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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-27-2019, 12:29 PM   #11 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 7,391
Thanks: 0
Thanked 762 Times in 673 Posts
Quote:
Originally Posted by roosterk0031 View Post
With ethanol's lower energy density than diesel, would that mean it has a much higher efficiency?
Not so sure about it having a much higher efficiency. Fuel consumption by volume is around 50% higher, but it's due to the lower energy density of ethanol. Considering that for spark-ignited engines the rule-of-thumb gives a 30% higher consumption by volume with ethanol, I'm inclined to believe there is no increase in thermal efficiency on compression-ignited ethanol engines compared to their Diesel counterparts.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-27-2019, 01:21 PM   #12 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 659
Thanks: 18
Thanked 140 Times in 124 Posts
I guess the advantage is using renewable fuel, probably engineered with no sulfur.
  Reply With Quote
Old 09-28-2019, 01:14 PM   #13 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 7,391
Thanks: 0
Thanked 762 Times in 673 Posts
Biodiesel is sulphur-free too. IIRC the main advantage of ethanol is a decrease on the emission of particulate matter due to its easier vaporising and nitrogen oxides due to its colder burn.
  Reply With Quote
Old 09-28-2019, 04:13 PM   #14 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 659
Thanks: 18
Thanked 140 Times in 124 Posts
Yes.
  Reply With Quote
Old 10-02-2019, 01:45 AM   #15 (permalink)
Master EcoModder
 
Join Date: Jun 2016
Location: WV
Posts: 1,098

IGL - '04 Saturn Ion
Team Saturn
90 day: 56.19 mpg (US)
Thanks: 46
Thanked 253 Times in 198 Posts
It does beg an interesting question though; why haven’t we added gas derived camshaft technology to Diesel engines? Variable timing/lift?
__________________
My current Ecotec project...


My last Ecotec project...
  Reply With Quote
Old 10-03-2019, 12:45 AM   #16 (permalink)
Master EcoModder
 
gumby79's Avatar
 
Join Date: Dec 2014
Location: Butte, Montana
Posts: 677

little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 2◊4 AUTO
Pickups
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 19.08 mpg (US)
Thanks: 198
Thanked 377 Times in 246 Posts
Quote:
Originally Posted by 19bonestock88 View Post
It does beg an interesting question though; why havenít we added gas derived camshaft technology to Diesel engines? Variable timing/lift?
Because in cars diesels are a luxury item 10-30K extra up front Plus diesel maintenance parts DPF,DEF ,EGR , SCR, and regens that move the $.01 per mi much closer to a gasser . Diesel is thrown in to improve Cafe scores and 3/4 + pickups aren't counted towards the cafe score. This is starting to change with the reintroduction of the diesel coming back to the cafe scored halfton and down trucks.

As I finished reading this thread , I was pondering a way to use oil pressure to change the index of the cam in relation to the gear (old gear drive on my Cummins). Twin cams would be the way to go.
__________________
1st gen cummins 91.5 dodge d250 ,HX35W/12
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 29.3mpg 97mi 3.311usg 7/27/16


Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


  Reply With Quote
Old 10-05-2019, 01:48 AM   #17 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 7,391
Thanks: 0
Thanked 762 Times in 673 Posts
Quote:
Originally Posted by 19bonestock88 View Post
It does beg an interesting question though; why havenít we added gas derived camshaft technology to Diesel engines? Variable timing/lift?
It's already fitted to some light-duty Diesel engines, even though they're not available in the U.S. and Canada.

  Reply With Quote
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