Reducing unsprung weight by moving discs inside?

"BaconSandwich is tasty." (baconsandwich) 05/27/2015 at 19:54 • Filed to: None

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I’ve seen a number of people taking about unsprung weight on vehicles, and how more weight is a bad thing.

!!!error: Indecipherable SUB-paragraph formatting!!!

I remember seeing something a while back, where the disc brakes were moved in-board, and mounted right next to the differential, inside the car. Is there a reason, perhaps other than packaging, why more sports cars don’t do this?

EDIT: Never mind - answered my own question. Wikipedia to the rescue. I figured I might as well post this in case anyone else is curious.

http://en.wikipedia.org/wiki/Inboard_b…

JR1 > BaconSandwich is tasty. 05/27/2015 at 20:02

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Weight? I laugh in the face of weight.

My 5000lbs life. A new TLC spin off

PS9 > BaconSandwich is tasty. 05/27/2015 at 20:08

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Nope, don’t want that. A brake pad job already sucks balls, I don’t wanna add hoisting up the whole rear end of the car and crawling beneath it to the list.

Toyota Sucks Lots Of Sausages > BaconSandwich is tasty. 05/27/2015 at 20:08

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I’d say packaging and ease of maintenance would be 2 of quite a few reasons why we don’t see inboard brakes in modern production cars. The heat from the engine and transmission and differential might affect the performance of the inboard brakes and vice-versa. Naturally the room within the wheel is better used for brake assembly placement and cooling.

BaconSandwich is tasty. > JR1 05/27/2015 at 20:15

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I bet a car that big is big enough to live in...

BaconSandwich is tasty. > Toyota Sucks Lots Of Sausages 05/27/2015 at 20:16

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I think it’s one of those things that we’ve slowly figured out the ideal way of doing it, and that ends up being putting the discs inside the wheel, rather than inside the body of the car.

BaconSandwich is tasty. > PS9 05/27/2015 at 20:17

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That certainly wouldn’t stop someone like Audi from doing it...

Steps to swap brake pads:
1. Remove front end of car.
2. ...

McMike > BaconSandwich is tasty. 05/27/2015 at 20:18

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I have inboard rear disks on one of my cars.

Wish I didn’t. Bleeding them is a PITA. Replacing pads is a PITA. Replacing rotors consists of this.

Toyota Sucks Lots Of Sausages > BaconSandwich is tasty. 05/27/2015 at 20:22

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Exactly. I don’t think there’s a more optimal way of placing the brake assemblies in a car, with all things considered.

On the plus side, the rotors are somewhat a visual nicety when paired with good looking wheels and tires.

PS9 > BaconSandwich is tasty. 05/27/2015 at 20:26

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2. Leave it at the repair bay and buy a car from people who AREN’T INSANE

JR1 > BaconSandwich is tasty. 05/27/2015 at 20:36

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Likely bigger than some NYC apartments

BaconSandwich is tasty. > JR1 05/27/2015 at 21:39

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And probably less expensive...

BaconSandwich is tasty. > PS9 05/27/2015 at 21:40

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There’s an A4 wagon down the street from me that’s for sale. Gorgeous looking car, but I think the first thing I’d want to do with it is a small block Chevy transplant.

BaconSandwich is tasty. > Toyota Sucks Lots Of Sausages 05/27/2015 at 21:41

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From what I understand, things like carbon-ceramic discs do weigh considerably less than their regular steel counterparts. Combine that with aluminum rims, and it should really help drop some of that unsprung weight.

BaconSandwich is tasty. > McMike 05/27/2015 at 21:41

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E-type?

samssun > BaconSandwich is tasty. 05/27/2015 at 21:45

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Monster trucks save unpsrung weight

McMike > BaconSandwich is tasty. 05/27/2015 at 21:51

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Yes.

BaconSandwich is tasty. > McMike 05/27/2015 at 21:56

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McMike > BaconSandwich is tasty. 05/27/2015 at 22:01

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I love that guy’s page.

http://www.brit.ca/~tboicey/comic…

Edit - Wow, most of that stuff is 14 years old.

BaconSandwich is tasty. > McMike 05/27/2015 at 22:26

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Time flies when you’re having fun. Or busy fixing busted stuff.