lsdweb
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| posted on 25/10/05 at 02:31 PM |
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Rear discs versus drums - weights
I'm just completing my rear caliper conversion and thought I'd post the comparable weights of the drum versus disc setups.
Drums (per side)
Backplate and cylinder - 1700g
Drum - 3200g
Shoes and other bits - 900g
Total - 5.8Kg
Discs and calipers (per side)
Caliper and bolts - 2000g
Pads - 400g
Disc - 3400g
Caliper brackets - 200g
Total - 6.05kg
The new handbrake cables should be lighter as I'll be ditching the interconnecting steel rod so I'm hopng the weight difference will be
insignificant.
Regards
Wyn
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gutball
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| posted on 25/10/05 at 02:48 PM |
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Interesting!
Sierra right? Which drums do you have, 8 or 9 inch? There's only one type of Sierra rear disk isnt there (from "normal" models, i.e.
not XR,cossie etc)?
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wilkingj
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| posted on 25/10/05 at 04:20 PM |
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Not a lot in it is there  :
So little, that I would prefer to have the discs regardless of the difference. I would just loose a few Lbs to compensate.. ie a quick diet job!.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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MikeRJ
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| posted on 25/10/05 at 05:00 PM |
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quote:
Originally posted by wilkingj
Not a lot in it is there :
So little, that I would prefer to have the discs regardless of the difference. I would just loose a few Lbs to compensate.. ie a quick diet job!.
Why so keen on discs on the rear? They sure won't help you stop faster, just look better maybe.
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zetec
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| posted on 25/10/05 at 05:53 PM |
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If I did it again I would be tempted by drums. I might be wrong but I suspect you can fit 13" wheels which is not an option with discs. Also of
all the cars I have the handbrake is far better when working on a drum brake, iIsuspect because of the mechanical advantage the shoes give that you do
not get with pads.
Don't worry about them over heating as the standard fronts don't even get near there limits.
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highspeeddirt
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| posted on 25/10/05 at 06:41 PM |
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I used 8" drums because of the ease of seting up the handbrake and also I didn't think there was going to be any advantage on the road of
using discs. But the main thing has to be the relative cost of discs verses drums. With the money I saved at the back I've bought Hi spec ali 4
pots with lightweight discs and ali hubs for the front, where most of the braking is being done anyway. I have also saved weight over the standard
escort brakes/hubs.
Steve
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tks
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| posted on 25/10/05 at 07:50 PM |
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whats cheaper?
shoes or pads?
discs or drums?
handbrake is far better on disc as on drums! my handbrake equals the brake power on the rear!
The above comments are always meant to be from the above persons perspective.
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flak monkey
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| posted on 25/10/05 at 07:54 PM |
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Drums are cheaper. Calipers for the back end of a sierra are very expensive if you are fitting recon units.
Pads and shoes are the same price within a few pence
Drums themselves are £20 each and discs £13
Calipers are £55 each
Cylinders are £7 each.
Overall drums are cheaper. And as has been said before there is not a lot of point in fitting discs on the back sonce you then also have to fit a
regulator valve to stop the wheels locking too early as well.
The only reason I would end up with discs is if i fitted an LSD...
David
Sera
http://www.motosera.com
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lsdweb
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| posted on 25/10/05 at 07:59 PM |
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Live axle (English) rear end.
Costs - Peugot 206 - calipers - £45
pads - £12
Discs - Escort FWD (Incl machining) - £32
Brackets (CNC) - £50
Handbrake cables (206) - £21
Other bits / hoses - £20 approx
Fit very nicely under 13" wheels with loads of space to spare!
I wanted the more responsive braking offerred by discs / calipers without a major weight penalty - result!
Wyn
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liam.mccaffrey
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| posted on 25/10/05 at 08:57 PM |
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hows the throttle boddies coming wyn?
i was due in your neck of the woods tomorrow for a meeting but i've got some kind of infection/flu thing
Build Blog
Build Photo Album
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lsdweb
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| posted on 25/10/05 at 09:34 PM |
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Hi Liam
Still waiting for my manifold etc back from Altiss Engineering - it's been a while and I'm getting a bit nervous although he seems a
genuine guy!
I'm slowly getting the bits together - just waiting for a mate to make the swirl/collector pot and I can start plumbing and wiring it all in.
How are you getting on - any progress?
Feel free to call and see me, but not with any flu symptoms!
Regards
Wyn
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JoelP
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| posted on 25/10/05 at 09:44 PM |
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id use the 4 bolt hub carrier with a disc brake back end but no discs or calpiers, and use inboard brakes with an LSD  its quite easy to set up with
the bolt on shafts.
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NS Dev
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| posted on 25/10/05 at 09:55 PM |
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I'd rather have the few kg extra weight than p155 about with effing shite drums to be honest.
nothing wrong with the braking, they are just crap to work on, I hate the damn things!
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liam.mccaffrey
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| posted on 26/10/05 at 08:03 AM |
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going pretty well to be honest wyn, i decided not to buy a kit in the end and brave a scratch build. (despite your advice llys y fran last year). I
had collected so many bits whilst i was in uni it seemed silly to go and buy a kit.
I have set up my lathe as a tube notcher and i have a friendly tube bender near me. So i am hoping to do quite a high quality job. Only thing i am
having problems with is finding a reaonable CNC place for brackets and the like. You mentioned you used CNC for you brackets and it cost you £50
quid. How much do you get for £50. I'm a draughtsman so drawing parts is a nice distraction from work
Build Blog
Build Photo Album
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lsdweb
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| posted on 26/10/05 at 02:23 PM |
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Brave man Liam!
£50 got me the brackets from Trident Engineering (Sponsors of the Welsh Sprint & Hilclimb Championship and fellow competitors) but I could have
got them cheaper if I'd have understood a bit more about the process, as I could have drawn it all up using coordinates which would have saved
them redrawing it all!
I've posted some photos of the caliper conversion in my photo archive.
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RichieC
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| posted on 2/11/05 at 07:23 PM |
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Interesting stuff, I agree the only reason I see is fitting an LSD.
How much would be involved in fitting an LSD with drums at the back? Apart from rebulding the LSD into a different diff, can the shafts be
altered?
Rgds
Rich
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flak monkey
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| posted on 2/11/05 at 07:26 PM |
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quote:
Originally posted by RichieC
Interesting stuff, I agree the only reason I see is fitting an LSD.
How much would be involved in fitting an LSD with drums at the back? Apart from rebulding the LSD into a different diff, can the shafts be
altered?
Rgds
Rich
You could chop the shafts for the lsd and normal diff in half and weld them together using a sleeve. however that job is probably best left to a
profesional welder! Also I'm not sure if the shafts are the same diameter
David
Sera
http://www.motosera.com
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