big brake set up

X

xx YICK xx

Member +
pockrockgtti said:
You really do need that spigot ring or else the disc wont be centered correctly. I WOULD CONSIDER IT DANGEROUS IF YOU ARE DRIVING AROUND WITHOUT A SPACER!
Click to expand...

Checked that matey, The lateral movement is only 1mm if that due to the stud holes, You'd still only get that no matter how big the centre hole is, Once bolted up its going nowhere
 
Johnny_C

Johnny_C

Lifer
jayc-glanza17 said:
only going by someone else who did the st185 swap fella he advised so.
thought may as well add that in so peoplesort of have more info if you get me.

agree about fade due, my calipers OEM, were good, but since doing the celica twins, fade is a lot less,
dont forget guys, the brakes we upgraded to are designed to stop cars at least 300kgs heavier...

one thing to add, the st185 has more pads options but mintex do a set for the st165's jus ring them and they should help you out.
fensport sell redstuff pads, but these need tad bit of grinding as they are from an imprezza, which has similar sized twins...
Click to expand...

jay would you think the twin pots a better option over the big single?
 
P

pockrockgtti

Member +
xx YICK xx said:
Checked that matey, The lateral movement is only 1mm if that due to the stud holes, You'd still only get that no matter how big the centre hole is, Once bolted up its going nowhere
Click to expand...

Its a whole lot more than a 1mm matey! I cant belive you went to all the trouble to get the discs machined, and you couldnt be bothered to get a spacer made! Thats just poor engineering!
 
X

xx YICK xx

Member +
pockrockgtti said:
Its a whole lot more than a 1mm matey! I cant belive you went to all the trouble to get the discs machined, and you couldnt be bothered to get a spacer made! Thats just poor engineering!
Click to expand...

Trust me mate, I've been doing this 31 years, And the tolerences on this are alot closer than some manufacturers
 
P

pockrockgtti

Member +
xx YICK xx said:
Trust me mate, I've been doing this 31 years, And the tolerences on this are alot closer than some manufacturers
Click to expand...

With all due respect, you may have been doing, whatever you've been doing for 31 years, but that still doesn't change the fact that the discs isnt centered correctly! I test fitted mine without a spacer, because the disc was not centred perfectly at certain points of rotation the disc was actually coming in contact with the carrier!
 
X

xx YICK xx

Member +
pockrockgtti said:
With all due respect, you may have been doing, whatever you've been doing for 31 years, but that still doesn't change the fact that the discs isnt centered correctly! I test fitted mine without a spacer, because the disc was not centred perfectly at certain points of rotation the disc was actually coming in contact with the carrier!
Click to expand...

I've been in the garage business for the past 31 years, Thats what i've been doing. If you had you would know that every car has slight sideways movement in the disc, The reason your disc is coming into contact with the carrier is either, You aint had it machined down to 277mm or you got dodgy carriers, Theres a 4-5mm gap from disc to carrier on this
 
P

pockrockgtti

Member +
xx YICK xx said:
I've been in the garage business for the past 31 years, Thats what i've been doing. If you had you would know that every car has slight sideways movement in the disc, The reason your disc is coming into contact with the carrier is either, You aint had it machined down to 277mm or you got dodgy carriers, Theres a 4-5mm gap from disc to carrier on this
Click to expand...

That was when i test fiitted before i got the discs machined and before i got a spacer for the centerbore made. Mocked everything up, and when i rotated the wheel buy hand u could hear it catching ever so slightly.
 
sacodetoro

sacodetoro

Lifer
*runs and grabs some*
images
 
K

Keri-WMS

Member +
### Sticks neck out for health and safety reasons! ###

A disc MUST be positively located on the bore, if they are not concentric you run the risk of vibration, uneven surface temperatures, mechanical contact and even loostening bolts (due to flex and vibration).

To give the masses an idea, if the hub (male) part is 55.00mm, the hole in the disc should be 55.05mm>55.15mm for normal OEM specs. Anything over a 0.3mm gap (0.15mm radially) can be felt by hand as "sloppy" and over a 0.5mm gap (0.25mm radially) is getting risky.

pockrockgtti is 100% right, a 60mm disc bore on a 55mm hub is unsafe.
 
X

xx YICK xx

Member +
Keri-WMS said:
### Sticks neck out for health and safety reasons! ###

A disc MUST be positively located on the bore, if they are not concentric you run the risk of vibration, uneven surface temperatures, mechanical contact and even loostening bolts (due to flex and vibration).

To give the masses an idea, if the hub (male) part is 55.00mm, the hole in the disc should be 55.05mm>55.15mm for normal OEM specs. Anything over a 0.3mm gap (0.15mm radially) can be felt by hand as "sloppy" and over a 0.5mm gap (0.25mm radially) is getting risky.

pockrockgtti is 100% right, a 60mm disc bore on a 55mm hub is unsafe.
Click to expand...

How can you possibly run the risk of vibration, uneven surface temperature, and FLEX!!! when the disc and pads run in the same plane
Mechanical contact to what ?
 
K

Keri-WMS

Member +
xx YICK xx said:
How can you possibly run the risk of vibration, uneven surface temperature, and FLEX!!! when the disc and pads run in the same plane
Mechanical contact to what ?
Click to expand...

- Vibration: Due to the disc being off-centre, out therefore out of balance
- Uneven surface temperature: Due to the pads running up to then away from the edge of the O.D. of the disc resulting in hot / cold sections.
- Flex: If you have off-centre clamping loads on the mounting flange due to an off-centre disc you risk warping the disc allowing it to settle under side/cornering loads from the wheel. If the loads are not even on the wheel this compromises the bolt tightness in the same way as vibration.
- Mechanical contact: The caliper / carrier / heat shield etc.

All possible, and all reasons why car manufacturers don't put a 60mm disc loose over a 55mm hub.
 
J25GTi

J25GTi

Lifer
If the disc has room to move I.e. A 60mm bore on our 55mm starlet hub. Of course its going to move! There is 5mm of play in the disc! Chances are it will rotate in an off centre spheroid movement. Which could contact caliper or something.

You need some spigot rings making up!
 
J25GTi

J25GTi

Lifer
I lost the spigot ring for one of my alloys once on an old rover I had. And you could see and feel the vibration as it wasn't centred properly!
 
X

xx YICK xx

Member +
Right leave it there, Sorry to any members that started doing this just thought its a cheaper alternative to 4 pots for you.
 
J25GTi

J25GTi

Lifer
It would be, its only 25quid for spigot rings to be made up. So get some made up it will make sure the disc is centred on the hub and job done...
 
J

jayc-glanza17

Fresh Recruit
@ keri, havent seen ur 4 pot kits for sale on TD anymore???

and others a spigot ring is needed if u go down vauxhall disc route,
which is used for st185 calipers.

st165 route requires discs to be re drilled and fit a 3mm spacer between hub and disc.
some of u dont like redrilling discs, but it has to be done by a proper motorsport garage, not a back road garage.
since doing mine has no issues with them being re drilled.
 
You must log in or register to reply here.
Top