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Author Topic: Nissan variable compression gas engine reaching 40% thermal efficiency  (Read 1687 times)

Offline chuck peterson

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Nissan variable compression gas engine reaching 40% thermal efficiency
« on: November 25, 2017, 05:14:37 AM »
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Offline jas67

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Re: Nissan variable compression gas engine reaching 40% thermal efficiency
« Reply #1 on: November 25, 2017, 06:16:06 AM »
Wow, that's pretty cool!
Diesel fuel economy on gasoline.
I imagine a hybrid sedan or coupe with this engine could get 60-70 MPG.
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Offline ohiorider

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Re: Nissan variable compression gas engine reaching 40% thermal efficiency
« Reply #2 on: November 25, 2017, 08:20:44 AM »
Good going, Nissan!

Mazda isn't sitting back, either.  Here's their solution to a more efficient internal combustion engine. 

http://fortune.com/2017/10/24/mazda-internal-combustion-engine-fuel-efficiency/

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Offline M0T0Geezer

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Re: Nissan variable compression gas engine reaching 40% thermal efficiency
« Reply #3 on: November 26, 2017, 10:33:54 AM »
Interesting article.  But Inquiring Minds want to know exactly how Nissan varies the compression ratio. 

That sounds like a mechanical nightmare, on the order of providing dynamically variable valve lift.
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Offline Idontwantapickle

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Re: Nissan variable compression gas engine reaching 40% thermal efficiency
« Reply #4 on: November 26, 2017, 10:49:22 AM »
Rube Goldberg would be proud!

https://www.youtube.com/watch?v=kV2ApRM_Pi8

There are some other videos as well, it is an interesting solution.
« Last Edit: November 26, 2017, 10:57:09 AM by Idontwantapickle »
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