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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-19-2009, 02:12 PM   #1 (permalink)
EcoModding Apprentice
 
Join Date: May 2009
Location: Western NC
Posts: 177
Thanks: 3
Thanked 43 Times in 19 Posts
Canceling out pumping losses of throttle governed engines

Tests have revealed that a vacuum on the crankcase is of negligible benefit of an otherwise stock engine.

At 7 in/hg of vacuum the seals were screaming bloody murder while drawing in air.

This thread can be considered null


Last edited by greasemonkee; 08-15-2009 at 05:03 AM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-19-2009, 02:16 PM   #2 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
They do this with vacuum pumps for race cars... yes, vacuum in the block is a good thing, and it actually provides more than "marginally greater" ring seals.

I'm not entirely sure how much vacuum they use, but you can get belt-driven vacuum pumps from Summit Racing and Jegs for the purpose.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 06-19-2009, 03:12 PM   #3 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2009
Location: French Louisiana
Posts: 123

Yaris - '07 Toyota Yaris Liftback
Thanks: 0
Thanked 0 Times in 0 Posts
It is illegal in the US.
  Reply With Quote
Old 06-19-2009, 03:13 PM   #4 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Source?
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 06-19-2009, 03:16 PM   #5 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2009
Location: French Louisiana
Posts: 123

Yaris - '07 Toyota Yaris Liftback
Thanks: 0
Thanked 0 Times in 0 Posts
www.supersixmotorsports.com/pdf/PCVBypass.pdf

What exactly is a catch can and how does it benefit? [Archive] - The Australian 300zx Owners Association
  Reply With Quote
Old 06-19-2009, 03:16 PM   #6 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2009
Location: French Louisiana
Posts: 123

Yaris - '07 Toyota Yaris Liftback
Thanks: 0
Thanked 0 Times in 0 Posts
Oops ignore Australian one lol
  Reply With Quote
Old 06-19-2009, 03:18 PM   #7 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Try again - that article had to do with bypassing the PCV system. What the OP is talking about involves using the OEM PCV system with a higher vacuum - i.e. still feeding the crankcase vent into the intake system to be properly recirculated and burned.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 06-19-2009, 03:21 PM   #8 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2009
Location: French Louisiana
Posts: 123

Yaris - '07 Toyota Yaris Liftback
Thanks: 0
Thanked 0 Times in 0 Posts
Ah ok. I thought he was bypassing it. My mistake.
  Reply With Quote
Old 06-19-2009, 03:50 PM   #9 (permalink)
Civic 4 Life
 
KJSatz's Avatar
 
Join Date: Jun 2008
Location: USA
Posts: 229

Civics Lesson - '08 Honda Civic LX
Team Honda
90 day: 40.53 mpg (US)
Thanks: 0
Thanked 2 Times in 1 Post
Honda's R18 has a system to help with that, right?
__________________
  Reply With Quote
Old 06-19-2009, 05:21 PM   #10 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,302

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 56.18 mpg (US)
Thanks: 580
Thanked 414 Times in 271 Posts
Pulse and glide solves the problem.

__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  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 02:49 AM
Throttle sensitivity Formula413 EcoModding Central 13 05-29-2008 05:55 PM
Misc pumping losses questions tasdrouille General Efficiency Discussion 11 03-27-2008 09:14 PM



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