 Identifying 911 Struts, what are the pertinent factors |
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| McMark |
 Aug 17 2006, 06:46 PM
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914 Freak!  Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None  |
I'm sure the struts on the 911 was exactly the same for a long time. Various hubs bolted on the strut would give you various back spacings, etc. What I'm curious about is if someone had say, four 911 struts, what measurements are pertinent to decide what is compatible and what is not?
1. Caliper Bolt Spacing is an obvious first measurement. Beyond that, are there different wheel bearing diameters? Different spindle lengths? What about determining which shocks will work and which wont? |
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| lapuwali |
Aug 17 2006, 06:53 PM
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743  |
QUOTE(McMark @ Aug 17 2006, 05:46 PM)  I'm sure the struts on the 911 was exactly the same for a long time. Various hubs bolted on the strut would give you various back spacings, etc. What I'm curious about is if someone had say, four 911 struts, what measurements are pertinent to decide what is compatible and what is not? 1. Caliper Bolt Spacing is an obvious first measurement. Beyond that, are there different wheel bearing diameters? Different spindle lengths? What about determining which shocks will work and which wont? Caliper bolt spacing actually doesn't always work, as M struts have the same 3" spacing as 914 struts. Spindle diameter is different, however. I *think* the 911 spindles are larger in diameter than 914 spindles, but I don't know the actual figures. Pre-69 911 struts are also very different from 69 and later, as the balljoint attaches in a completely different way (not just the pinch bolt v. wedge pin difference that appeared in 72-73). |
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| Eric_Shea |
Aug 17 2006, 07:07 PM
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
Spindles are fatter on 911 struts.
Check the ball joint attachment at the base. That will give you a clue to the year. Slot is pre-71 on a 911. 3" will be T struts (in general) and will be Boge. They will have a coarse thread pattern for the inserts. Brad's given the run-down on what fits in there (everything basically). 3.5" Koni struts will generally be orange but could have been repainted etc. They will have a finer thread and only Koni inserts fit. 3.5" Bilstein will generally be green and will fit a Bilstein insert only. Early struts or more over early "hubs" are designed with a different offset (about 5mm in) that holds solid rotors. They won't line up properly on vented calipers. Look out for that. What else?? (IMG:style_emoticons/default/confused24.gif) |
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| TimT |
Aug 17 2006, 07:54 PM
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
Bilstien have a roll pin on the bottom that hold the strut
Boge/koni have treaded collars on top early struts have fine threads for the clamp nuts, later struts are coarse thread early early struts (all) have a different attachment method for the ball joints the bearing diameter are the same for all the offset is different among other things |
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