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I did some material analysis of the valve using X-ray fluorescence. This shows that it is primarily Inconel, 73% Nickel, 19% Chromium, 2% Titanium 1.5% aluminum (could be surface contaminant) 1.5% iron......
I suspect the Porsche valve guide is made of beryllium copper. The replacement I am having made will be made of a precipitate hardened copper nickel silicon alloy. You can Google Colsibro, that is one of the many examples of this alloy.
David
Old 11-28-2017, 07:50 AM
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The guide is a press fit in the housing, and may need to be reamed after pressing it in. I am going to try to do a thermal fit on my first rebuild unit. I will heat the cast iron housing to 300 deg F and freeze a guide in liquid nitrogen. It should drop right in place.
Old 11-28-2017, 07:55 AM
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How far are you? I currently have no problems with the wastegate but I want to put a kit of you in stock.
Old 12-02-2017, 09:30 PM
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Wastegate

Hi David, how are you getting on with this ? I would like to order a kit if thatís ok.
Stan.
Old 12-14-2017, 07:36 AM
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I expected to receive the valve guides last week, but have not gotten them yet. I have been working more overtime than usual so have not bothered to call the vendor. I will call tomorrow and check on status.
I have possibly had enough people contact my via PM to sell out the first run of parts. If that is the case I will reorder in larger quantities for a second batch. I think that everyone with a 930 will need these parts one day. It's surprising I seem to be the only one making them.
David
Old 12-14-2017, 01:00 PM
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Ok, finally got the new valve guides in. I just got them out of the box tonight. I will measure and compare critical dimensions tomorrow. I will work toward getting a wastegate built up next week. I would be interested in loaning out a rebuilt wastegate for testing and evaluation. If your interested in providing testing services please PM me with your personal test plan.

Last edited by reclino; 01-17-2018 at 04:20 PM..
Old 01-17-2018, 03:25 PM
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Measurements of the valve guide look good. I started working up a packaging strategy tonight. Just a few more days before being able to ship. Would everyone who has already contacted my via PM please confirm your still interested and send me your shipping info. I want to check on the best way to ship these out, I am guessing US postal flat rate small box would work.
If everyone who has already contacted me about the kits follows through and pays then the first run of kits will sell out. I will double my order of parts for the next run.
Thanks
David
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Last edited by reclino; 01-21-2018 at 04:33 PM..
Old 01-21-2018, 04:31 PM
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I do have some extra shims and gaskets, but do not have any extra valve guides for this first run of parts. Extra gaskets cost $17.00, extra shims cost $7.25 each.
thanks
David
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Old 01-21-2018, 04:58 PM
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The wastegate housing is in the oven at 450 deg F and one of the new valve guides is in the freezer at -1 deg F. If my calculations are correct the guide should drop right in!
Old 01-23-2018, 06:56 PM
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Old 01-23-2018, 06:58 PM
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Calculations were correct! The valve guide slid right into place with zero effort.
David
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Old 01-23-2018, 07:55 PM
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Old 01-23-2018, 07:56 PM
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A bit left field.....

However, how long would anyone expect a wastegate to last ?

And how do you know it has passed its used by date ?
Old 01-24-2018, 12:33 AM
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Did you come up with a replacement diaphragm?
I have a good spare wastegate, but it needs one if you have them available.
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Old 01-24-2018, 03:21 AM
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Engineers can make the world go round!!
Old 01-24-2018, 05:39 AM
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I have not focussed on replacement diaphragms yet. I will work on that once these parts are running smoothly. I believe the initial tooling cost will be higher as custom molds will be required. With enough volume per part costs should be reasonable.
David
Old 01-24-2018, 10:15 AM
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Dave, really great work, wish I would have seen this thread earlier.

Two things:
1. I am in urgent need of the asbestos gasket for one of my projects. Do you have any left?
2. I would love to resell your kit on Ideola's Garage. Let's discuss!
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Old 03-31-2018, 07:18 AM
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I was looking at Patrick Racing on line catalog the other day and found that they list a replacement wastegate diaphragm for Porsche wastegates. P/N 930-123-210-PMP, lists for $140. It says they are a Patrick Racing Mororsports exclusive. I wonder if they had these made and if they have them in stock?
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Old 04-01-2018, 11:07 AM
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Patrick Motorsport never returns my inquiries. Email, online form, or phone calls.
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Old 04-01-2018, 07:24 PM
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Just spoke with the guys at Patrick, they said the diaphragms are in stock, should be no shortage of supply on them.
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
Old 04-02-2018, 09:43 AM
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