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Post by slimjim on Jan 2, 2022 20:31:35 GMT 12
Hi there I was just wanting to get some direction on changing a factory PCD by means of drilling hubs / drums, as the info i have found is a little grey. This is in regard to the 70’s VW Type 3, which has a drum over hub set up. A common mod for VW’s around the world is to fit Porsche wheels VW wheels are 4x130mm, Porsche wheels are 5x130 Is it acceptable in NZ to have the rear hubs and drums re-drilled? The new studs do come close to the existing holes, as can be seen in the attached pictures.    Many thanks in advance! Slim |
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Post by Chris on Jan 5, 2022 14:02:10 GMT 12
Hi there I was just wanting to get some direction on changing a factory PCD by means of drilling hubs / drums, as the info i have found is a little grey. This is in regard to the 70’s VW Type 3, which has a drum over hub set up. A common mod for VW’s around the world is to fit Porsche wheels VW wheels are 4x130mm, Porsche wheels are 5x130 Is it acceptable in NZ to have the rear hubs and drums re-drilled? The new studs do come close to the existing holes, as can be seen in the attached pictures. <button disabled="" class="c-attachment-insert--linked o-btn--sm">Attachment Deleted</button><button disabled="" class="c-attachment-insert--linked o-btn--sm">Attachment Deleted</button> <button disabled="" class="c-attachment-insert--linked o-btn--sm">Attachment Deleted</button> Many thanks in advance! Slim Hi Slim Wheel hubs can be re-drilled to accommodate a different wheel stud pattern, provided that there is a space of at least one stud hole diameter between any original stud hole and any new stud hole and the sections of vehicle hub which have been drilled for new studs have at least as much material thickness as the original position for the studs. In saying that it is generally not possible to re-drill a vehicle hub for a new configuration of studs (for example from 4-stud to 5-stud), without encountering clearance issues, unless the new PCD is substantially different from OE. It is unlikely that a hub will have a large enough diameter to increase the PCD sufficiently while retaining enough material around the stud. In contrast, any reduction in PCD may reduce the hub’s load-carrying capacity. Some vehicle hubs have recesses or other areas which are not suitable to have a stud fitted to, and studs must not pass through such areas. Looking at the pictures provided, I would say there is less than a stud holes distance between the original stud hole and the closest of the new stud holes. (see attached pic)  If my eye-crometer is correct, this would not meet the requirement. Cheers Chris |
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Post by slimjim on Jan 11, 2022 19:19:18 GMT 12
Thats fantastic Chris - thanks very much for you time!
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Post by slimjim on Apr 23, 2023 22:21:43 GMT 12
Hi again Chris, Just wanting to tease this out a little more if I can?.. I get what you are saying regarding the hubs loosing strength being re drilled with a second stud patten.. I have found company who manufacturer hubs with purely the 5x130 bolt pattern, rather than re drilling the standard 4 stud hubs to five, weakening it due to the close holes.. These also have screw holes to screw the drum to the hub..  This would mean that only the drum (that goes over the hub and is clamped down to the hub by the wheel rim - and fixing screws) would need re drilling with the bolt holes closer than a hole diameter.. The hub itself will still be as strong as oem  Would this be an acceptable way of doing this conversion? Many thanks again, Slim |
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Post by Chris on Apr 27, 2023 14:42:24 GMT 12
Hi again Chris, Just wanting to tease this out a little more if I can?.. I get what you are saying regarding the hubs loosing strength being re drilled with a second stud patten.. I have found company who manufacturer hubs with purely the 5x130 bolt pattern, rather than re drilling the standard 4 stud hubs to five, weakening it due to the close holes.. These also have screw holes to screw the drum to the hub.. This would mean that only the drum (that goes over the hub and is clamped down to the hub by the wheel rim - and fixing screws) would need re drilling with the bolt holes closer than a hole diameter.. The hub itself will still be as strong as oem Would this be an acceptable way of doing this conversion? Many thanks again, Slim Hi Slim Assuming the hub is made of suitable material and all other requirements are met, the wheel bolts holes in the drum are not as critical to transmit the braking force, this is usually through the clamping force of the wheel. This would mean a pair of holes closer than a stud diameter apart could be accepted. Hope that helps Chris |
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Post by slimjim on Apr 30, 2023 21:11:55 GMT 12
Thats fantastic!
Once again, thanks for your guidance Chris!
Cheers
Slim
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