 knowledge about struts |
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| 914andy |
 Jun 25 2021, 10:09 AM
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#1
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Member  Group: Members Posts: 59 Joined: 23-December 11 From: Nashville tn Member No.: 13,929 Region Association: None 
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Looking for a memory refresh on the difference between Koni strut and a bilstien strut.
I have a set of Koni 3.5 " struts. Is the actual tube diameter bigger on the Koni? thanks Andy |
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| 914Sixer |
Jun 25 2021, 11:37 AM
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#2
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Thinking they are all the same size.
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| horizontally-opposed |
Jun 25 2021, 12:12 PM
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#3
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Advanced Member Group: Members Posts: 3,432 Joined: 12-May 04 From: San Francisco Member No.: 2,058 Region Association: None
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Diameter on all Konis should be the same?
3.5 or 3.0 usually refers to the bolt spacing for the brake caliper mount. |
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| mepstein |
Jun 25 2021, 12:46 PM
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#4
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(horizontally-opposed @ Jun 25 2021, 02:12 PM)  Diameter on all Konis should be the same? 3.5 or 3.0 usually refers to the bolt spacing for the brake caliper mount. (IMG:style_emoticons/default/agree.gif) Koni takes a koni insert Bilstein takes a bilstein insert Boge takes a boge, bilstein or koni insert (as long as its the proper model insert) |
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| 914andy |
Jun 25 2021, 06:58 PM
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#5
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Member Group: Members Posts: 59 Joined: 23-December 11 From: Nashville tn Member No.: 13,929 Region Association: None
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QUOTE(mepstein @ Jun 25 2021, 01:46 PM) QUOTE(horizontally-opposed @ Jun 25 2021, 02:12 PM) Diameter on all Konis should be the same? 3.5 or 3.0 usually refers to the bolt spacing for the brake caliper mount. (IMG:style_emoticons/default/agree.gif) Koni takes a koni insert Bilstein takes a bilstein insert Boge takes a boge, bilstein or koni insert (as long as its the proper model insert) Thats what I remember...I guess I just never knew the reason. Andy |
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| Superhawk996 |
Jun 25 2021, 09:31 PM
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#6
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914 Guru Group: Members Posts: 5,824 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Hmm. Maybe I’m misunderstanding.
Bilstein struts are actually an inverted mono tube that reduces unsprung weight to a limited degree. Very different design than Koni or Boge. Bilstein struts have relative motion between the strut insert and the strut body, guided by linear bearings. Very similar to a motorcycle fork motion. Strut insert body diameter is larger on Bilsterin since it essentially is almost the same size as the strut body it slides within. I don’t have parts in front of me but I think all three have esentially the same strut body tube diameter as stated above. Bending forces on Bilstein are borne by the strut insert body. Koni and Boge bending forces are borne by the strut damping rod. Koni strut dampers are twin tube design. If I recall Boge are twin tube dampers also. Mono tubes typically are lighter, cool better, and have better damping characteristics than twin tube dampers. Sorry if I’m missing the point of the original question. |
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| 914andy |
Jun 26 2021, 06:54 AM
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#7
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Member Group: Members Posts: 59 Joined: 23-December 11 From: Nashville tn Member No.: 13,929 Region Association: None
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this falls under why ask why....whats the difference between a Boge strut that accepts Koni or Bilstien and say a Koni strut that only accepts Koni.
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| davep |
Jun 26 2021, 03:20 PM
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#8
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914 Historian Group: Benefactors Posts: 5,143 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
Koni struts are designed for Koni inserts and Bilstein struts are designed for Bilstein inserts. In both cases I don't know of another supplier making parts to fit. Boge struts are designed for Boge inserts, but both Koni & Bilstein make inserts that will fit; I'm sure there are other suppliers that make inserts that fit as well. But in any case, the inserts are designed specifically for the strut. So a Koni insert for a Koni strut will not fit a Boge strut.
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| bbrock |
Jun 27 2021, 07:56 AM
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#9
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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QUOTE(davep @ Jun 26 2021, 02:20 PM) Koni struts are designed for Koni inserts and Bilstein struts are designed for Bilstein inserts. In both cases I don't know of another supplier making parts to fit. Boge struts are designed for Boge inserts, but both Koni & Bilstein make inserts that will fit; I'm sure there are other suppliers that make inserts that fit as well. But in any case, the inserts are designed specifically for the strut. So a Koni insert for a Koni strut will not fit a Boge strut. (IMG:style_emoticons/default/agree.gif) If you search the Bilstein catalog for 914 (even 914/6), you will find inserts for only Boge struts. But if you search for 911, you find inserts for either Boge or Bilstein struts. The cartridges look very different. I have Bilstein in my Boge struts and they dropped right in. |
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