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General Category => General Discussion => Topic started by: chuck peterson on November 25, 2017, 05:14:37 AM

Title: Nissan variable compression gas engine reaching 40% thermal efficiency
Post by: chuck peterson on November 25, 2017, 05:14:37 AM

https://www.reuters.com/article/us-autoshow-la-nissan-infiniti/new-nissan-engine-bids-to-extend-life-for-internal-combustion-idUSKBN1DO1YL

A 2 liter pushing hp and torque like a 3.6.....

Title: Re: Nissan variable compression gas engine reaching 40% thermal efficiency
Post by: jas67 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.

Title: Re: Nissan variable compression gas engine reaching 40% thermal efficiency
Post by: ohiorider 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/

Title: Re: Nissan variable compression gas engine reaching 40% thermal efficiency
Post by: M0T0Geezer 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.

Title: Re: Nissan variable compression gas engine reaching 40% thermal efficiency
Post by: Idontwantapickle 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.