New Norvil disc center thinner than old ????

I have a 13 inch Norvil disc and the center carrier is loose. So i ordered a new one and new pins but when carrier arrived it is 0.068" thinner than the disc (0.250") at the outer edge where disc is attached even though it is the same thickness (0.250") as the old carrier where it attaches to the wheel.

Does anyone have a new Norvil disc to tell me if the disc it's self is now made thinner. Or if they have had same issue when replacing a carrier.

I know there are other disc available for other makers please dont turn this into a you should have got this make or that type thread. Thanks.

Is this a Les Norvil or a Mick Hemmings Norvil, assuming its a Les then anything goes.

Kommando wrote;

Is this a Les Norvil or a Mick Hemmings Norvil,

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Mick Hemmings only sells the "original" sized Norvil discs which are 11.5", so I suspect as it's 13" that it has to be from "Norvil."

A friend of mine had a similar problem with his "Norvil disc (L. Emery sourced), where his disc started rattling away, but I can't remember what he did to sort it. I think it needed a new centre but can't be sure.

Hi

Got my Norvil front end cheap, as from new, the purchaser could not stand the rattling! Measured it all up & we changed the buttons, which were worn.
Sold it on. New owner brought new centres but it didn't improve it.

Chris

Its a Norvil (Les Emery) disc. It is the modern looking center not the original Norvil type solid center.
I also got it cheap as i suspect the O/P got fed up with it rattling.
I got it to uprate the brake by virtue of its larger than standard rota and also the reduction in weight was a bonus.

toppy said:

Its a Norvil (Les Emery) disc. It is the modern looking center not the original Norvil type solid center.
I also got it cheap as i suspect the O/P got fed up with it rattling.
I got it to uprate the brake by virtue of its larger than standard rota and also the reduction in weight was a bonus.

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Not much of a bonus if it is unusable

Not much of a bonus if it is unusable [/quote]


Seemed like a good idea at the time

I've just measured my clapped out "Norvil lightweight" disc and I get;

Where it fits onto the hub 0.252"
Width of carrier where it fits to the disc; 0.185"
Width of disc; 0.184"

Therefore 0.252 - 0.185 = 0.067" the same as you have measured.

I have had three of this type fail on me, two rears and one front. I have taken these measurements from the "loose on its pins" disc which now hangs on my garage wall as a reminder to me not to deal with that dealership anymore. They are, in my opinion, utter crap. I now run a (Mick Hemmings original type Norvil disc), and a standard rear which I have drilled a pattern into myself.

I can't remember the exact mileages, but my front did about 6k and my two rears did about 3k in total.

My advice would be fit it and start saving for when it wears out.

When I initially sent my first failure back to Norvil for inspection, it came back with a note in saying something to the effect of "New pins and clips fitted, these are standard service items on Ducati, Cost £40 :shock: :shock: :shock: and as it was the centre that was worn, the disc came loose in about 200 miles, and this is not included as one of the "3 new discs" as I subsequently got a completely brand new disc which lasted in effect no time.

Thans Reggie am going to ring Norvil Monday to ask them about it but am not expecting much joy. What is the size of your Hemmings disc and did it feel as if the size difference (if there was any) made a difference to the braking performance.

toppy wrote;

What is the size of your Hemmings disc and did it feel as if the size difference (if there was any) made a difference to the braking performance.

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Hemmings "Norvil" disc is 11.5" in diameter, my Les Em Norvil disc was 12" in diameter. So there was 1/2" difference, and I didn't notice any difference after swapping, although there was a Winter of not riding between using the L/Em disc and M/Hemmings disc. I have the master cylinder sleeved to 13mm, and the brake is what I would describe as ok, not great, but I ride two up a lot and have always been able to stop safely. I don't know if coming from 13" to 11..5" will be noticeable.

Do you use a standard disc fork slider with an adaptor plate or a "Norvil fork slider"? The reason I ask is because if you do use a Norvil fork slider, L/Em's Norvil fork sliders are designed to fit the 12" disc without adaptors and M/Hemm Norvil slider is designed to fit the 11.5" disc without adaptors, so L/Ems Norvil fork slider is incompatible with M/Hemms 11.5" disc.

I have standard slider and adapter plate. I also have sleeved down master cylinder an stainless steel brake hose. At the moment i have standard disc and caliper an though it works properly (all new parts an reverse bled on air in system) i have no real confidence in the stopping power (or lack of it). About 6 years ago i rode a old completely worn our Yamaha XJ600 in all weather's on my 40 mile commute to work. It had single (worn out) disc an caliper with 2 (rusty) pistons it also was around the same weight an travelled at similar speed but the braking performance as way better an never felt as though it was lacking given it was well past it unlike my Commando that is all new parts.
The plan was to get disc then an AP caliper later an fit it when had all the parts. Also that it would not look to modern more like a period modification.

I have the standard disc, a Lockheed (AP) caliper, sleeved master cylinder, stainless braided line & use EBC pads. It makes a very good brake. I had to use it in anger a few weeks ago & it surprised me at just how effective it was. It's easily as good as the twin Brembos on my BMW. Not 2 fingers like a Japanese twin disk setup but good nonetheless. The caliper is the weak link so in your position I'd be tempted to just get a new caliper & braided lines & see how you like it.

A friend of mine had one of Norvil's floating discs on his Mk3 & he too got sick of it rattling. He went back to standard disc & said braking wasn't much different.

Ian

I said:

the brake is what I would describe as ok, not great, but I ride two up a lot and have always been able to stop safely.

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Don't misunderstand me, it's quite safe, and I can lock it up when I give it a good squeeze. I've just bought a modern Guzzi with twin Brembos, the brakes on this are obviously better with more "feel" and "two finger" braking, so maybe I'm being a bit harsh and comparing with top quality modern brakes when I say "it's ok."

I haven't failed to stop yet :lol: :lol:

Nortoniggy said:

I have the standard disc, a Lockheed (AP) caliper, sleeved master cylinder, stainless braided line & use EBC pads. It makes a very good brake. I had to use it in anger a few weeks ago & it surprised me at just how effective it was. It's easily as good as the twin Brembos on my BMW. Not 2 fingers like a Japanese twin disk setup but good nonetheless. The caliper is the weak link so in your position I'd be tempted to just get a new caliper & braided lines & see how you like it.

A friend of mine had one of Norvil's floating discs on his Mk3 & he too got sick of it rattling. He went back to standard disc & said braking wasn't much different.

Ian

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I found when rebuilding the standard caliper that it will flex without much effort and i believe that it is now the weak link in the system. I to have EBC pads and the chrome was machined off the disc back in the 80s but i just don't feel like there is enough stopping power.
RGM list an AP caliper with larger pistons to maintain the hydraulic advantage of sleeved M/C my plan was to get one of those. Now i wonder if there is any point in using the Norvil disc or getting one from elsewhere.

I can't help much with your current predicament beyond recounting my experiences.
I upgraded the brake on my MkIIA to Lockheed racing caliper with adapter plate and 12" floating disc from RGM. With the re-sleeved master cylinder I've been very happy with the set up.
I'm used to modern uber-brakes, and this matches the bike well.
I haven't done a huge mileage, but the disc doesn't rattle and it runs true.

http://www.rgmnorton.co.uk/buy/upra...-floating-disc-lockheed-caliper-pads_2630.htm

My Combat ran a standard set-up (de-chromed disc) with the same re-sleeve job and braided hose and with Ferodo pads performed pretty much the same.

Spoke to Les Emery today and explained the problem it seems at some point Norvil have changed the thickness of the disc assembly and so my older type disc should not be used in conjunction with the new thinner type disc.

toppy wrote;

at some point Norvil have changed the thickness of the disc assembly and so my older type disc should not be used in conjunction with the new thinner type disc.

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Did he say why?

No Reggie Les did not explain why the size had changed an after another call today (not speaking to Les this time) i have arranged to return the center and get a refund.

I have in mean time been looking for other suitable replacement centers or complete disc assemblies an have noticed most modern day discs with a 5 hole mounting pattern (Harley) list 1/4" as rear and 5mm as front so a pure guess on my part would be changed form more readily available rotor size.