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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-18-2008, 03:31 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jul 2008
Location: tennessee
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
FreeWheeling

Is there a commercially available overrunning clutch I can put in my MR2? I am hypermiling and currently getting over 46 mpg with it just by coasting on hills. I could automatically do this if I had an overrunning clutch.

Saab used to have one in the old 99 but haven't heard of anyone else doing it.

Bill

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-18-2008, 03:38 PM   #2 (permalink)
Master EcoModder
 
Join Date: May 2008
Location: Auburn, NH
Posts: 451

Wicked Wanda - '99 VW Beetle GLS
90 day: 29.59 mpg (US)

Green Monster - '99 Ford Explorer Sport
90 day: 16.73 mpg (US)

Dad's Taxi - '99 Honda Odyssey EX
90 day: 24.23 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
By my understanding an "overrunning" clutch only grabs in one direction. You'd give up engine braking. You accomplish the same thing by pushing in the clutch.
__________________
  Reply With Quote
Old 07-18-2008, 04:00 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Jul 2008
Location: tennessee
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Yes, but since it is automatic, you may get better mileage with an overrunning clutch and you don't have the wear on the clutch plate from more frequent disengagement. I would think you could make an override into the clutch so you could engage/disengage engine braking.
  Reply With Quote
Old 07-19-2008, 12:18 PM   #4 (permalink)
EcoModding Apprentice
 
Join Date: Mar 2008
Location: Des Moines, IA
Posts: 155

Nerdcycle - '81 Honda CM400E
Motorcycle
90 day: 61.16 mpg (US)

Trouble - '06 Kawasaki Ninja
90 day: 74.69 mpg (US)

Edna - '13 Nissan LEAF SV
Last 3: 133.3 mpg (US)

Tank - '20 Ford Expedition Limited
Last 3: 17.4 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Maybe I'm missing something, but if the clutch only engages in one direction, how do you back up? This isn't a problem for motorcycles, but I don't think I'd want to put the thought into parking a car that could only go forwards.

__________________

  Reply With Quote
Reply  Post New Thread




Similar Threads
Thread Thread Starter Forum Replies Last Post
SAAB's (old) freewheeling manual transmission MetroMPG General Efficiency Discussion 1 01-23-2008 04:32 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com