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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> drilled brake rotors - worthy upgrade? /cgi-bin/YaBB.pl?num=1359408770 Message started by strang on 01/28/13 at 13:32:50 |
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Title: drilled brake rotors - worthy upgrade? Post by strang on 01/28/13 at 13:32:50 First off I want to know if there are any savage years that had drilled rotors as stock? Also to anyone that's got them as stock or upgraded to them - was it really noticeable difference? bang for the buck? |
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Title: Re: drilled brake rotors - worthy upgrade? Post by Dave on 01/28/13 at 13:51:02 No Savage came with drilled rotors. I believe it is mostly for looks........Sport bikes and race bikes have it.....so I want one too. I just drilled mine - but I will not be riding it for a few months and can't give a performance report for a while. I also have made som many other changes......I probably won't be able to identify if the drilled rotor changed anything. |
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Title: Re: drilled brake rotors - worthy upgrade? Post by strang on 01/28/13 at 14:06:33 "No Savage came with drilled rotors." yeh I never saw them either but I'm a newbie so thought I'd check. This is what got me thinking: http://www.ebay.co.uk/itm/330840506316?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 usual ebay fibbs or custom job that ended up in the wreckers? |
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Title: Re: drilled brake rotors - worthy upgrade? Post by verslagen1 on 01/28/13 at 14:11:18 Might be a EBC disk which is a better quality disk. wreckers always assume what came off a bike is stock, but in this case didn't see specific wording as such. BTW: http://suzukisavage.com/cgi-bin/YaBB.pl?num=1327803868 |
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Title: Re: drilled brake rotors - worthy upgrade? Post by Gyrobob on 01/28/13 at 16:22:56 I don't know if it would help the Savage or not. One thing I do know is that the holes have to be small enough to increase the surface area to radiate heat. For example, if you drilled 1/2" diam holes, you would be reducing the surface area available to get rid of heat. The area of two 1/2" holes (what was there on each side of the rotor before you drilled the hole) would be more than the surface area of the ring around the inside of the hole. -- The area of a 1/2" circle is 3.14 x 0.25 x 0.25 ~ 0.2 sq in. Drill a hole that size and you remove two of those circles, one on each side of the rotor,.. so you lose ~0.4 sq in of heat radiating area. -- The area added by drilling the hole is the "hoop" around the inside of the hole,.. or the circular inside wall of the hole. Our rotor is ~ 0.18" thick. The surface area of that inside wall is 3.14 x .5 x 0.18 ~ 0.28 sq in, so the overall surface area for radiating heat is less. -- It appears the break even point for our rotor is around 0.36" diameter hole. -- Another issue is that when the holes are drilled, the mass of metal available to soak up heat is less as well,.. so the rotor will get hotter sooner. This would make me err on the side of smaller holes so as to leave more metal in the rotor. I'd probably go for a 1/4" diameter hole. Then again, I wouldn't drill the rotor in the first place. |
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Title: Re: drilled brake rotors - worthy upgrade? Post by Serowbot on 01/28/13 at 17:03:29 Total waste of time and money, no benefit whatsoever....... ...that said, mine are drilled... I like holes... ;D... |
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Title: Re: drilled brake rotors - worthy upgrade? Post by teabowl13 on 01/28/13 at 20:36:53 I had Verslagen drill my front rotor; 8 sets of holes, and let me tell you; this bike looks wicked fast with that thing mounted on there!! |
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Title: Re: drilled brake rotors - worthy upgrade? Post by Gyrobob on 01/29/13 at 04:33:32 360703000D150E5351620 wrote:
What size holes? |
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Title: Re: drilled brake rotors - worthy upgrade? Post by Dave on 01/29/13 at 05:30:37 One of the things that I heard the holes (and slots) can do is to allow the brake pads to outgas. When the disc is solid and you get on the brakes hard - the pads can emit gases (especially when they are new or are being used hard and have never been that hot before). The gases coming out from the pads are in contact with the solid rotor, and tend to push the pads away from the disc which make the brakes less effective when you need them most. The drilled holes (or slots) allow the gas to escape without pushing the pads away. I can see how this might work on a brand new set of pads that get too hot too soon (green fade) - but I am not sure it helps much on a set of pads that are broken in. I also believe the holes could make a bit more turbulance than a flat disc and cool down a bit faster when moving - but there is less mass to soak up the heat during heavy braking. I don't believe that the small holes will hurt anything......but I am not sure they will help much. |
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Title: Re: drilled brake rotors - worthy upgrade? Post by rat907 on 01/29/13 at 06:24:15 there's alot of good answers here, but to what effect is the value of drilled rotors besides the cool factor? From my truckdriver training, early love of automotive tech and science, I can do a tad more than speculate. Everything has a flash point even rocks. Two surfaces subjected to rubbing together cause friction. Friction produces heat and heat will accellerate wear and composition break down. Thats the basic science portion. On big rig trucks, their brakes are the weak link in the system. To stop the large masses forward momentum, the brakes apply resistance. Not only does this resistance cause heat, it degrades resistance quickly as expansion occurs. Not only that, but the braking material will liquify under hard braking just before the flash point is met. If flash point and liquified point are controlled before they happen, extreme heat is generated. A metalurgical occurance happens called Martinizing, which alters the metal and causes heat checks (very small cracks) and metal weakening to develop This is an extreme version for motorcycle brakes, but the principles apply, sport bikes came out with drilled rotors first for this very reason. Now for our little cruiser. For those in the big cities where stop and go traffic exists, heavy braking happens. Since the bike isn't rolling down the roads at a good clip, the rotors do not have the time to cool off fully (try grabbing your rotor bare handed after going across town). The stock rotors mass/thickness is increased for structural integrity to counter city driving and breaking heat build up. EBCs drilled rotors are thinner, lighter and they shed the heat faster in low speed usage than stock. Having your stock rotors drilled (correcttly) will aid in heat dissapation at low speeds (also reduce a little mass, lightening the rotor weight). The added benifit is water shedding between the pads and rotor (reduces hydroplaning of the pads on the rotor). This is seen on slotted and fluted brake rotors. You have to remember these bikes are the low line bikes now, designed for economy and city commuting where the occasional express way is encountered. They are made to be fast enough for city driving, but have to be upgraded in critical areas, such as brakes for use beyond this. Some of you may say BS, but hey, thats your take on it. |
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Title: Re: drilled brake rotors - worthy upgrade? Post by spacepirates on 01/29/13 at 06:28:52 Heat, water, gas.... In theory. Holes help dissipate heat, help get rid of water, and give a place for gasses/dust to go. I've been toying around with the idea of getting my rotor drilled to help with brake fade when it is wet out. Not really sure how much it would actually help, but sometimes it feels like I'm using slabs of butter rather than brake pads to stop in the rain. But really, with how most of us use our bikes, you won't notice any difference at all other than the looks, and the looks are all up to you. |
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Title: Re: drilled brake rotors - worthy upgrade? Post by prechermike on 01/29/13 at 06:55:56 7660776A72676A71050 wrote:
Bot nailed it, I think. MOST of what we do to our bikes is because we want to and we like it. At least that is what I tell my wife. |
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Title: Re: drilled brake rotors - worthy upgrade? Post by verslagen1 on 01/29/13 at 07:11:08 754B405D505D50320 wrote:
What size holes? [/quote] 4.78mm |
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Title: Re: drilled brake rotors - worthy upgrade? Post by verslagen1 on 01/29/13 at 07:14:02 Best answer, short, sweet, to the point. 3F3C2D2F293C253E2D38293F4C0 wrote:
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Title: Re: drilled brake rotors - worthy upgrade? Post by Super Thumper on 01/29/13 at 07:26:58 I searched around on the internet just before Christmas looking for NEW drilled brake rotors for my savage and found only ONE company making them for a Savage.....cost - $370.00 :o I will have Verslagen drill my rotors for me :) |
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Title: Re: drilled brake rotors - worthy upgrade? Post by rat907 on 01/29/13 at 09:02:42 5749404C424D514A4B250 wrote:
Got mine here: http://www.bikebandit.com/ebc-pro-lite-brake-rotor?m=147619 http://d136nqpz68vrmx.cloudfront.net/product_images/eb/120/ebc-pro-lite-brake-rotor.jpg |
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Title: Re: drilled brake rotors - worthy upgrade? Post by strang on 01/29/13 at 13:24:44 I would really like a bit better braking in the wet considering where I live and that I ride all year round to work, but the Savage consensus seems to be that it's mainly for looks. I like the look, I've just got other things to sort out before I get to that stage in priorities. |
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Title: Re: drilled brake rotors - worthy upgrade? Post by ralfyguy on 01/30/13 at 12:14:30 7E6D78353C3B0C0 wrote:
Got mine here: http://www.bikebandit.com/ebc-pro-lite-brake-rotor?m=147619 http://d136nqpz68vrmx.cloudfront.net/product_images/eb/120/ebc-pro-lite-brake-rotor.jpg[/quote] That says it's for the SV650. Does that fit on a Savage? |
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