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Registered
Join Date: Jul 2005
Location: Yorkshire UK
Posts: 1,097
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915 Diff Help Needed
Im in the process of converting my car to a G50 tranny and im looking at options for my drive shafts. My early 4 bolt shafts fit the flanges of the G50 perfectly matching up on 4 of the bolts with the other bolt holes lining up with the roll pins. It seems to me the easiest option rather than changing the entire shafts and to hubs to G50 type just to either drill out the roll pins on my inner CV joints thus adding the 2 extra bolt holes or making the holes in the flanges a little wider to accept the early roll pins. The only problem I can see is if the flanges on the G50 are further apart which would mean the shafts would be the wrong length. Does anyone have a 915 diff and pair of flanges laying around that they could measure the difference from flange front to flange front for me?
Thanks Steve R
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1972 911t RS Styled G50 conversion underway 1972t Resto Project - http://www.ddk-online.com/phpBB2/viewtopic.php?t=16695 |
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06-09-2006, 12:07 PM
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Join Date: Mar 2005
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Hello Steve.
They are the same. The " roll pins" are actaully called Spirols..they are a spiral rather than just a c shape, and their functiopn is different..they put much more metal into the shear plane.. The good news is the do not need drilling..they just drive out with a light sprung interference fit. The not so good news is you will need to carefully check the lenghth and diameter of the new Allen bolts , and be very fussy about the internal condition of the CVJ's, their lube needs to be expensive quality stuff , fresh, and good boots... The Spirol pins holes are differnet from the Allen bolt holes...you may need to et the output flanges machined to take 10mm bolts..four 8mm will not suffice IMHO..if, if, that is what is in the g50 you have... Kind regards David |
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06-09-2006, 01:56 PM
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Location: Yorkshire UK
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I will probably drill the CV joint to take 2 extra bolts then sleave the holes in my joints to take the same size bolts as the flanges, im sure extra bolts in this area is better than fewer thicker bolts.
Steve
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1972 911t RS Styled G50 conversion underway 1972t Resto Project - http://www.ddk-online.com/phpBB2/viewtopic.php?t=16695 |
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06-09-2006, 02:17 PM
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Join Date: Mar 2005
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Hello Steve.
You may find it a ''challenge' to drill the cvj..its extremely hardened steel! If you check the tables, you may find that the four 10mm 12.2nm bolts provides more clamping pressure then six 8mm do, surprisingly...and the Spirols are a significant bonus.. The later set up was probably financial rather than engineering decision. Like most stuff at Porsche after about 1973... Kind regards David |
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06-09-2006, 03:10 PM
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