Author Topic: resto/mod project CB400f from Italy (Read 57977 times)

Stev-o · « **Reply #200 on:** May 25, 2013, 07:40:32 PM »

Where ya going, Tuscany?!

Mugen_Stumpo · « **Reply #201 on:** May 26, 2013, 03:06:54 PM »

too bad the day after, the wheater was horrible... windy and strong rain the whole day... trip ruined

Mugen_Stumpo · « **Reply #202 on:** May 27, 2013, 05:11:39 AM »

some more drilling

Godffery · « **Reply #203 on:** May 27, 2013, 08:30:59 AM »

Keep in mind that you want to stagger the holes in a way that will pass by the entire surface of the brake pad.

Like these:
http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/album185/Brake+Rotors+_+Thinned+and+Drilled/HONDA+Front+brake+rotors+CB+350K-350F-360-400F/

If you do not, it will cause the pad to where unevenly then start digging groves in the rotor.

Viktor.J · « **Reply #204 on:** May 27, 2013, 08:42:35 AM »

Quote from: Godffery on May 27, 2013, 08:30:59 AM

Keep in mind that you want to stagger the holes in a way that will pass by the entire surface of the brake pad.

Like these:
http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/album185/Brake+Rotors+_+Thinned+and+Drilled/HONDA+Front+brake+rotors+CB+350K-350F-360-400F/

If you do not, it will cause the pad to where unevenly then start digging groves in the rotor.

What do you mean ? that the whole pattern should be fitted within the whole brake disc height ?

Godffery · « **Reply #205 on:** May 27, 2013, 10:04:29 AM »

No,
Think of the rotor being a straight bar; if there are any areas of the brake pad that do not cross over holes, it will not where the same as the area of pad that dose. You also want the pad to cross over about the same amount of holes per liner millimeter.

You can also think of the Brake pad as a comb; you want all of the teeth of the comb to cross over a hole and about the same amount of holes.

Viktor.J · « **Reply #206 on:** May 27, 2013, 10:09:25 AM »

Quote from: Godffery on May 27, 2013, 10:04:29 AM

No,
Think of the rotor being a straight bar; if there are any areas of the brake pad that do not cross over holes, it will not where the same as the area of pad that dose. You also want the pad to cross over about the same amount of holes per liner millimeter.

You can also think of the Brake pad as a comb; you want all of the teeth of the comb to cross over a hole and about the same amount of holes.

Many people have patterns not like this and I never heard about this problem. It sounds theoretically reasonable, but I'm not sure about how big practical impact it has. Would be fun to see

Godffery · « **Reply #207 on:** May 27, 2013, 10:15:20 AM »

Well it's not going to cause it to explode or anything but if the rotor heats unevenly, it will warp.

Viktor.J · « **Reply #208 on:** May 27, 2013, 10:23:36 AM »

Quote from: Godffery on May 27, 2013, 10:15:20 AM

Well it's not going to cause it to explode or anything but if the rotor heats unevenly, it will warp.

Due to the small distances and the convection rate in these kind of materials I doubt that even a racing use could cause uneaven thermal gradients big enough to warp the disc. I think if you manage to warp the disc it's because of the overall temperature that's (some how) very high, like machining, mayhem braking use etc.

Godffery · « **Reply #209 on:** May 27, 2013, 10:51:14 AM »

I'm just sharing information that I have learned threw research & first hand experience; do with it as you wish.

Viktor.J · « **Reply #210 on:** May 27, 2013, 11:03:47 AM »

Quote from: Godffery on May 27, 2013, 10:51:14 AM

I'm just sharing information that I have learned threw research & first hand experience; do with it as you wish.

And I'm thankful for that !
I just thinking that maybe there's another explanation to warped disc.
Many holes and (as in your example) a really thin disc can lead to high convection rates and bad heat exchange to the air cause the whole disc to get to hot and then warp.
But all input is good input !

Godffery · « **Reply #211 on:** May 27, 2013, 11:22:11 AM »

Heat and uneven where are the 2 most damaging effect on rotors.
(next to totally warn out pads of course)

Today's modern rotors are thinner & drilled or slotted because the industry has discovered threw the years that this will distribute & dissipate heat better. There is also the bonus of being much liter, reducing unsprung weight as well as gyroscopic effect.

Viktor.J · « **Reply #212 on:** May 27, 2013, 11:28:45 AM »

Quote from: Godffery on May 27, 2013, 11:22:11 AM

Heat and uneven where are the 2 most damaging effect on rotors.
(next to totally warn out pads of course)

Today's modern rotors are thinner & drilled or slotted because the industry has discovered threw the years that this will distribute & dissipate heat better. There is also the bonus of being much liter, reducing unsprung weight as well as gyroscopic effect.

That's true, and don't forget that our bikes have the first disc brake on a motorcycle. There has been quite a big improvement in materials over the last 40 years. Providing a disc capable of today's performance

Mugen_Stumpo · « **Reply #213 on:** June 06, 2013, 01:02:19 PM »

new koni shocks

Bankerdanny · « **Reply #214 on:** June 06, 2013, 01:25:26 PM »

Nice. I've got Koni's (actual Koni, not the modern Ikon) on my GL1000.

My basket case 550 came with Monroe's. Since I don't have a running bike yet I'm not sure how they will work.

Stev-o · « **Reply #215 on:** June 06, 2013, 06:20:00 PM »

Look good, how they feel? I need some for my 550...

Mugen_Stumpo · « **Reply #216 on:** June 06, 2013, 11:45:14 PM »

still have to ride with them... the're a bit softer then the marzocchi but surely looks better...

the cast aluminium body of the shocks is a work of art for 70's technology

Godffery · « **Reply #217 on:** June 07, 2013, 07:35:06 AM »

I would be interested in your old Marzocchi.
How much would need for them with shipping to the US?

Mugen_Stumpo · « **Reply #218 on:** June 07, 2013, 08:41:21 AM »

sorry... already gone for 150€ fully rebuilt

Godffery · « **Reply #219 on:** June 07, 2013, 02:21:35 PM »

Ok, thanks anyway.

Mugen_Stumpo · « **Reply #220 on:** June 08, 2013, 10:52:00 AM »

rode the bike today...

the koni's are amazing... a lot better than the marzocchi, i'm satisfied

Stev-o · « **Reply #221 on:** June 08, 2013, 01:05:45 PM »

Quote from: Mugen_Stumpo on June 08, 2013, 10:52:00 AM

rode the bike today...

the koni's are amazing... a lot better than the marzocchi, i'm satisfied

No pics of your bike out and about in your beautiful city?

Viktor.J · « **Reply #222 on:** June 08, 2013, 06:53:58 PM »

Quote from: Mugen_Stumpo on June 08, 2013, 10:52:00 AM

rode the bike today...

the koni's are amazing... a lot better than the marzocchi, i'm satisfied

They look great ! where did you buy them ? new ?

Mugen_Stumpo · « **Reply #223 on:** June 09, 2013, 11:01:33 AM »

unfortunatly no... i always leave the camera at home when i go out for a ride

Mugen_Stumpo · « **Reply #224 on:** July 01, 2013, 09:46:24 AM »

some new pics...

new fender and drilled rotor

News:

Author Topic: resto/mod project CB400f from Italy (Read 57977 times)