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#4709084 - 03/27/18 11:35 PM Nissan/Infiniti VC-Turbo Engine
MolaKule Offline


Registered: 06/05/02
Posts: 18945
Loc: Iowegia - USA
If this has been discussed before please ignore.

But Nissan/Infiniti will be introducing this new engine soon, a Turbo-Charged Variable-Compression ratio engine.

Interesting mechanical setup.

https://www.youtube.com/watch?v=9qkqp39eLc8
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#4709207 - 03/28/18 06:54 AM Re: Nissan/Infiniti VC-Turbo Engine [Re: MolaKule]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1297
Loc: Alberta
Very interesting. Thanks for sharing. They could have done a better job to explain how turbos work better with low compression but otherwise easy to understand. A few exrtra do-dads for your oil to care of.

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#4709317 - 03/28/18 08:44 AM Re: Nissan/Infiniti VC-Turbo Engine [Re: MolaKule]
CT8 Offline


Registered: 10/09/14
Posts: 10547
Loc: Idaho
That is a huge change in the auto engine design.
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#4709502 - 03/28/18 11:38 AM Re: Nissan/Infiniti VC-Turbo Engine [Re: MolaKule]
Dyusik Offline


Registered: 09/26/14
Posts: 1858
Loc: US-WA
Looks like more things that can potentially fail. Just give me a two stroke diesel and let me go home.
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#4709575 - 03/28/18 12:44 PM Re: Nissan/Infiniti VC-Turbo Engine [Re: MolaKule]
nthach Offline


Registered: 01/02/04
Posts: 3665
Loc: California
The turbo looks like it'll provide smoother boost - it looks like a blended dual-scroll design without having to resort to VGT(Honeywell) or VNT(Cummins/Holset), keeps in-house with IHI or Hitachi. Interesting linkage, it does remind me a little bit of Honda's VTEC, but also how ovalized chain rings are now being used on bikes.

I'm thinking Nissan looked at how Saab wanted to make a variable-displacement engine - but wanted to stick to a conventional block without a bellows. The VC mechanism fits in the same space in the crankcase as a balance shaft but given Nissan's proclivity for cost cutting...

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#4709714 - 03/28/18 02:47 PM Re: Nissan/Infiniti VC-Turbo Engine [Re: MolaKule]
JTK Offline


Registered: 08/14/03
Posts: 10417
Loc: Buffalo, NY
It does seem like a lot more components for the engine to fling around. More bearings and friction, but with the elimination of balance shafts it's perhaps not so bad. The turbo definitely adds additional complexity.
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