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1303 Posts Member #: 30 Post Whore Epsom, Surrey |
30th Jun, 2010 at 06:10:35am
back in the day the BMC works team used to drill half a dozen holes in the drums, just in the corner, next to the friction surface. this was done to remove dust and cool the drum. |
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520 Posts Member #: 2093 Post Whore Grenoble, France |
30th Jun, 2010 at 07:47:27am
I think to do so I'd need a lot of huge holes, which would weaken drums.
On 30th Jun, 2010 rubicon said:
maybe if you drilled them in at an angle so they self vent? std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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520 Posts Member #: 2093 Post Whore Grenoble, France |
30th Jun, 2010 at 07:50:55am
Why dust or water would no get to holes ?
On 30th Jun, 2010 1972-ANGUS said:
On 29th Jun, 2010 alpa said:
I still don't see how a few 20 4mm holes would weaken the drum. Well I'll see. Well i dont see how a few 20 4mm holes could streghten a drum(which go out of true all the time). Or improve a drum ( which may be adequate, if no dust getting in the holes, if no water getting in the holes) std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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520 Posts Member #: 2093 Post Whore Grenoble, France |
30th Jun, 2010 at 07:52:25am
You mean on the top of the drum ?
On 30th Jun, 2010 Turbo Shed said:
back in the day the BMC works team used to drill half a dozen holes in the drums, just in the corner, next to the friction surface. this was done to remove dust and cool the drum. std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
30th Jun, 2010 at 09:13:23am
Thinking about where the most likely place for maximum stress on a drum is, I see no problem drilling holes in it.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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 4890 Posts Member #: 1775 Post Whore Chester |
30th Jun, 2010 at 09:47:58am
My original minifins have two small holes in them but I cant see they work much they seem to clog very quickly... I have never found anything untoward in there as a result of the holes... I run a supercharger and I don't care the TB is on the wrong side.
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520 Posts Member #: 2093 Post Whore Grenoble, France |
30th Jun, 2010 at 09:53:04am
On 30th Jun, 2010 wil_h said:
Thinking about where the most likely place for maximum stress on a drum is, I see no problem drilling holes in it. Looking at other work Alpa has done he's not going to remove 50% of the material. A good skim on the inside would remove weight, and is an acceptable mod. Thanks wil_h I've checked the drum thickness and I would not remove any material, they are quite thin. And material is very soft which is probably good for hot/cold resistance but is not good mechanically. From the weight point of view the most of material is in the central plate, it's very thick. On the other hand it's the less inertially impacting part, so it's probably not worth of effort to weaken. Then the working area is thin, and then there is a collar which is here to seal and to make the drum stronger on the outside perimeter. Unfortunately the collar does not have fins. Here is the lost weight (having a lot of impact on the wheel's moment) and the lost opportunity to cool down. std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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520 Posts Member #: 2093 Post Whore Grenoble, France |
30th Jun, 2010 at 09:54:44am
On 30th Jun, 2010 gr4h4m said:
My original minifins have two small holes in them but I cant see they work much they seem to clog very quickly... I have never found anything untoward in there as a result of the holes... That's interesting. What's the size of holes ? I made 4mm holes and was planning to check whether they clog. If they clog this would mean they are too small. std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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4890 Posts Member #: 1775 Post Whore Chester |
30th Jun, 2010 at 11:33:09am
Alpa I'm not sure I will have a look next time the rear wheels are off. I run a supercharger and I don't care the TB is on the wrong side.
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1303 Posts Member #: 30 Post Whore Epsom, Surrey |
30th Jun, 2010 at 03:47:44pm
same as gr4h4m, i have original super minifins and they come with some holes in the corner between the friction face and the drive flange face, from memory there only about 2mm and they always clog. also from memory the works modification was more like 5mm holes |
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 695 Posts Member #: 984 Post Whore Westhoughton, Bolton |
30th Jun, 2010 at 04:15:42pm
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520 Posts Member #: 2093 Post Whore Grenoble, France |
1st Jul, 2010 at 07:15:48am
Thanks guys, this helps. I'll keep 4mm holes then and check after 300 miles if they are clogged. std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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 1137 Posts Member #: 1450 Post Whore Near Paris - France |
1st Jul, 2010 at 09:58:24pm
I hope it was not me that pissed you off !
Rusty by nature
On 23rd Jun, 2008 paul wiginton said:
They said "That sounds rough mate." I said "Cheers it cost me a fortune to make it sound like that!" |
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520 Posts Member #: 2093 Post Whore Grenoble, France |
1st Jul, 2010 at 10:38:10pm
I would not drill if I did not know that nascar guys were doing that tens of years ago.
Edited by alpa on 1st Jul, 2010. std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
1st Jul, 2010 at 10:49:21pm
When I was building my clubby I considered removing the fins off my super fins, as given the set-up of the car and my driving style I couldn't see the rear brakes doing enough work to get hot enough to need cooling fins. Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer |
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
2nd Jul, 2010 at 09:05:01am
On 30th Jun, 2010 gr4h4m said:
My original minifins have two small holes in them but I cant see they work much they seem to clog very quickly... I have never found anything untoward in there as a result of the holes... I always thought that these were for pressing out the steel linings if changing them. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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520 Posts Member #: 2093 Post Whore Grenoble, France |
2nd Jul, 2010 at 11:21:14am
On 1st Jul, 2010 Rob H said:
When I was building my clubby I considered removing the fins off my super fins, as given the set-up of the car and my driving style I couldn't see the rear brakes doing enough work to get hot enough to need cooling fins. I'm quite sure on track it would hurt. I've modified the brake pressure distributor to have more pressure on rear (as I've got Fiesta calipers on the front), rear rims get hot after several violent stops. I've never had pedal fading but I've never been on the track. I would not appreciate to get it there for the first time. std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm |
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