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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-11-2017, 12:20 AM   #1 (permalink)
Ecomodding Crazy
 
Join Date: Aug 2011
Location: Bainbridge Island WA USA
Posts: 2

getto car - '95 volkswagon jetta 3
90 day: 33.68 mpg (US)

zach mobile - '96 Chevrolet s10 ls
90 day: 22.96 mpg (US)

walter smurf - '05 honda civic lx
90 day: 43.48 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
roots blower instead of butterfly valve

Let the intake vacuum do work on the roots blower.

My brother's car is 2L, 60mph is 2600 rpm.

That would be about 73 cfm at wide open throttle, actual engine intake is 17 inHg cruising.


my math is a bit fuzzy but it looks like maybe 2 hp theoretical is available.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-11-2017, 01:29 AM   #2 (permalink)
V8 guy
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 4,612

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)
Thanks: 98
Thanked 1,056 Times in 773 Posts
Yeah 4cyl gasoline engine cars typically lose about 2hp to isobaric losses.
Easiest way to fix that is get a diesel engine.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
  Reply With Quote
Old 01-11-2017, 01:46 AM   #3 (permalink)
Furry Furfag
 
Baltothewolf's Avatar
 
Join Date: Nov 2013
Location: Apple Valley
Posts: 1,958

Winsight - '00 Honda Insight
90 day: 60.75 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 28.7 mpg (US)
Thanks: 67
Thanked 338 Times in 265 Posts
Yes, you will probably gain efficiency with a roots blower anyway. On a 2L engine I recommend an SC12 from Toyota, it's clutched like an A/C compressor, so you can even toggle it on and off at will.
__________________

  Reply With Quote
Old 01-11-2017, 05:12 AM   #4 (permalink)
Eco-ventor
 
jakobnev's Avatar
 
Join Date: Oct 2010
Location: sweden
Posts: 1,071

Princess - '92 Mazda MX-3 GS
House of Tudor
Team Mazda
90 day: 52.59 mpg (US)
Thanks: 39
Thanked 297 Times in 198 Posts
Send a message via MSN to jakobnev
This has been invented many times.

My version first heated the air by extracting heat from the exhaust system, used a turbine to produce power, and finally cooled the air again before it went into the engine.
__________________




2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
  Reply With Quote
Old 01-11-2017, 05:20 AM   #5 (permalink)
Ecomuggler
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Mesa, AZ
Posts: 4,782

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 42.03 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 32.23 mpg (US)
Thanks: 2,710
Thanked 811 Times in 609 Posts
Will someone please explain... any single part of this? Thanks!
  Reply With Quote
Old 01-11-2017, 09:40 AM   #6 (permalink)
...beats walking...
 
Old Tele man's Avatar
 
Join Date: Jul 2009
Location: Tucson, AZ
Posts: 5,829
Thanks: 147
Thanked 1,313 Times in 979 Posts
It takes POWER to suck air through/past a partially open orifice (throttle).

__________________
2014 Toyota Prius 1.8L eCVT
2009 Pontiac Vibe 1.8L/SFI 4A
2004 Pontiac Vibe 1.8L/MFI 4A

2011 Chevrolet LTZ Cruze 1.4LT 6A
1971 Dodge Charger 318 3A
1970 Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula S 383 4M
1965 Plymouth Barracuda Formula S 273 4M
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com