Yet another 5-lug rear conversion, some questions |
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Yet another 5-lug rear conversion, some questions |
TonyAKAVW |
May 23 2009, 09:42 PM
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#1
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That's my ride. Group: Members Posts: 2,151 Joined: 17-January 03 From: Redondo Beach, CA Member No.: 166 Region Association: None |
I've been reading up on lots of threads about the rear conversion, CV joints, etc. etc. I'm not 100% clear on everything, but more importantly I'm not exactly sure what I have...
A few years ago I picked up a roller that was in the early stages of a -6 conversion. The owner worked at a Porsche shop here in socal, and had put a 1987 SC front end on the car, and started to do the 5-lug rear conversion. So what I have are a pair of trailing arms with some stuff installed. From what I can tell from the other threads, I have a 74+ hubcentric wheel flange, early 911 stub axles, and on one of the trailing arms, a partially complete 911 handbrake. The other trailing arm has the dust shield portion installed, but no shoes, etc. The stub axle flanges measure 100 mm across in total diameter (edge to edge). Now for the questions: 1. There were several threads about spacers required for the hubcentric wheel flanges, but I couldn't figure out where these spacers are supposed to go. Second, is there a way I can tell if this setup has them or not? 2. I'm hoping to use the 944 CV joints, 914 axle, and 911 coarse splined output flanges. Based on what I have are there any issues? 3. Brakes. I currently have the A calipers on the front and stock 914 rear calipers. When I finish this rear 5-lug conversion I will have to choose between upgrading the rears to the V-calipers or moving my A calipers to the rear, and using Boxster calipers on the front. As far as I can tell, there is little to convince me to go with the V-caliper. A set of Boxster calipers is ~$300 off ebay, and I figure I should be able to make a set of adapters on my milling machine. The V-calipers are nearly $600 and offer no change in pad size on the rear. I realize that fora narrow bodied car, the setup I'm proposing is overkill, but if in the future I decide to flare, I'd have the brakes already done. I have a 165 HP Subaru motor, and I'm sitting at about 1900 lb right now, with some weight still to come off. So the question here is any suggestions/opinions? 4. If I do put the A calipers on the back, are they strictly bolt-on or will I need to modify anything? -Tony Attached image(s) |
charliew |
May 26 2009, 08:54 AM
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#2
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Advanced Member Group: Members Posts: 2,363 Joined: 31-July 07 From: Crawford, TX. Member No.: 7,958 |
Brads thread, boxter parts look a little familiar?
http://www.914club.com/bbs2/index.php?show...emergency+brake Also I have both the 911 early shoes and the 944 versions and they are pretty much interchangeable on the backing plate, you might need to drill a coupla holes in the plate. In the case of the boxter, the shoes look narrower, But they are probably the right size for the lighter car. Of course you still gotta do the support/rubbing block deal on the 914 casting. And on the boxter I don't think the backing plate will fit on the 914 casting but it might. |
Wes V |
May 26 2009, 09:29 AM
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#3
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Member Group: Members Posts: 482 Joined: 11-October 07 From: Los angeles Member No.: 8,211 |
Charliew; (and others)
Just a word of caution; be careful about repeating stuff that Brad posts. (not to start a cross-site war!) In that string he posts up a bunch of photos and aludes to the fact that it should work. If it was as straight forward as he would have you think, he would already be selling a kit. The photos are worth looking at, but be careful on how you read what he says. (for the record, I've been visiting both sites for about a year and a half and this is the first time I've done brad-bashing) Wes V |
davesprinkle |
May 26 2009, 07:51 PM
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#4
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Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None |
Charliew; (and others) Just a word of caution; be careful about repeating stuff that Brad posts. (not to start a cross-site war!) In that string he posts up a bunch of photos and aludes to the fact that it should work. If it was as straight forward as he would have you think, he would already be selling a kit. The photos are worth looking at, but be careful on how you read what he says. (for the record, I've been visiting both sites for about a year and a half and this is the first time I've done brad-bashing) Wes V In Brad's defense, he's mostly focused on Boxster stuff right now. He loves 914s, but his priorities have recently shifted to making a living. So the lack of a kit shouldn't infer anything regarding suitability. As I mentioned, BR just hasn't had the time to look at this in depth. I suspect (without having seen the pieces in person) that there will be enough advantages to the Boxster setup to make it a worthwhile pursuit. At the very least, it will be as functional as using any of the other, similarly designed (ie. 944), angle-pull spreaders. On a slightly related topic, in the same thread, BR alluded to the Boxster's use of the 914 rear wheel bearing and suggested that as a result of this, the Boxster hubs and stubs would work in a 914 trailing arm. Intriguing. Seductive, even. A new option to be added to the Rear Hub Conversion Parts Matrix? Anybody have any comments? |
Richard Casto |
May 26 2009, 11:24 PM
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#5
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Blue Sky Motorsports, LLC Group: Members Posts: 1,465 Joined: 2-August 05 From: Durham, NC Member No.: 4,523 Region Association: South East States |
On a slightly related topic, in the same thread, BR alluded to the Boxster's use of the 914 rear wheel bearing and suggested that as a result of this, the Boxster hubs and stubs would work in a 914 trailing arm. Intriguing. Seductive, even. A new option to be added to the Rear Hub Conversion Parts Matrix? Anybody have any comments? If the Boxster uses the same wheel bearing, that means the OD and length of the mating surface on the hub is the same as the 914. Questions that remain are... 1. How far out is the hub mounting surface? Point being can you mount a rotor to it and still have it centered on the caliper correctly? If so, it might be an improvement over the 911 hub-centric hubs which require the custom 5mm spacer. 2. What is the spline count and diameter inside the hub? Or another way of saying this, what stub axle will work with that hub? Will only the Boxster stub axle work, or will others? 3. If only the Boxster stub axle works, then what is the CV joint situation with the Boxster stub axle? Unless the Boxster stuff is cheaper than the current options, I am not sure what it will do to help. (IMG:style_emoticons/default/confused24.gif) But I think it's something worth researching. One last thing to mention. Brad may know something beyond what is listed in PET, but I just looked up the part number for the 986 and 987 and as far as I can tell they list a different part number for the bearing than they do for the 914. Frankly I would be suprised if they used the 914 bearing. They increased the bearing size in later cars (probably due to load from increased weight and performance of the newer cars) and I would not expect them to go backwards with the Boxster. But I don't know any more than what I can see in PET. |
davesprinkle |
May 27 2009, 11:34 PM
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#6
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Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None |
What is the spline count and diameter inside the hub? Or another way of saying this, what stub axle will work with that hub? Will only the Boxster stub axle work, or will others? If only the Boxster stub axle works, then what is the CV joint situation with the Boxster stub axle? BR indicated that the Boxster stub-axle and outboard CV are one piece and are non-serviceable. Meaning that the Boxster stub-axle is a likely a dead-end for 914 driveline conversion, at least as far as a bolt-up solution is concerned. |
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