Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-15-2016, 12:58 PM   #1 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 10,918

CM400E - '81 Honda CM400E
90 day: 58.68 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 60.65 mpg (US)
Thanks: 2,263
Thanked 2,346 Times in 1,420 Posts
Nissan announces 2.0L variable compression ratio engine



Hmm... very interesting.

The World's-First Variable Compression Ratio Engine Could Kill Diesel Forever

Quote:
The result of all this is an engine that gets 27 percent better fuel economy than Nissanís 3.5-liter V6, at roughly the same HP and torque. According to Reuters, at a press conference Nissan engineers said the new engine matches turbodiesels in torque, and is actually cheaper to build than modern turbodiesel engines.
What they fail to mention is this technology could also be used on diesels to further improve their efficiency as well (I would imagine at least). It would help deal with emissions as well as NHV and cold start conditions as well as efficiency... But you can't say that and also have a sensationalistic article title I suppose.

Attached Thumbnails
Click image for larger version

Name:	nissanvcr.jpg
Views:	644
Size:	44.8 KB
ID:	20381  
__________________
Current project: Adding regenerative braking to the Mirage
  Reply With Quote
The Following 4 Users Say Thank You to Daox For This Useful Post:
California98Civic (08-29-2016), Ecky (08-18-2016), mcrews (08-17-2016), sendler (08-17-2016)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-16-2016, 08:24 PM   #2 (permalink)
Master EcoModder
 
Join Date: May 2012
Location: Indiana
Posts: 1,519

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
Thanks: 164
Thanked 333 Times in 232 Posts
I thought hydraulically actuated valves were going to allow complete and independent control of effective compression ratio?

I think this is slick engineering, but I'm skeptical of it performing well in longevity tests.
__________________




  Reply With Quote
Old 08-17-2016, 04:44 PM   #3 (permalink)
home of the odd vehicles
 
rmay635703's Avatar
 
Join Date: Jun 2008
Location: Somewhere in WI
Posts: 3,075

Silver - '10 Chevy Cobalt XFE
Thanks: 291
Thanked 555 Times in 414 Posts
Nissan variable compression ratio tech - Insight Central: Honda Insight Forum

Hmm even on wired, see if this goes anywhere or if its like the 90's era Chrysler 2 cycle car.

Imagine trying to rebuild an engine with that thing in there though?
  Reply With Quote
Old 08-17-2016, 07:52 PM   #4 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,563

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,515
Thanked 3,332 Times in 2,102 Posts
I wonder if the performance gains are worth the cost and complexity penalties?

I don't see wide-spread adoption of this. I don't even see long-term Infinity adoption of it.

I think there are simpler ways to achieve similar goals.
__________________


  Reply With Quote
Old 08-18-2016, 02:36 PM   #5 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 10,918

CM400E - '81 Honda CM400E
90 day: 58.68 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 60.65 mpg (US)
Thanks: 2,263
Thanked 2,346 Times in 1,420 Posts
It would have been nice if they would have provided a apples to apples comparison of the mileage improvement. Yay, it makes as much power as a 3.5L. That is great. But, how does it compare fuel economy wise to a run of the mill 2.0L?
__________________
Current project: Adding regenerative braking to the Mirage
  Reply With Quote
Old 08-18-2016, 09:08 PM   #6 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,164
Thanks: 1,706
Thanked 578 Times in 395 Posts
Looking at it, it seems complex, but plot out the movement and it's pretty elegant.

First off, the power stroke is offset way to the side, and the conecting rod moves almost completely vertically, limiting side load and minimizing friction. Also, you have less horizontal movement at the bottom of the con rod than in a regular piston with the same stroke, and the counterbalance on the other side of the crank moves even less...

This all means less counterbalancing, less weight, smoother operation and... supposedly... the elimination of balancer shafts.

Sure, it's a little more complex... but with more parts under... presumably... less stress... it should all balance out.
  Reply With Quote
The Following User Says Thank You to niky For This Useful Post:
Daox (08-19-2016)
Old 08-22-2016, 09:15 PM   #7 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,588

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 2,958
Thanked 2,611 Times in 1,624 Posts
Here's another variable compression scheme:


(Click on image for link)
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
The Following User Says Thank You to NeilBlanchard For This Useful Post:
niky (08-23-2016)
Old 08-23-2016, 06:30 PM   #8 (permalink)
Not Doug
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 7,991

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 35.35 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 37.81 mpg (US)
Thanks: 5,094
Thanked 1,485 Times in 1,126 Posts
Could The World's First Variable Compression Ratio Engine Kill Diesel Forever?

Fixed

Frank, what do you think would be more effective?
  Reply With Quote
Old 08-23-2016, 08:53 PM   #9 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,521 Times in 1,122 Posts
The GM-version XM-1 tank had a variable compression ratio diesel engine (AVCR-1360), but ended up getting exactly the same "one-mile per gallon" mileage that the Chrysler XM-1 turbine did...so, the "peanut oil" burning turbine was selected (wink,wink).

Last edited by gone-ot; 08-23-2016 at 09:27 PM..
  Reply With Quote
Old 08-29-2016, 06:45 AM   #10 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,164
Thanks: 1,706
Thanked 578 Times in 395 Posts
Here's a little diagram I worked up last week:


  Reply With Quote
The Following 2 Users Say Thank You to niky For This Useful Post:
Daschicken (08-30-2016), t vago (08-29-2016)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com