Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-22-2009, 02:02 PM   #11 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,943

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
Last 3: 51.27 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)
Thanks: 2,760
Thanked 5,637 Times in 2,904 Posts
Quote:
Originally Posted by MetroMPG View Post
  • The engine was durability tested to 1 million cycles.
That seemed low to me, so I did the math:

2500 RPM = 150,000 revolutions (cycles) per hour

= 6.6 hours of testing at that engine speed to get 1,000,000 cycles.

(... assuming 1 crankshaft revolution = 1 "cycle")

I trust Honda normally tests much more than 1 million cycles before things get into consumers' hands.

__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-22-2009, 09:34 PM   #12 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,417
Thanks: 173
Thanked 226 Times in 174 Posts
I would be surprised if "cycle" was 1 rev. I would hope that one "cycle" was one engine start-load- engine off-cool cycle.

-soD
  Reply With Quote
Old 04-23-2009, 09:55 AM   #13 (permalink)
EcoModding Lurker
 
Join Date: May 2008
Location: St. Louis
Posts: 28

silverciv - '01 Honda Civic EX 2dr
90 day: 36.13 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
I would bet that 1 cycle was probably switching from low to high and back to low.
__________________
  Reply With Quote
Old 04-23-2009, 01:02 PM   #14 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,516

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: 2,837
Thanked 2,552 Times in 1,586 Posts
Hi,

Are there any pictures or drawings of this? I'm a visual-type person...
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Old 04-23-2009, 01:17 PM   #15 (permalink)
Master EcoModder
 
Join Date: Nov 2008
Location: Cookeville, TN
Posts: 850
Thanks: 1
Thanked 5 Times in 5 Posts
Its one rotation of the crankshaft. One rpm=one cycle.

Its not being released to the public yet so no need to do 100 hr testing yet.

This was a scale test to determine whether or not the theoretical advantages would scale up and would be effective over time.

Now they'll run a system until they break it, since a 7.5% increase is pretty good.

On a related note its going to allow(coupled with V-TEC, GDI and stratified injection) a much greater spectrum of FE-HP. Higher compression(via adjustable heads) more aggressive valve timing and more fuel(via stratification) gives you more power while lower compression more aggressive valve timing and warmer charge(injecting little bits of fuel gradually to keep temps up as well as having less fuel evaporate overall) could yield substantial FE.
  Reply With Quote
Old 04-23-2009, 01:31 PM   #16 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 10,838

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: 45.07 mpg (US)
Thanks: 2,200
Thanked 2,304 Times in 1,394 Posts
Here is my interpretation of what they said. The inner piston is the bottom one, the outer is the top part in the picture (I made it transparent). The outer piston rides up and down on the center shaft area.

Attached Thumbnails
Click image for larger version

Name:	piston.JPG
Views:	66
Size:	15.8 KB
ID:	3298  
__________________
Current project: Help me kill my alternator - it is stubborn and won't die
  Reply With Quote
Old 04-23-2009, 07:18 PM   #17 (permalink)
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 257

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
Thanks: 0
Thanked 27 Times in 18 Posts
Quote:
Originally Posted by theunchosen View Post
Its one rotation of the crankshaft. One rpm=one cycle.
One complete 4-stroke engine cycle = TWO revolutions of the crankshaft

And I seriously doubt they are running at 1 rpm....
  Reply With Quote
Old 04-23-2009, 07:26 PM   #18 (permalink)
Master EcoModder
 
Join Date: Nov 2008
Location: Cookeville, TN
Posts: 850
Thanks: 1
Thanked 5 Times in 5 Posts
MM, lol sorry Deezler I should have specified. I mean that what they were counting were RPMs. Every time the crank shaft goes around your counter goes up one.

I doubt it too.. If you got that from me I'll be more careful in my phrasing in the future.
  Reply With Quote
Old 04-23-2009, 07:32 PM   #19 (permalink)
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 257

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
Thanks: 0
Thanked 27 Times in 18 Posts
No sorry I was just giving you a hard time, haha.

But if they were using engine cycles as their counter for test cycles, then it would still only count once for every two revolutions.

I am sure they durability test their engines for much more than 1 million engine cycles too. If it was idle to full load sweeps as "cycles" then 1 million would be an insanely high amount! Like, a few thousands hours or more...?
  Reply With Quote
Old 04-23-2009, 08:10 PM   #20 (permalink)
Renaissance Man
 
Formula413's Avatar
 
Join Date: Jan 2008
Location: In the Northeast dreaming of the Southwest
Posts: 594

Aegean Sea - '17 Honda Civic LX
90 day: 39.36 mpg (US)
Thanks: 18
Thanked 29 Times in 22 Posts
Interesting stuff. All it needs now is a camless valvetrain and we might be able to keep using this inefficient lump we call an internal combustion engine for a few more years.

__________________

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Honda IACV explained TomO Off-Topic Tech 16 12-21-2015 01:49 AM
Project: Rebuilding an '01 Honda Insight as a nonhybrid Fabio Hybrids 158 01-12-2013 11:59 AM
Someone asks: How did I get 40 mpg (US) from an '89 Honda Accord? MetroMPG Hypermiling / EcoDriver's Ed 0 04-09-2009 05:52 PM
Variable compression engine reduces fuel use 30%? SVOboy General Efficiency Discussion 6 01-02-2009 09:10 PM
Basic EcoDriving Techniques and Instrumentation SVOboy Instrumentation 2 11-17-2007 11:38 AM



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