eBay FS: EVO VII 4 Pot Calipers

[WildCards]

Evo VII Calipers (http://cgi.ebay.co.uk/Brembo-6Pot-Brake-Calipers-For-Lancer-Evo-4-5-6-7-8_W0QQitemZ4607254781QQcategoryZ10400QQrdZ1QQcmdZV iewItem)

Thought these might be of use to someone.

[pezza]

Erm 6 pot ???? The look like standard 4 pot??? Maybe I need a slap in the face and new specs :D

[Nick Mann]

Erm 6 pot ???? The look like standard 4 pot??? Maybe I need a slap in the face and new specs :D

And me! /yes

[WildCards]

Erm 6 pot ???? The look like standard 4 pot??? Maybe I need a slap in the face and new specs :D

Amended

[Nick Mann]

Amended

Not your mistake - you were lead astray by the ill-informed owner of the calipers!

[WildCards]

Not your mistake - you were lead astray by the ill-informed owner of the calipers!

Cheers Nick - how can you tell beteen them? to save myself fom future blunders :embarasse

[Nick Mann]

Just count the pots! (?)

If you look at the shape of the caliper from the side, you will see a figure of eight type of shape - may be better described as an hourglass. The bulges are from the pistons - the casing shape tends to show the bulge. Two pistons on each side of the disc = four pot.

On a six pot you would expect three bulges on each side, and so on. I have seen ten pot calipers but I'm sure some sad git must have gone further!

[WildCards]

Just count the pots! (?)

If you look at the shape of the caliper from the side, you will see a figure of eight type of shape - may be better described as an hourglass. The bulges are from the pistons - the casing shape tends to show the bulge. Two pistons on each side of the disc = four pot.

On a six pot you would expect three bulges on each side, and so on. I have seen ten pot calipers but I'm sure some sad git must have gone further!

Theres me thinking it wouldn't ba that simple. Cheers Nick. What are the benefits of more pots? Decreased brake fade or greater braking force?

[Nick Mann]

Can't answer that one. I would imagine you will get more even clamping or be able to clamp a bigger area. Better braking must be a side effect otherwise why go for more pots?

I went for the four pot brembos as a cheap upgrade because I am lucky enough to have a facelift. But I think the biggest difference from the standard VR4 brakes is the size of the discs, not the number of pots on the calipers.

Maybe somebody good at technical sh!t can help?!

[psbarham]

Theres me thinking it wouldn't be that simple. Cheers Nick. What are the benefits of more pots? Decreased brake fade or greater braking force?
normally the main benefit is an increased area on the pistons meaning more leverage , the other benefit is to run narrower pad tracks (the bit the pad grips on the disc ) but still with the big surface area on the pad , all this means is less unsprung weight giving better handling

[psbarham]

heres a more technical version for you i wrote for derek when he was having a few problems




The master cylinder is the heart of the hydraulic system. It converts the force exerted on the brake pedal into hydraulic pressure that applies the brakes. Depressing the brake pedal moves a push rod in the master cylinder. Mounted on the push rod, are a pair of pistons (primary and secondary) in tandem (one after the other) that exert force against the fluid in the master cylinder bore. This creates pressure, which along with the fluid that's displaced by the pistons is routed through the brake lines to each of the wheel brakes.
Because brake fluid is incompressible, it acts like a liquid linkage between the master cylinder and each of the wheel brakes. Any increase in pressure that is created in the master cylinder is instantly transferred to each of the brakes. So as the pistons in the master cylinder push against the fluid, it displaces fluid through the brake lines. This pushes the disc brake caliper and wheel cylinder pistons outward to apply the brakes.
When the brake pedal is released, the spring-loaded piston assembly in the master cylinder returns to its rest position. The fluid that was displaced by the pistons is pushed back to the master cylinder as the disc brake pads kick out away from the rotors and springs inside the drums retract the brake shoes. The fluid returns to the fluid reservoir through the "compensating ports," which are small openings between the master cylinder bore and fluid reservoir just ahead of each of the pistons.
I hope that made sense to everybody, you! at the back, wake up it is about to get even more boring and less likely to make sense , judging from the description Derek has given me is down to the ratio between the master cyl and the calipers , the master cyl will only displace a set amount of fluid in one stroke for example 10cc now in his old calipers this was enough to push his pistons out by 10mm, enough to apply the brakes firmly without the pedal hitting the floor ( I know it isn’t 10mm in reality but it is an easier no. to work with ) now with his new calipers the surface area has increased by a considerable amount not only at the front, up from 2 pots to 4 pots , but also at the back ,up from 1 pot to 2 pots , this now means that the total surface area of the pistons has gone up and that the 10cc of fluid that was moving the pistons 10mm before is now only moving them 5mm , the only way to over come this is to find a master cyl with a bigger piston area so it displaces more fluid in one stroke preferably about 20 to 25 cc this will give you the 10mm of piston travel , I’m assuming that an evo 7 master cyl will fit the bill to match the calipers , this will hopefully restore his brakes .

[Brunty]

Don't know why you're all wasting money on these Brembo upgrades.

Drive slower, leave a large gap and use these (http://cgi.ebay.co.uk/BREMBO-High-Peformance-Disc-Brake-Cover-Perfect-Kit_W0QQitemZ8031801593QQcategoryZ23013QQrdZ1QQcmd ZViewItem)

[bernmc]

Don't know why you're all wasting money on these Brembo upgrades.

Drive slower, leave a large gap and use these (http://cgi.ebay.co.uk/BREMBO-High-Peformance-Disc-Brake-Cover-Perfect-Kit_W0QQitemZ8031801593QQcategoryZ23013QQrdZ1QQcmd ZViewItem) I used to have a nice pair of underpants with a big brown streak in them as well :sick: