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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-23-2022, 09:25 AM   #21 (permalink)
Do more with less
 
Join Date: Jul 2010
Location: North Eastern Missouri
Posts: 930

OD - '05 Ford Econoline
90 day: 18.64 mpg (US)

Joetta - '86 Volkswagen Jetta Turbo Oil Burner
TEAM VW AUDI Group
90 day: 49.71 mpg (US)

Benzilla - '85 Mercedes Benz 300D
90 day: 28.08 mpg (US)
Thanks: 66
Thanked 177 Times in 112 Posts
The question seems to asking about mechanical efficiency of the transmission. perhaps confusing it with the overall economy

A lot of older transmissions would have the mainshaft run continuous from the clutch or torque converter to the output. Lower gears would use two sets of gears. Going to the secondary shaft and back to the primary shaft . Top gear is always 1:1, direct. The lower gears would have more losses as they would be transferring power to the secondary (lay) shaft and then back up to the main shaft

Most newer manual transmissions will have an input shaft and output shaft. So the transmission losses are similar across all the gears. Power is transferred across both shafts in all gears.

__________________
“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell

“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.

The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”

Noah Webster, 1787
  Reply With Quote
The Following 3 Users Say Thank You to Varn For This Useful Post:
Ecky (08-23-2022), Isaac Zachary (08-23-2022), serialk11r (08-23-2022)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-23-2022, 03:36 PM   #22 (permalink)
Master EcoModder
 
Join Date: Jan 2012
Location: United States
Posts: 1,756

spyder2 - '00 Toyota MR2 Spyder
Thanks: 104
Thanked 407 Times in 312 Posts
Varn you make a good point about the two sets of gears vs one. I was wondering what a ND Miata transmission looked like since Mazda bragged about the 1:1 6th gear being more efficient, and I noticed that there are a lot of transmissions out there that have 3 shafts, one pair which is inline and locked together for the 1:1 ratio. I had always thought transmissions came with just an input and output shaft.

I think in automotive applications however due to gear strength limitations there is a drop in efficiency from the gear ratios that deviate further from 1 as bigger gear pitch for strength = more sliding friction on the gears. I wouldn't be surprised if the typical 1st gear or some of the taller overdrives (like 0.6 ratio) were under 95% efficient.


Last edited by serialk11r; 08-23-2022 at 03:48 PM..
  Reply With Quote
Reply  Post New Thread


Thread Tools




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