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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-03-2022, 02:28 PM   #1 (permalink)
Ecomodding Apprentice
 
Join Date: Dec 2018
Location: england
Posts: 308
Thanks: 43
Thanked 130 Times in 111 Posts
Reducing weight

Drilling brake disks/rotors or lathed for weight, has anybody done it themselves?

Also aluminum fuel tank, maybe to 4 gallon?

I understand if this thread is deleted for lack of substance..

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-03-2022, 02:33 PM   #2 (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
Drilling rotors takes a very miniscule amount of mass out of them. Lathing the hats might be substantial but I am guessing cast iron hats are crack prone if they are too thin which is why manufacturers prefer casting them thicker?

I personally would much rather have a larger fuel tank that is heavier. Stopping for fuel is not a good use of time.

Reducing weight to make your car faster makes sense but it doesn't really save a lot of fuel for the effort.
  Reply With Quote
Old 06-03-2022, 03:30 PM   #3 (permalink)
Ecomodding Apprentice
 
Join Date: Dec 2018
Location: england
Posts: 308
Thanks: 43
Thanked 130 Times in 111 Posts
A full tank lasts me 3-4 weeks so going down to 25 litres would still be very efficient timewise and even though E5 is relatively light. Thanks for the reply about the rotors. I also don't have a lathe or pillar drill...
  Reply With Quote
Old 06-03-2022, 04:34 PM   #4 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,740
Thanks: 8,158
Thanked 8,938 Times in 7,380 Posts


I may or may not've refilled on the side of the road with the motor idling. Rather than drilling the rotors I cryogenically tempered them to extend the service life.

__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
.
.
Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
Ecky (06-07-2022)
Old 06-03-2022, 08:56 PM   #5 (permalink)
Corporate imperialist
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 11,268

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)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 273
Thanked 3,571 Times in 2,835 Posts
You want carbon ceramic rotors.
__________________
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.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
The Following User Says Thank You to oil pan 4 For This Useful Post:
Nathan jones (06-04-2022)
Old 06-04-2022, 09:49 PM   #6 (permalink)
Ecomodding Apprentice
 
Join Date: Dec 2018
Location: england
Posts: 308
Thanks: 43
Thanked 130 Times in 111 Posts
Thanks yes, freezing cast is really backwards for a density reduction technique. Or at worst floating discs with rivets. For now I will skim down 25%, crossdrill then look at ceramics when I have more time 👍
  Reply With Quote
Old 06-04-2022, 11:59 PM   #7 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,740
Thanks: 8,158
Thanked 8,938 Times in 7,380 Posts
Are ceramic rotors generally available or is this thread about a specific application?

If it's backwards, you would find something to disagree with here:
Quote:
https://en.wikipedia.org › wiki › Cryogenic_hardening
Cryogenic hardening - Wikipedia
Cryogenic hardening is a cryogenic treatment process where the material is cooled to approximately −185 °C (−301 °F), usually using liquid nitrogen. It can have a profound effect on the mechanical properties of certain steels, provided their composition and prior heat treatment are such that they retain some austenite at room temperature.
Temper first and the machining should/will have less chatter.

I will have more data soon[-ish]. The car is at the shop and he will pull a rear drum and inspect it, The picture at Permalink #4 is from 2015.

The point with the gas cans is they can run full, empty or without, depending on circumstance. Usually, it's full in the right to balance the driver's weight.
__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
.
.
Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
  Reply With Quote
Old 06-05-2022, 01:31 PM   #8 (permalink)
EcoModding Lurker
 
Join Date: Aug 2013
Location: Arkansas
Posts: 57

LE Camry - '03 toyota camry LE
90 day: 30 mpg (US)
Thanks: 0
Thanked 24 Times in 15 Posts
Selecting the lightest tires and wheels possible would net far more benefits than anything with the brakes.

I have read that removing 1lb of rotational mass is like removing 3 lbs of regular mass in terms of acceleration and I'm sure mpg as well
__________________
Too much junk to list. From a 10mpg caddy limo to a 5 speed Saturn



  Reply With Quote
Old 06-05-2022, 02:13 PM   #9 (permalink)
Master EcoModder
 
Blacktree's Avatar
 
Join Date: Dec 2011
Location: Florida
Posts: 258

The Prius Experiment - '07 Toyota Prius Base
90 day: 58.52 mpg (US)
Thanks: 53
Thanked 167 Times in 110 Posts
I hate to be rude, but shaving the brake rotors for fuel economy sounds like a boondoggle.

There's a sticky thread at the top of the page, with a list of mods proven to improve fuel economy. That's a great place to start. Best of luck!
__________________
  Reply With Quote
The Following User Says Thank You to Blacktree For This Useful Post:
freebeard (06-05-2022)
Old 06-05-2022, 05:01 PM   #10 (permalink)
Corporate imperialist
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 11,268

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)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 273
Thanked 3,571 Times in 2,835 Posts
I just had rotors turned. New they are about 25mm, they are considered worn out at 24mm.

__________________
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.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Reply  Post New Thread






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