Are replacement caliper pistons for OEM Brembo Evo 8/9 brakes available?
Apr 23, 2010, 05:59 PM
#31
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Getting away from the aluminum pistons should be the best way to help control the temp transfer and the properties of the actual piston when it is heated up. The "transfer" coatings (Swain and others) is an interesting option and seems to work very well. But for this idea, I think a different metal for the piston itself is a great starting point. Pete
http://www.youtube.com/watch?v=IUMMn...layer_embedded
After seeing this vid, I am now much more easily swayed to go this route.
Apr 24, 2010, 09:04 AM
#33
In terms of the video, how can the water be boiling in the S/S piston at an indicated temperature of 160-170 degrees?
Wouldn't the piston need to be closer to 212 degrees for it to boil - unless this test was done @ 10,000 feet of elevation or something?
Apr 24, 2010, 09:07 AM
#34
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Are you going to jump on a set of these Hsun? Might have to have a caliper rebuilding party.
Dave
Apr 24, 2010, 10:41 AM
#35
Sort of metallurgy 101 when you look at it. Alum transfers heat almost 6 times faster and more efficiently then steel. This is why 75% of the microchip heatsinks out there are made from aluminum. Same thing if you use an alum pan or a steel pan to cook Mac and Cheese with. In the video the heat from the burner transfers to the water in the Alum piston much faster naturally, and also transfers that same heat to the outside of the piston faster. The SS one of course takes longer to get the heat to the water, and even longer to let that heat get to the outside of the piston. So in theory, what their trying to do is keep the heat from the pad transferring to the raw fluid, or at least slow it down.
From a material/price standard, i'd disagree that it'd be 500 a set (per wheel??) If you look at the amount of metal in the DC Sports strut bar, or even CBRD's Ti lug nuts, you set those next to 8 piston's, the other devices will have more metal in them, and retail for around 300 dollars out the door, esp since these are a very basic shape and require no welding or threading.
For my money, and based on the facts, if it's 190 a wheel for this, your better off with Ti Shims as they will deflect many times more heat then SS pistons would, nevermind the weight. However....if this is our only option, and some people are having Alum durability issues, then by all means.
From a material/price standard, i'd disagree that it'd be 500 a set (per wheel??) If you look at the amount of metal in the DC Sports strut bar, or even CBRD's Ti lug nuts, you set those next to 8 piston's, the other devices will have more metal in them, and retail for around 300 dollars out the door, esp since these are a very basic shape and require no welding or threading.
For my money, and based on the facts, if it's 190 a wheel for this, your better off with Ti Shims as they will deflect many times more heat then SS pistons would, nevermind the weight. However....if this is our only option, and some people are having Alum durability issues, then by all means.
Apr 24, 2010, 01:03 PM
#37
Considering I've boiled Castrol SRF fluid with Girodisc Ti shims and two-piece vented rotors, and with brake cooling ducts aimed at my calipers, in about 5-7 hot laps at HPR (under 15 minutes of track time), AND my car will be over 100 whp/100 lb. ft. stronger when I return to the track in 2011, I believe the only braking solution for me lies in having substantially larger brake rotors.
Also, Balrok: A DC Sports ti strut tower brace is made of TUBING and PLATE. I think manufacturing ti brake pistons would require titanium BILLET, which I'm imagining has a completely different cost structure, not to mention the inherent high costs of machining titanium.
This webpage from 2003 -
http://www.tech.plym.ac.uk/sme/mech330/ticast.htm
- mentions a company in California who has the ability to make cast titanium parts - no idea if that'd be any cheaper or not.
Anyone actually have real-world experience working with titanium suppliers and manufacturing to give us a dose of reality?
Apr 26, 2010, 11:20 AM
#38
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Great video....You can see the SS piston transfers the heat at a much slower rate. I would love to know what a Ti piston would cost to make..hopefully less than the car cost ! Pete
Apr 26, 2010, 11:41 AM
#39
Depending on how bad the caliper is it may be better to get a replacement rebuilt caliper.
http://www.carpartsdiscount.com/auto...ml?3593=120300
http://www.carpartsdiscount.com/auto...ml?3593=120300
May 20, 2012, 11:04 AM
#45