CNHSS1
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| posted on 13/10/10 at 10:34 AM |
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wilwood vs sierra rear caliper dimensions
current project has a wilwood disc conversion that was designed to take a drum sierra to wilwood cheap light ally sliding handbrake rear caliper.
if i change to sierra disc type rear hubs they have the caliper mounts 'built in' whereas current drum brake ones dont. Anyone know if the
sierra and wilwood mounting holes are same distance apart? ie a straight fit?
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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mcerd1
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| posted on 13/10/10 at 10:45 AM |
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do you mean this caliper ? linky
its a raidial mount so if you just bought the caliper on its own you could probably make brakets to suit the sierra discs and mounting lugs
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CNHSS1
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| posted on 13/10/10 at 10:57 AM |
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its this one which it seems they no longer do according to their site
im trying to cut down and simplify basically. Im looking at the ally versions of the sierra bearing carriers that the autograss boys make, and was
tring to avoid another adaptor plate as well
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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mcerd1
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| posted on 13/10/10 at 12:01 PM |
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...and you want to swap to the disc type hubs so you can use alloy hub carriers (if I'm understanding you right)
isn't there someone making alloy versions of the drum brake type ones ?
(I can measure up the std. ford rear disc bits for you - if you can wait till the weekend)
[Edited on 13/10/2010 by mcerd1]
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RazMan
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| posted on 13/10/10 at 12:15 PM |
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I'm not quite sure that I understand your question but ....
The Wilwood Powerlite calipers require an adaptor so they are not a straight swap.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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CNHSS1
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| posted on 13/10/10 at 12:54 PM |
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sorry, not making myself clear (all makes sense in my head  )
this is the type of rear bearing carrier i want to use.
they are an alloy copy of the sierra cast iron bearing carrier but without the lugs
if i continue to use my current wilwood ally rear calipers (not powerlite)
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i will need an adaptor bracket, caliper bolt holes are 90mm apart.
im trying to weigh up (no pun intended), whether i use the std sierra cast iron bearing housing with a direct fit lightweight caliper or whether to
use my current calipers with light bearing carriers but adaptor plates.
the PCD of a std ford bearing carrier would be really helpful, all 6 holes, 4 mounting holes plus two caliper mount holes.
any idea what a std ford item inc bearings weighs as that might make the decision?
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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TimC
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| posted on 13/10/10 at 01:21 PM |
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Your existing calipers look like VW ones.
If you want the lightest set-up possible, you might be just as well going to drums with the alloy bearing carriers.
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mcerd1
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| posted on 13/10/10 at 03:03 PM |
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quote:
Originally posted by TimC
Your existing calipers look like VW ones.
didn't rally design used to sell Golf ones (from a certain age) as lightweight direct replacments for the sierra ones
there are at least 2 kinds of bearing carrier with the lugs for the sierra - the cossie ones have longer lugs so the calipers can fit over 273mm discs
instead of the std. sierra/granada 253mm ones (and larger bearings too)
mine are the std. ones when I measure them and there are also 24v granada / 4x4 cossie ones that have big discs but the smaller driveshafts (and
bearings I think)
90mm ctr to ctr on the caliper mounting sounds righ to me (will check later)
(assuming thats your current setup in the pics) I don't know what discs you conversion kit is based on, but I think the sierra ones are biggger
have a much shallower bell in the middle - this can be a problem with small wheels I'm told (e.g. 13"
[Edited on 13/10/2010 by mcerd1]
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CNHSS1
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| posted on 13/10/10 at 03:11 PM |
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not into VW, but the wilwood supplied one looked very similar but not quite the same, possibly a far eastern copy?
i know that some of the VW versions were iron though, not all were ally.
two different sizes for differing discs sounds right.
Im pretty sure the RalDes conversion used 240mm solid discs, but cars not handy to measure.
if you could check the caliper mounting that would be usefu, cheers.
currently have plenty of clearance on 13" rims as they are spun ally split rims so have more clearance than a cast wheel, about the same as
14" cast ones i have. Dont really want to go to bigger discs, overkill and weight, and defo dont want vented as i need to keep the heat in on
hillclimbs not dissipate it! Heat allows the competition pads to not 'grab' when cold, they need a bit of heat to work nicely
cheers for the help so far Chaps 
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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mcerd1
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| posted on 13/10/10 at 03:27 PM |
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I'll weigh the std. discs - they are solid ones, only the cossie 4x4 / 24v's had vented ones
your discs are probably the front ones off a fiesta or something (I know some people sold kits that used them) - that big bell probably adds a bit of
weight though, the std.
I know it can be a total PITA getting this stuff worked out, if you wern't so far away I could just lend you the bits to try them.....
[Edited on 13/10/2010 by mcerd1]
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CNHSS1
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| posted on 13/10/10 at 03:33 PM |
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cheers for the help, thanks for the offer too, sure i can find a breakers locally that i can measure up myself if needs be.
The bell and discs are going to see the milling cutter to remove some material , all helps.
Their new home needs to be much lighter
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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CNHSS1
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| posted on 14/10/10 at 09:45 AM |
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had a scout round the workshop last night and found these ally brackets that came with the original RalDes sierra drum to disc convesrion kit
these, plus the autograss hubs should be nice and light and solve my problems, forgot id even got them 
any idea costs of sierra rear bearings to suit the bearing carriers?
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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