standard s1 discs are 323mm front and 302mm rear

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Re: standard s1 discs are 323mm front and 302mm rear

Post by bigpete8 »

Humane-Hobgoblin wrote:
Sat Oct 20, 2018 1:33 pm
That’s.... not suppose to be like that...


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My first clue was when jacking from diff one wheel was well off the ground and other was still there....

My nuts rounded so had to split them. 😁
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Re: standard s1 discs are 323mm front and 302mm rear

Post by Humane-Hobgoblin »

Well that’s a bit of big giveaway! Sounds like a right ball ache!


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Re: standard s1 discs are 323mm front and 302mm rear

Post by bigpete8 »

Before I file the metal edge of my pads...
Should the be a really tight fit into the metal clips?

Cleaned clips and they are nice and bright but send too tight..
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Re: standard s1 discs are 323mm front and 302mm rear

Post by warpc0il »

Some brands of pads are made a bit tight and/or the paint is a bit thick.

However before you file the pads, make sure that there isn't a build-up of crud under the stainless clips, as this can also reduce the clearance.

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bigpete8 (Sun Oct 21, 2018 5:09 pm)
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Re: standard s1 discs are 323mm front and 302mm rear

Post by bigpete8 »

Filed and much happier.
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Re: standard s1 discs are 323mm front and 302mm rear

Post by bigpete8 »

DSC_1880.JPG
Rear discs were worse than Fronts..
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Re: standard s1 discs are 323mm front and 302mm rear

Post by warpc0il »

I'd be taking an angle grinder with a flap wheel to those discs, unless you're replacing them anyway
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Re: standard s1 discs are 323mm front and 302mm rear

Post by 13Black »

Quite a common thing on RX-8s for the rear discs' inside faces to be barely making contact.

Why, I don't know or really care, as it's not the end of the world to just fit new discs and be done with it. Just be sure that everything is working correctly and off you go.
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Re: standard s1 discs are 323mm front and 302mm rear

Post by bigpete8 »

Yes I now have new discs and pads all round.
Pagids on rear came with the protective paint mentioned above. Much easier than the eicher ones I ended up with on the front to clean.

My only remaining niggle is a squeal at very low speed light pressure breaking. Coming from Fronts.🤔
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Re: standard s1 discs are 323mm front and 302mm rear

Post by warpc0il »

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Re: standard s1 discs are 323mm front and 302mm rear

Post by bigpete8 »

IIRC I put this on the rear of the shims at the front - should it also go between the shim and the pads?
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Re: standard s1 discs are 323mm front and 302mm rear

Post by warpc0il »

I put it on the back of the pads and also on the locating tabs at the ends, and the sliding pins of the calipers and the thru pins that hold the pads.

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bigpete8 (Tue Oct 23, 2018 12:25 pm)
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Re: standard s1 discs are 323mm front and 302mm rear

Post by bigpete8 »

So finally got round to adding grease..
Squeal has gone thankfully!
😀

Rotated my tyres whilst I was on to even out the front to rear wear
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Re: standard s1 discs are 323mm front and 302mm rear

Post by R1DSO »

Dr. FrankenRex wrote:
Tue Oct 02, 2018 5:12 pm
*shrugs* BBQ paint them before fitting, simples.
warpc0il wrote:
Wed Oct 03, 2018 1:37 pm
Not all paint is created equal and I've managed to burn/blister "caliper paint" and "engine enamel" when applied to the discs and then taken for a track day - despite limiting the sessions to sub-15 minutes and doing a cool-down lap. :shock:

Exhaust manifold paint seems to be the only thing that stays on, also unlike the stuff that some aftermarket discs come painted with... [-X
Old thread resurrect…

I purchased a new set of Mintex discs and 1144 pads via Questmead, a suppler recommended on this forum. They even chucked in a club discount :D.

I’ve got myself a can of black Simoniz 800 degrees VHT spray paint to protect them from rusting. My question is, should I mask up the friction surfaces before painting, or can I let the pads scrape off any paint that they come in contact with.

Conflicting reports on the internet - some say the paint will contaminate the pads, others say it won’t. I’m keen not to ruin my brand new expensive 1144s. But, I suspect that painting the full rotor will give maximum protection against rust creeping in from the outer edges of the disc and reducing my friction area over time.

This rust creep has happened on the inside rear discs that are fitted to my R3 currently. I’ll be lubing up my calliper slider pins to ensure they’re working properly to cover off all bases!
Last edited by R1DSO on Sat Sep 04, 2021 10:46 pm, edited 2 times in total.
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Re: standard s1 discs are 323mm front and 302mm rear

Post by warpc0il »

Mask most of the friction area, letting the paint bleed in a few mm on the inside and outside edges, using the old discs as a guide.

This allows the pads to wear an exact edge, without worrying about contaminating the pad material.
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R1DSO (Sat Sep 04, 2021 10:46 pm)
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Re: standard s1 discs are 323mm front and 302mm rear

Post by R1DSO »

warpc0il wrote:
Sat Sep 04, 2021 10:29 pm
Mask most of the friction area, letting the paint bleed in a few mm on the inside and outside edges, using the old discs as a guide.

This allows the pads to wear an exact edge, without worrying about contaminating the pad material.
That sounds like a sensible compromise, thanks Dave. Will give that a shot tomorrow :thumleft:.

Once my old discs are off, I’m also planning on giving my hubs a good wire brush and clean, before spraying a couple of coats of VHT paint on them to prevent future rust build up.
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Re: standard s1 discs are 323mm front and 302mm rear

Post by warpc0il »

Don't apply any paint to the hub faces that the discs mount to, as this must be a clean metal-metal contact.
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R1DSO (Sat Sep 04, 2021 11:00 pm)
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Re: standard s1 discs are 323mm front and 302mm rear

Post by R1DSO »

warpc0il wrote:
Sat Sep 04, 2021 10:52 pm
Don't apply any paint to the hub faces that the discs mount to, as this must be a clean metal-metal contact.
Oh really?! Glad I mentioned that then :shock:. Minimally, I was going to paint the inside of rotor hub as I thought the rust could cause issues preventing the two surfaces from being completely flush.

I’ve seen vids of people applying copper grease to the hub which, as far as I’m aware, is a waste of time as this stuff bakes and loses its anti-seize properties with heat.
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Re: standard s1 discs are 323mm front and 302mm rear

Post by warpc0il »

No paint, no grease.
They shouldn't rust together if they're clean enough to create an air-tight seal.
You need metal-metal contact to ensure that the discs run true and also so the wheel studs are only needing to apply a clamping force and aren't under any shear load, as they would be if the surfaces could slide.

The same applies between the hub-disc and disc-wheel.
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R1DSO (Sun Sep 05, 2021 12:36 am)
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Re: standard s1 discs are 323mm front and 302mm rear

Post by R1DSO »

warpc0il wrote:
Sat Sep 04, 2021 11:10 pm
No paint, no grease.
They shouldn't rust together if they're clean enough to create an air-tight seal.
You need metal-metal contact to ensure that the discs run true and also so the wheel studs are only needing to apply a clamping force and aren't under any shear load, as they would be if the surfaces could slide.

The same applies between the hub-disc and disc-wheel.
Nice one, thanks for the guidance Dave. Much appreciated :thumleft:.

I’m hoping these new Mintex discs and pads will fix my track day hot brake judder issue I’ve posted about on a previous thread. Will follow-up on that track day thread once I’ve put the new gear properly through its paces [-o<.
2009 R3 in sparkling black
Racing Beat REVi ram air duct
K&N panel filter
Suffix C Mazda coils
Magnecor leads
Racing Beat header / mid pipe
RRP engine mounts
Hel braided brake lines
Carbotech XP10 pads / Mintex discs / Motul RBF600
Russell speed bleeders
Michelin Pilot Sport 4S tyres
R-Magic shift knob
Heel/toe pedal mod

1990 Eunos Roadster V-Spec in BRG