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...

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

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

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]

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

they look rather expensive, what did they cost?

James

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!

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]

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.

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]

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

£10 you don't make 300kg.

quote:

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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]

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think the hub adaptors are about £70.

quote:

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Originally posted by cloudy

gonna need it for all the carbon fibre

James

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quote:

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That chassis needs a few more triangles

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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.

Fair enough. I don't know a lot about cf so wasn't sure how possible/expensive it'd be.

Does the battery, tank and fuel come into that weight as well?

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

ps chassis is just an outline, there's lots of triangulation to be added....