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Inside M275 Engine (V12TT) and everything else...

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Inside M275 Engine (V12TT) and everything else...

 
Old 03-23-2009, 07:32 PM
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Arrow Inside M275 Engine (V12TT) and everything else...

I ran across some information about the Mercedes M275 V12 Biturbo engine and wanted to share it with you guys.

This demystified a lot of stuff for me, maybe you guys can pick out some other stuff.

Some of the diagrams are slightly wrong, as they belong to the M285 which is used in the Maybach, it's slightly different - water cooled alternator and 2nd AC compressor.

Pictures are arranged by category.

Also available on in my galleries: http://photo.thegetlucky.com/p749729540




















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Old 03-23-2009, 07:32 PM
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Old 03-23-2009, 07:33 PM
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So far I've learned that the turbos are actually liquid cooled... I had no idea.
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Old 03-23-2009, 08:06 PM
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Good ****, thanks for posting
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Old 03-24-2009, 11:26 AM
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96 and 08 911 turbos
Those turbo units are shockingly expensive for what they are.

good post, thanks.
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Old 03-24-2009, 11:35 AM
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Good post, good pictures.
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Old 03-24-2009, 11:40 AM
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Thanks for the post OYGEN lots of great info!!!!
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Old 03-24-2009, 04:14 PM
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Awesome... if figured if lots of people see the internals maybe we can all come up with ideas.
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Old 03-24-2009, 05:12 PM
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Originally Posted by Oxygen View Post
Awesome... if figured if lots of people see the internals maybe we can all come up with ideas.
Chris:

Once again...great information!

Tom
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Old 03-24-2009, 05:16 PM
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Excellent post!

Should be a sticky!
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Old 03-24-2009, 05:25 PM
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Wow! That's very cool and informative info on the V12 nice post!
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Old 03-24-2009, 05:40 PM
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Hi Thanks for this lesson , almost gives me a headache trying to figure out
don't you anyone come and say it's only got 3 valves and 1 cam / head!!!!
$$$$OOOO nice and complicated.. Roger
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Old 03-25-2009, 12:57 PM
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Very cool post. Thanks!!
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Old 03-25-2009, 01:29 PM
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Your worst nightmare...
Very nice post chris. Very informative.
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Old 03-25-2009, 03:22 PM
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Wow where did you get this stuff?
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Old 04-10-2009, 12:02 AM
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Originally Posted by Oxygen View Post
These red 'plugs' look like knock sensors - do you have any information confirming this? I read somewhere that combustion ionization is used to optimize timing - I wonder whether the knock sensors are in fact still on our engines?

BTW - many thanks for these pics! awesome eyecandy!!
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Old 04-10-2009, 04:25 AM
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Excellent post Oxygen!! thank you for sharing....
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Old 04-10-2009, 06:38 AM
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Originally Posted by Thericker View Post
Excellent post Oxygen!! thank you for sharing....
+1
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Old 04-17-2009, 12:55 AM
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THANKS!
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Old 04-17-2009, 01:37 AM
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Originally Posted by CA_E55 View Post
These red 'plugs' look like knock sensors - do you have any information confirming this? I read somewhere that combustion ionization is used to optimize timing - I wonder whether the knock sensors are in fact still on our engines?
Those are in fact knock sensors, and they are used to help determine ignition timing to prevent preignition. The computer does use Ionic Current Detection for misfire diagnosis, but at full load at high rpms, the computer reverts back to the good old crank sensor for misfire diagnosis. If the crank slows down ever so slightly, it is determined to be a misfire. Also, the OP was slightly misinformed, as the alternator is liquid cooled on all biturbo cars, not just the Maybach. The turbos are liquid cooled, in addition to the oil feeds and returns also, making for some interesting plumbing on the engine. Also, the black plastic piece between the cylinder valley is a vacuum reservoir for the divertor valves and the wastegates, which are all computer controlled by solenoid valves directing the engine vacuum and boost from the manifold.

Nick
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Old 05-11-2009, 12:53 PM
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^ Awesome... thanks for the expert input!
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Old 05-11-2009, 01:04 PM
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Wow ... awesome pics. Thanks!!
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Old 05-11-2009, 06:10 PM
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Hello! Nice pics....I just posted some pics of the Internals of a current CL at the shop:https://mbworld.org/forums/cl-class-...gine-pics.html

NOT a TT though..
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Old 05-12-2009, 01:36 AM
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Originally Posted by nick 55 View Post
Those are in fact knock sensors, and they are used to help determine ignition timing to prevent preignition. The computer does use Ionic Current Detection for misfire diagnosis, but at full load at high rpms, the computer reverts back to the good old crank sensor for misfire diagnosis. If the crank slows down ever so slightly, it is determined to be a misfire. Also, the OP was slightly misinformed, as the alternator is liquid cooled on all biturbo cars, not just the Maybach. The turbos are liquid cooled, in addition to the oil feeds and returns also, making for some interesting plumbing on the engine. Also, the black plastic piece between the cylinder valley is a vacuum reservoir for the divertor valves and the wastegates, which are all computer controlled by solenoid valves directing the engine vacuum and boost from the manifold.

Nick
Thanks for your explanation, very interesting! (for some reason I only saw your reply today..)
BTW, do yo have any explanation why AMG went to a rear oil sump vs. the MB V12TT front sump? Cant be the chassis because they put the these engines in the same models.
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Old 05-14-2009, 05:50 PM
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Oil sumps are determined by the vehicle chassis the engine is installed in. The 220 and 215 are front sump, 230s are rear sump. Same with the 55kompressors, the 211 and 219 are rear sump, and the 220 and 215 are still front sump.

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