Go Back   EcoModder Forum > EcoModding > Success Stories
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-02-2018, 10:27 AM   #151 (permalink)
EcoModding Lurker
 
Join Date: Jul 2015
Location: Louisiana
Posts: 41
Thanks: 0
Thanked 14 Times in 13 Posts
The Jeep 4.0L straight six had both the exhaust and intake manifolds on the same side of the engine. Some models even had a problem or two from overheating the injectors due to exhaust manifold heat. The factory's fix for that was to insulate the affected injectors.

Although that old-school cast-iron six proved to be a great engine for pulling through the mud with all four tires spinning, alas it didn't do very well in regards to fuel economy. Pushing a square box through the air will do that.

The factory obviously didn't buy into the warm air intake being better for the Jeep. They located the air filter intake on the cool side of the engine. I guess heating up the intake air when you're doing three miles an hour in the muck might not always be seen as an advantage.

__________________
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-03-2018, 05:05 AM   #152 (permalink)
Master EcoModder
 
Join Date: Jan 2017
Location: Istanbul
Posts: 642
Thanks: 35
Thanked 65 Times in 52 Posts
I have an car now that i cannot do extensive modificatios to.

So i stuffed some cardboard in front of the radiator. And i removed the cold air intake so it should now suck warmer air from the engine bay.
  Reply With Quote
Old 02-04-2018, 11:02 PM   #153 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 6,541
Thanks: 0
Thanked 646 Times in 574 Posts
Quote:
Originally Posted by teoman View Post
I have an car now that i cannot do extensive modificatios to.
Why can't you do extensive mods to it?
  Reply With Quote
Old 02-05-2018, 01:21 AM   #154 (permalink)
Master EcoModder
 
Join Date: Jan 2017
Location: Istanbul
Posts: 642
Thanks: 35
Thanked 65 Times in 52 Posts
It's my grandmother's car. She doesn't use it much, but she will want it back eventually.
  Reply With Quote
Old 03-07-2018, 07:17 PM   #155 (permalink)
92 Civic VX since 2002
 
Magician's Avatar
 
Join Date: Dec 2016
Location: Bellevue, NE USA
Posts: 207

Green Bean - '92 Honda Civic VX
90 day: 58.68 mpg (US)

Wife's Prius - '08 Toyota Prius Base 315K miles

Silverbullet - '08 Toyota Prius
Thanks: 10
Thanked 26 Times in 24 Posts
This Winter season was brutal cold in Omaha... my MPG last tank was 46.32 MPG. It was nice having the new larger 13.5 gallon tank vs the old 10 gallon. This Summer will likely give me 900 mile tanks.
  Reply With Quote
Old 03-14-2018, 12:23 PM   #156 (permalink)
Master EcoModder
 
Join Date: Jan 2017
Location: Istanbul
Posts: 642
Thanks: 35
Thanked 65 Times in 52 Posts
What if the intake was modified to suck air through the radiator. Its relatively thermo regulated.
  Reply With Quote
Old 03-14-2018, 12:57 PM   #157 (permalink)
92 Civic VX since 2002
 
Magician's Avatar
 
Join Date: Dec 2016
Location: Bellevue, NE USA
Posts: 207

Green Bean - '92 Honda Civic VX
90 day: 58.68 mpg (US)

Wife's Prius - '08 Toyota Prius Base 315K miles

Silverbullet - '08 Toyota Prius
Thanks: 10
Thanked 26 Times in 24 Posts
You get warm/hot air much quicker off the exhaust manifold.
  Reply With Quote
Old 03-23-2018, 10:30 PM   #158 (permalink)
halos.com
 
Join Date: Oct 2009
Location: Oklahoma City, OK
Posts: 528

ECONORAM - '07 Dodge RAM 1500 QC SLT flex-fuel
90 day: 18.16 mpg (US)

the Avenger - '08 Dodge Avenger SXT
90 day: 27.06 mpg (US)
Thanks: 384
Thanked 92 Times in 78 Posts
Send a message via Yahoo to ECONORAM
Quote:
Originally Posted by teoman View Post
What if the intake was modified to suck air through the radiator. Its relatively thermo regulated.
I was doing that for a while until my electric fan gave up the ghost. On my truck it was worth a 30*F increase. I pulled air right from the upper radiator hose entrance.
__________________
  Reply With Quote
Old 03-25-2018, 05:10 PM   #159 (permalink)
Master EcoModder
 
Join Date: Jan 2017
Location: Istanbul
Posts: 642
Thanks: 35
Thanked 65 Times in 52 Posts
I am very much in to control systems, but i still have not figured out the optimal temperature parameters. Or the means to create a feedback loop (sensor information by which to control the temperature) for optimal fuel efficiency.

One thing that comes to mind (for steady speed) is increasing temp untill gas peadal is to the floor or advance decreases, or detonation begins or fuel injection time starts to increase (to cool things)... but unfortunately as of yet i am unable to conjure up the formula to create a system.

Academic papers are contradictory. Some say lower temps increase efficiency, some say they decrease it. In reality it is both, as intake temps decrease engine efficiency goes up, as butterfly valve opens up more, punping losses decrease, as intane air temp goes up vaporisation increases, hence more complete combustion...

One paper says 80 dec C is optimal, but that is for a HCCI engine.

So if you guys have any ideas, i would be willing to discuss yss.

Last edited by teoman; 03-25-2018 at 05:54 PM..
  Reply With Quote
Old 03-28-2018, 11:08 PM   #160 (permalink)
halos.com
 
Join Date: Oct 2009
Location: Oklahoma City, OK
Posts: 528

ECONORAM - '07 Dodge RAM 1500 QC SLT flex-fuel
90 day: 18.16 mpg (US)

the Avenger - '08 Dodge Avenger SXT
90 day: 27.06 mpg (US)
Thanks: 384
Thanked 92 Times in 78 Posts
Send a message via Yahoo to ECONORAM
Tvago did some testing with his dodge 4.7L, and found 130F was about the upper limit for improvement. I couldn't let mine get above 100F, or my engine's PCM would retard timing and that didn't help anything...

__________________
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com