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miko
PostPosted: Thu Feb 14, 2013 4:54 pm 
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So after a chat last night about 'variable valve timing' etc, I stumbled across this today....

http://www.mahle.com/C125718C005F8968/C ... N907STULEN

Any thoughts? first hand experiences?

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norton
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PostPosted: Thu Feb 14, 2013 5:16 pm 
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http://www.youtube.com/watch?v=0uiDmcPEekc
so simple why didn't I think of that :?:
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smac
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PostPosted: Thu Feb 14, 2013 6:38 pm 
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OK I watched that a couple of times.

I don't get it.

I mean I get the concept obviously. But I don't get the how.
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MrFail
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PostPosted: Thu Feb 14, 2013 6:55 pm 
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smac wrote:
OK I watched that a couple of times.

I don't get it.

I mean I get the concept obviously. But I don't get the how.


You must need some sort of electronic controller that hooks on the end . That controlls the cams turning independently . I think

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KLAS
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PostPosted: Thu Feb 14, 2013 7:52 pm 
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looks like a more modern version of the VVC Rover used

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drmini in aust
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PostPosted: Thu Feb 14, 2013 8:21 pm 
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Basically this design allows change in the LCA (lobe centreline angle) between inlet and exhaust valves whilst the engine is running.
As said in their marketing blurb this is impossible with a conventional single one piece camshaft like a Mini has.
It would need an external advance controller (or two, for V V T on both inlet and exhaust independently) of course.

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BALLISTIC
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PostPosted: Thu Feb 14, 2013 8:33 pm 
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From what i can tell from the design, it would need oil pressure to advance & retard the inlet & or exhaust cam lobes so it would need to run some sort of oil control solenoid, wheather it be operated via oil pressure (similar principal to an exciter diode in an alternator) or electronic means.

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Harley
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PostPosted: Thu Feb 14, 2013 9:45 pm 
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Clever idea but I can't see it working with much popularity.
Modern cars can have better and more modern control than that these days, until in ten years time when the cam may disappear altogether.
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smac
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PostPosted: Fri Feb 15, 2013 5:39 am 
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The bit I don't get is where they make a point of inserting pins, locking the two cams together.

It certainly is a stop-gap measure - extending the life of some older single cam engines. Can't see it as a long term innovation.
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drmini in aust
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PostPosted: Fri Feb 15, 2013 7:50 am 
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smac wrote:
The bit I don't get is where they make a point of inserting pins, locking the two cams together.

It certainly is a stop-gap measure - extending the life of some older single cam engines. Can't see it as a long term innovation.


The pins attach the cam lobes (which fit through the slots in the outer, tubular cam body) to the inner shaft.
Can't see any other way to do it, IMO it's probably the weakest part of the design.

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