaust system or into another turbocharger (#5). So this alludes to a sequential turbo layout. The patent application also mentions that this allows different sizes for both turbos.

*IF* this new engine was actually produced and used in the next M3, we would assume that BMW goes for a smaller twin-scroll as the first turbo, with a larger second turbocharger. All that being said, this patent filing doesn't necessarily mean they actually will use a V6 anytime soon, or at all. Patented inventions often get dismissed before making it to series production. At the very least however, this shows that BMW has (or is) actually considering V6 engines and how to make the related turbocharging as efficient and responsive as possible.

We'll try to update the subject as we get new information on possible F80 M3 engines.
Follow our F80 M3 coverage in the meantime: http://www.bimmerpost.com/m3/f30m3/
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Old 09-10-2011, 05:41 AM   #2
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Very Interesting, obviously a lot of power can be made with twin turbo V6 engines, should be interesting to see what they do.
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Old 09-10-2011, 08:49 AM   #3
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And the current biggest I6 producer dies.
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Old 09-10-2011, 09:09 AM   #4
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The Z stands for zylinder.

The description text does not match the shown diagram, the diagram shows the exhaust stream split before turbine 4a, where it also could be routed to turbine 5a, not after.

I was reading about the tri-turbo configuration and wanted to find out more about the "electric spooler" associated with that, obviously it's not related to this patent request.

Last edited by Vlad; 09-10-2011 at 09:18 AM.
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Old 09-10-2011, 09:10 AM   #5
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And the current biggest I6 producer dies.
Ya, I was thinking about that. I hope they don't get rid of the I6.
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Old 09-10-2011, 09:22 AM   #6
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The engine options listed for the upcoming M3 are not laid out straightforward.

What the article is trying to say, is that the most likely upcoming engine for the M3 .... is an Inline 6.

It would be an inline 6 with two "regular" turbocharges and one "electric spooler".
They call it tri-turbo.
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