cloudy
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| posted on 2/8/06 at 04:03 PM |
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Redrilling stud pattern on sierra + cortina hubs
I've just bought some alloys (sold as 4x108, but in fact 4x115) I got them for a great price and the styling is just what i'm after.
How complex an operation is redrilling the studs? I am having some new center spigots lathed up so its perfectly concentric - I take it therefore the
studs dont have to be pin accurate, as they are much smaller than the alloy holes anyway.
Any input would be much appreciated...
Ooh a pic of how they look with the extra frame photoshopped on...
www.warnercars.com
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nick205
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| posted on 2/8/06 at 04:57 PM |
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I would have thought you could drill the required holes at 45 deg intervals to the existing holes without any strength issues - providing there is
enough material left between the hole and the outer edge of the flange. Also as you point out, its the centre spigot that provides the accurate
location rather then the studs themselves.
Nick
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cloudy
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| posted on 2/8/06 at 05:23 PM |
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what I forgot about is the two holes in the sierra flange to allow you to get to the mount bolts, it will leave little material left to miss them  ,
i'd better get the right alloys
James
www.warnercars.com
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richardR1
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| posted on 2/8/06 at 05:28 PM |
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A number of wheel manufacturers do dual fitment wheels with 2 sets of PCD, i.e 8 or 10 holes so should be OK to drill 4 new holes at 108 between the
114.3 holes you have already. Don't know where you are but near me there is Ian Jemison Engineering in Bishopthorpe near York who does this.
[Edited on 2/8/06 by richardR1]
MK Owners Club Member 1015
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Hammerhead
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| posted on 2/8/06 at 05:47 PM |
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or you could use hub adapters.
I had some specially made for my MK. The wheels I wanted to fit were off a Lotus 340r (magnesium) and to make them fit the sierra hubs I had machined
4 up. This also gives the wheels the right offset and enough room for my 300mm hi-spec front disks.
 
Rescued attachment hub-adaptor-kit_LRG.jpg
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cloudy
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| posted on 2/8/06 at 10:36 PM |
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they look rather expensive, what did they cost?
James
www.warnercars.com
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NS Dev
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| posted on 2/8/06 at 10:46 PM |
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If the predicted spec bit at the bottom of your posts is what you are aiming for then you'll need mag wheels, if you can get it built and road
legal and weighing no more than 300kg I'll personally give you a tenner!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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cloudy
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| posted on 2/8/06 at 11:08 PM |
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Don't see why not - i'm still under 200kg chassis + engine - can't imagine wheels and steering weighing 100kg's!
remember I have no heavy diff casing + crown, prop shaft, lightened discs, ally hubs and no bodywork
James
[Edited on 2/8/06 by cloudy]
[Edited on 2/8/06 by cloudy]
[Edited on 2/8/06 by cloudy]
[Edited on 2/8/06 by cloudy]
www.warnercars.com
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gazza285
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| posted on 2/8/06 at 11:21 PM |
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Wheels at tyres come it at around 13 to 15kg. Four of is 50 to 60 kg. Shockers are around 5kg each, gives you a total of 20kg. Uprights and wishbones,
even with lightened discs and alloy hubs will be at least 10 kg a corner, so another 40kg minimum. Thats another 120kg without adding a rack, trackrod
ends, steering column, battery, drive shaft or shafts, seat, harness, wiring, pedal box, radiator (and water to fill it) and the floor etc etc. Good
luck.
DO NOT PUT ON KNOB OR BOLLOCKS!
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MikeRJ
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| posted on 2/8/06 at 11:22 PM |
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I reckon 4 aluminium alloy wheels and tyres will eat a very big chunk of that 100kg budget!
Back on topic, somewhere I have seen alloy Cortina hubs that were available undrilled, but I can't remember where! Perhaps this will jog
someone elses memory.
[Edited on 2/8/06 by MikeRJ]
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cloudy
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| posted on 2/8/06 at 11:26 PM |
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We'll see - I reckon i'll hit 350 for certain, and 300 an entertaining challenge
Who else is putting down a tenner?
gonna need it for all the carbon fibre 
James
www.warnercars.com
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gazza285
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| posted on 2/8/06 at 11:38 PM |
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£10 you don't make 300kg.
DO NOT PUT ON KNOB OR BOLLOCKS!
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gazza285
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| posted on 2/8/06 at 11:39 PM |
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quote:
Originally posted by MikeRJ
Back on topic, somewhere I have seen alloy Cortina hubs that were available undrilled, but I can't remember where! Perhaps this will jog
someone elses memory.
[Edited on 2/8/06 by MikeRJ]
Deckman will do them undrilled, or different PCD I'm sure.
DO NOT PUT ON KNOB OR BOLLOCKS!
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Hammerhead
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| posted on 3/8/06 at 07:23 AM |
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think the hub adaptors are about £70.
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Syd Bridge
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| posted on 3/8/06 at 10:06 AM |
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quote:
Originally posted by cloudy
gonna need it for all the carbon fibre
James
You'll be needing my services most definitely, then.  Well, that's if you are going to have any chance of getting anywhere close to
350kgs. My experience would say nearer 450, but, that depends how much you value safety and your life.
That chassis needs a few more triangles, and a heavier top rollover section.
See left and up a little. 
Cheers,
Syd.
[Edited on 3/8/06 by Syd Bridge]
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DIY Si
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| posted on 3/8/06 at 10:10 AM |
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quote:
That chassis needs a few more triangles
Could be he's planning on using the cf as stressed panels? Should remove the need for a bit of the triangling.
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Syd Bridge
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| posted on 3/8/06 at 10:32 AM |
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If the cfrp is to replace structural members, then he is in for a £ shock. 
Will definitely need some high tec sandwich, with layups taking particular chassis geometry into account.
Be better off to build a cfrp tub to start with, and the job is done properly. Otherwise, it's a 'disaster waiting to happen', at
the very best.
Cheers,
Syd.
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DIY Si
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| posted on 3/8/06 at 10:33 AM |
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Fair enough. I don't know a lot about cf so wasn't sure how possible/expensive it'd be.
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Peteff
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| posted on 3/8/06 at 11:20 AM |
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Does the battery, tank and fuel come into that weight as well?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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cloudy
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| posted on 3/8/06 at 12:36 PM |
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that's an unfuelled weight, I'm hearing of people building BEC 's around 450kg's
taking off the diff, prop shaft and bodywork must result in sub 400kg at the very least!
James
www.warnercars.com
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cloudy
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| posted on 3/8/06 at 12:37 PM |
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ps chassis is just an outline, there's lots of triangulation to be added....
www.warnercars.com
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