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914World.com _ 914World Garage _ Redrilling early hubs for 5 lug..

Posted by: bondo Jan 19 2005, 02:54 PM

I got me a set of early hubs. I am redrilling for 5 lugs, and don't want to screw this up. It looks to me that one of the original 4 lug bolt holes will need to become a stud hole, and then the other 4 stud holes will end up on a boss. The thing is the original threaded 4 lug bolt holes are through thicker bosses. Should I just mill down the one I'm using to the same height as the other bosses? Should I mill them all down to the same level? Should I leave it alone and have one stud stick out less?

(I have access to a mill and a degreed rotary table, so I'm not worried about alignment issues)

Posted by: sixnotfour Jan 19 2005, 03:50 PM

They all need a spot face so the stud pulls square. youchoice on the fourth one, Have you looked at Eric's method ? The way to go and you dont have to worry.
http://www.914world.com/bbs2/index.php?act=ST&f=4&t=21671

Posted by: Mueller Jan 19 2005, 03:51 PM

I'd spot face them all to be the same height

Posted by: ! Jan 19 2005, 03:54 PM

"early" hubs have spots for all five studs....they were the same for the 914/6 and the four bangers....you have late hubs.... IPB Image

Not that it's a bad thing...."I" mill them all flat when using the later hubs. Never had one fail. I miked a 911 hub on my 83 and it's within a RCH of the 914 later hubs.....so I wouldn't worry.

Not that I would STOP you from building up the thickness where you plan on drilling...just don't think it's neccessary.

GPR that does a trade in for drilled hubs...does them flat as well...he does a higher volume than I do.... IPB Image

Posted by: bondo Jan 19 2005, 04:14 PM

QUOTE (mikez @ Jan 19 2005, 02:54 PM)

"early" hubs have spots for all five studs....they were the same for the 914/6 and the four bangers....you have late hubs.... IPB Image

These are definitely early hubs. They have raised bosses for the 5 lug pattern. The issue is the raised bosses for the 4 lug pattern are raised more. I need to use one of the 4 lug bosses for the 5 lug pattern. I guess the 4 lug pattern needed more thickness because it was threaded. Does anyone have a pic of the backside of a factory 914/6 hub? It would be interesting to see how the factory handled it, since they supposedly used the same casting for both and just made the holes in different spots.

Posted by: Root_Werks Jan 19 2005, 04:21 PM

The reason the raised area for the 4lug spot is great then for the 5 lug spot is because the 4 lugs are threaded and the 5 lugs are push thru studs. But I always thought they were the same height? Man, it has been a while since I have seen an early hub! IPB Image

Posted by: ! Jan 19 2005, 04:25 PM

OK..if you have five raised spots....mill them even, drill your holes and pull the studs thru. Use longer than stock ones if you have a choice. It allows the use of spacers if you have flares or want to set the wheels out more for a wider stance.

Posted by: bondo Jan 19 2005, 04:26 PM

IPB Image

I'll post pics tonight

Posted by: sixnotfour Jan 19 2005, 06:29 PM

911/914-6 same hub coasre spline . 914-4 early extra bosses fine spline

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Posted by: bondo Jan 19 2005, 07:30 PM

Ok, here's the pics. I think they show pretty well what I'm talking about.

I find it interesting that a 914/6 used a different hub. Does that mean that the 5 lug pattern of bosses was never used by the factory?

Pic 1:

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Posted by: bondo Jan 19 2005, 07:31 PM

Pic 2: (last one)

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Posted by: Eric_Shea Jan 20 2005, 08:35 PM

yup... 5-lug was never used. They used the early 911 hub and a special 914-6 stub axle.