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Captbadjim
Joined: 12 Sep 2011
Posts: 13
Location: Bellingham
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 Posted: Fri Oct 12, 2012 2:21 am Post subject: Rod Bearing Bolts |
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Hi All,
I have decided to fix my 1980 924 Turbo from Fairbanks AK. I am sure the rings are bad so I will also replace the rod bearings at the same time. Tha Hanes manual says to replace the rod bearing bolts every time? Is this really necessary? With alot of ring failure in these cars is every one replacing there rod bolts? I have the engine out on a stand getting ready to tear her down, what other mods are recomended? Is there any way to simplify the workings of this motor removing unnecessary emissions controls?
Any help will be appreciated!!
Jim
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11723
Location: PacNW
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| Posted: Fri Oct 12, 2012 2:46 am Post subject: |
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My most hated question on a Porsche tech board:
"Is it really necessary to do what the Porsche Factory Service Manual says? It seems too expensive/too troublesome."
A search will tell you that at least one motor has been lost from rod bolt failure. With the severely limited supply of bearings for these engines, it would be wasteful to go to all that trouble and skip a couple hundred bucks in fasteners, IMO.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Paul
Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
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| Posted: Fri Oct 12, 2012 12:30 pm Post subject: |
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If you can find the pistons, install the 81-82 pistons to raise the compression ratio.
Install the ROW waste gate spring.
Think about an adjustable cam gear (VW part).
If you do this, you will need to use premium gas instead of regular.
Leave the emission controls intact, not much to gain compared to the above.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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Captbadjim
Joined: 12 Sep 2011
Posts: 13
Location: Bellingham
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| Posted: Fri Oct 12, 2012 6:23 pm Post subject: |
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From my searches the rod blots are more rare than the bearings? What am I missing! Does everyone change out the bolts or not when they fix there top ring?
Please
Your help is appreciated.
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Captbadjim |
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WEASEL149
Joined: 19 Aug 2005
Posts: 595
Location: UK, Sheffield
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| Posted: Sat Oct 13, 2012 1:46 am Post subject: |
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| Captbadjim wrote: | From my searches the rod blots are more rare than the bearings? What am I missing! Does everyone change out the bolts or not when they fix there top ring?
Please
Your help is appreciated. |
Rasta is right. It's a huge risk re-using rod bolts as they're one of the most highly stressed components in the whole engine.
The problem is that they're no longer available from Porsche. Someone may have new old stock somewhere but finding it is the problem.
Otherwise, Ideola has organised a number of group-buys for ARP replacement con-rod bolts. These are a special order item and are stronger than the originals.
A minimum of 5 sets need to be bought from ARP and 10 sets brings the price down significantly.
Best thing to do would be to PM/email Ideola and ask, although at the moment he's not answering PM's, maybe because of travelling/work.
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1979 UK 932 |
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Captbadjim
Joined: 12 Sep 2011
Posts: 13
Location: Bellingham
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| Posted: Sun Oct 14, 2012 5:09 am Post subject: |
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Thanks Guess I start my search for rod bolts. All good information. I am sure I will be needing more help In the future.
Again thanks 🔧
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Thu Sep 10, 2015 10:57 pm Post subject: |
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I am self-funding a new round of production on these bolts. See details here: http://www.924board.org/viewtopic.php?t=41557
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erstwhile owner of just about every 924 variant ever made |
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