285mm big brake conversion
Posted: Sat Feb 07, 2009 11:47 pm
Thought I would share this with you, have been working on this for some time now.
Is that mount Aluminium?
Looks great, nice touch with the sprint speed.
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285mm big brake conversion
Page 1 of 1
Re: 300mm big brake conversion
Posted: Sun Feb 08, 2009 1:24 am
Re: 285mm big brake conversion
Posted: Sun Feb 08, 2009 10:32 pm
Braking power is one, but continues braking power is two.
A big disk in a rather small 13" rim is practical total insulated from any cooling .
Simply leading cooling air trough a flex hose against the inner surface of the disk is not effective enough.
On our cars we measured significant temp differences up to 150' C between the inside and the outside part of the disk.
Did did course rapidity cracks in the disks, original AP disks used in F3.
So I made a air duct what all the cooling air forced trough the middle part, vanes, of the disk.
The temp difference between the outer and inner part disappeared, and also important the temp dropped about a 100'C and stayed under 550.
The braking power is extreme even with this rather wide tires, and stays the same over the whole racing distance, never pumping up the brakes before the next corner.
If someone also developing a system I would advise to use a radial type caliper with light springs behind the pistons what will help to keep the pedal travel as short as possible.
Next to that every stub axle bent during cornering and a big disk will push the brake pads more away than a small one.
Braking for the next corner can and up with a much longer pedal travel or worse.
Air duct to force the air to the inside of the vent disk.
11" disk into a 13" rim
Even these tires don't overrule the brakes.
Hans
A big disk in a rather small 13" rim is practical total insulated from any cooling .
Simply leading cooling air trough a flex hose against the inner surface of the disk is not effective enough.
On our cars we measured significant temp differences up to 150' C between the inside and the outside part of the disk.
Did did course rapidity cracks in the disks, original AP disks used in F3.
So I made a air duct what all the cooling air forced trough the middle part, vanes, of the disk.
The temp difference between the outer and inner part disappeared, and also important the temp dropped about a 100'C and stayed under 550.
The braking power is extreme even with this rather wide tires, and stays the same over the whole racing distance, never pumping up the brakes before the next corner.
If someone also developing a system I would advise to use a radial type caliper with light springs behind the pistons what will help to keep the pedal travel as short as possible.
Next to that every stub axle bent during cornering and a big disk will push the brake pads more away than a small one.
Braking for the next corner can and up with a much longer pedal travel or worse.
Air duct to force the air to the inside of the vent disk.
11" disk into a 13" rim
Even these tires don't overrule the brakes.
Hans
Re: 285mm big brake conversion
Posted: Sun Feb 08, 2009 10:37 pm
welterusten
Re: 285mm big brake conversion
Posted: Sun Feb 08, 2009 11:10 pm
Who said anything about fitting all that inside a 13" rim?
Really!
David
Really!
David
Re: 285mm big brake conversion
Posted: Mon Feb 09, 2009 10:18 pm
These are dutch Doctor Who rims. From the outside 13" but when you look inside they appear to be bigger.Sprint36 wrote:Who said anything about fitting all that inside a 13" rim?
Really!
David
